Merge tag 'leds-next-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds

Pull LED updates from Lee Jones: - Allow struct bin_attribute instances to be placed in read-only memory for enhanced protection - Fix a memory leak in the cht-wcove driver by using devm_led_classdev_register() - Fix an OF node reference leak in the netxbig driver - Ensure PWM is disabled properly in pwm-multicolor suspend - Add support for Texas Instruments LP8864, LP8864S, LP8866 LED-backlight drivers - Add support for STMicroelectronics's LED1202 12-channel LED driver - Convert LP8860 bindings to YAML format - Add bindings for the TI LP8864/LP8866 LED drivers - Add LED1202 LED controller bindings - Fix path to color definitions in leds-class-multicolor.yaml - Add pm660l compatible to qcom,spmi-flash-led bindings - Extend cznic,turris-omnia-leds binding with interrupts property - Add documentation for the STMicroelectronics LED1202 driver - Add entry for AAEON UP board FPGA drivers in MAINTAINERS - Fix a wrong format specifier in the ledtrig-activity driver - Fix a bug in the lp8860 driver where only half of the EEPROM was written * tag 'leds-next-6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds: (28 commits) leds: triggers: Constify 'struct bin_attribute' leds: cht-wcove: Use devm_led_classdev_register() to avoid memory leak leds: lp8864: Add support for Texas Instruments LP8864, LP8864S, LP8866 LED-backlights dt-bindings: leds: Convert LP8860 into YAML format leds: Add LED1202 I2C driver dt-bindings: leds: Add LED1202 LED Controller Documentation:leds: Add leds-st1202.rst leds: pwm-multicolor: Disable PWM when going to suspend leds: netxbig: Fix an OF node reference leak in netxbig_leds_get_of_pdata() turris-omnia-mcu-interface.h: Move macro definitions outside of enums MAINTAINERS: Add entry for AAEON UP board FPGA drivers leds: Add AAEON UP board LED driver leds: trigger: netdev: Check offload ability on interface up leds: turris-omnia: Use uppercase first letter in all comments leds: turris-omnia: Use dev_err_probe() where appropriate leds: turris-omnia: Inform about missing LED gamma correction feature in the MCU driver platform: cznic: turris-omnia-mcu: Inform about missing LED panel brightness change interrupt feature leds: turris-omnia: Notify sysfs on MCU global LEDs brightness change leds: turris-omnia: Document driver private structures dt-bindings: leds: cznic,turris-omnia-leds: Allow interrupts property ...
2026-03-06 15:25:10 -08:00 · 2025-01-22 09:19:36 -08:00
parent 909fd2b89f daefd7fbd5
commit 11a7b03346
23 changed files with 902 additions and 364 deletions
--- a/Documentation/devicetree/bindings/leds/cznic,turris-omnia-leds.yaml
+++ b/Documentation/devicetree/bindings/leds/cznic,turris-omnia-leds.yaml
@@ -23,6 +23,12 @@ properties:
    description: I2C slave address of the microcontroller.
    maxItems: 1

+  interrupts:
+    description:
+      Specifier for the global LED brightness changed by front button press
+      interrupt.
+    maxItems: 1
+
  "#address-cells":
    const: 1

@@ -56,6 +62,7 @@ additionalProperties: false
 examples:
  - |

+    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/leds/common.h>

    i2c {
@@ -65,6 +72,7 @@ examples:
        led-controller@2b {
            compatible = "cznic,turris-omnia-leds";
            reg = <0x2b>;
+            interrupts-extended = <&mcu 11 IRQ_TYPE_NONE>;
            #address-cells = <1>;
            #size-cells = <0>;

--- a/Documentation/devicetree/bindings/leds/leds-class-multicolor.yaml
+++ b/Documentation/devicetree/bindings/leds/leds-class-multicolor.yaml
@@ -27,7 +27,7 @@ properties:
    description: |
      For multicolor LED support this property should be defined as either
      LED_COLOR_ID_RGB or LED_COLOR_ID_MULTI which can be found in
-      include/linux/leds/common.h.
+      include/dt-bindings/leds/common.h.
    enum: [ 8, 9 ]

 required:
--- a/Documentation/devicetree/bindings/leds/leds-lp8860.txt
+++ b/Documentation/devicetree/bindings/leds/leds-lp8860.txt
@@ -1,50 +0,0 @@
-* Texas Instruments - lp8860 4-Channel LED Driver
-
-The LP8860-Q1 is an high-efficiency LED
-driver with boost controller. It has 4 high-precision
-current sinks that can be controlled by a PWM input
-signal, a SPI/I2C master, or both.
-
-Required properties:
-	- compatible :
-		"ti,lp8860"
-	- reg : I2C slave address
-	- #address-cells : 1
-	- #size-cells : 0
-
-Optional properties:
-	- enable-gpios : gpio pin to enable (active high)/disable the device.
-	- vled-supply : LED supply
-
-Required child properties:
-	- reg : 0
-
-Optional child properties:
-	- function : see Documentation/devicetree/bindings/leds/common.txt
-	- color : see Documentation/devicetree/bindings/leds/common.txt
-	- label : see Documentation/devicetree/bindings/leds/common.txt (deprecated)
-	- linux,default-trigger :
-	   see Documentation/devicetree/bindings/leds/common.txt
-
-Example:
-
-#include <dt-bindings/leds/common.h>
-
-led-controller@2d {
-	compatible = "ti,lp8860";
-	#address-cells = <1>;
-	#size-cells = <0>;
-	reg = <0x2d>;
-	enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
-	vled-supply = <&vbatt>;
-
-	led@0 {
-		reg = <0>;
-		function = LED_FUNCTION_BACKLIGHT;
-		color = <LED_COLOR_ID_WHITE>;
-		linux,default-trigger = "backlight";
-	};
-}
-
-For more product information please see the link below:
-https://www.ti.com/product/lp8860-q1
--- a/Documentation/devicetree/bindings/leds/qcom,spmi-flash-led.yaml
+++ b/Documentation/devicetree/bindings/leds/qcom,spmi-flash-led.yaml
@@ -23,6 +23,7 @@ properties:
    items:
      - enum:
          - qcom,pm6150l-flash-led
+          - qcom,pm660l-flash-led
          - qcom,pm8150c-flash-led
          - qcom,pm8150l-flash-led
          - qcom,pm8350c-flash-led
--- a/Documentation/devicetree/bindings/leds/ti,lp8860.yaml
+++ b/Documentation/devicetree/bindings/leds/ti,lp8860.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/ti,lp8860.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments - lp8860 4-Channel LED Driver
+
+maintainers:
+  - Andrew Davis <afd@ti.com>
+
+description: |
+  The LP8860-Q1 is an high-efficiency LED driver with boost controller.
+  It has 4 high-precision current sinks that can be controlled by a PWM input
+  signal, a SPI/I2C master, or both.
+
+  For more product information please see the link below:
+    https://www.ti.com/product/lp8860-q1
+
+properties:
+  compatible:
+    const: ti,lp8860
+
+  reg:
+    maxItems: 1
+    description: I2C slave address
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  enable-gpios:
+    maxItems: 1
+    description: GPIO pin to enable (active high) / disable the device
+
+  vled-supply:
+    description: LED supply
+
+patternProperties:
+  "^led(@[0-3])?$":
+    type: object
+    $ref: common.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        description:
+          Index of the LED.
+        maxItems: 1
+
+      function: true
+      color: true
+      label: true
+      linux,default-trigger: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        led-controller@2d {
+            compatible = "ti,lp8860";
+            #address-cells = <1>;
+            #size-cells = <0>;
+            reg = <0x2d>;
+            enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+            vled-supply = <&vbatt>;
+
+            led@0 {
+                reg = <0>;
+                function = LED_FUNCTION_BACKLIGHT;
+                color = <LED_COLOR_ID_WHITE>;
+                linux,default-trigger = "backlight";
+            };
+        };
+    };
+
+...
--- a/15
+++ b/15
@@ -185,6 +185,14 @@ W:	http://www.adaptec.com/
 F:	Documentation/scsi/aacraid.rst
 F:	drivers/scsi/aacraid/

+AAEON UPBOARD FPGA MFD DRIVER
+M:	Thomas Richard <thomas.richard@bootlin.com>
+S:	Maintained
+F:	drivers/leds/leds-upboard.c
+F:	drivers/mfd/upboard-fpga.c
+F:	drivers/pinctrl/pinctrl-upboard.c
+F:	include/linux/mfd/upboard-fpga.h
+
 AB8500 BATTERY AND CHARGER DRIVERS
 M:	Linus Walleij <linus.walleij@linaro.org>
 F:	Documentation/devicetree/bindings/power/supply/*ab8500*
@@ -23293,6 +23301,13 @@ S:	Supported
 F:	Documentation/devicetree/bindings/iio/dac/ti,dac7612.yaml
 F:	drivers/iio/dac/ti-dac7612.c

+TEXAS INSTRUMENTS' LB8864 LED BACKLIGHT DRIVER
+M:	Alexander Sverdlin <alexander.sverdlin@siemens.com>
+L:	linux-leds@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/leds/backlight/ti,lp8864.yaml
+F:	drivers/leds/leds-lp8864.c
+
 TEXAS INSTRUMENTS' SYSTEM CONTROL INTERFACE (TISCI) PROTOCOL DRIVER
 M:	Nishanth Menon <nm@ti.com>
 M:	Tero Kristo <kristo@kernel.org>
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -217,6 +217,8 @@ config LEDS_TURRIS_OMNIA
 	depends on I2C
 	depends on MACH_ARMADA_38X || COMPILE_TEST
 	depends on OF
+	depends on TURRIS_OMNIA_MCU
+	depends on TURRIS_OMNIA_MCU_GPIO
 	select LEDS_TRIGGERS
 	help
 	  This option enables basic support for the LEDs found on the front
@@ -511,6 +513,18 @@ config LEDS_LP8860
 	  on the LP8860 4 channel LED driver using the I2C communication
 	  bus.

+config LEDS_LP8864
+	tristate "LED support for the TI LP8864/LP8866 4/6 channel LED drivers"
+	depends on LEDS_CLASS && I2C && OF
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the TI LP8864-Q1,
+	  LP8864S-Q1, LP8866-Q1, LP8866S-Q1 4/6 channel LED backlight
+	  drivers with I2C interface.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called leds-lp8864.
+
 config LEDS_CLEVO_MAIL
 	tristate "Mail LED on Clevo notebook"
 	depends on LEDS_CLASS && BROKEN
@@ -826,6 +840,15 @@ config LEDS_SC27XX_BLTC
 	  This driver can also be built as a module. If so the module will be
 	  called leds-sc27xx-bltc.

+config LEDS_UPBOARD
+	tristate "LED support for the UP board"
+	depends on LEDS_CLASS && MFD_UPBOARD_FPGA
+	help
+	  This option enables support for the UP board LEDs.
+
+	  This driver can also be built as a module. If so the module will be
+	  called leds-upboard.
+
 comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"

 config LEDS_BLINKM
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_LEDS_LP55XX_COMMON)	+= leds-lp55xx-common.o
 obj-$(CONFIG_LEDS_LP8501)		+= leds-lp8501.o
 obj-$(CONFIG_LEDS_LP8788)		+= leds-lp8788.o
 obj-$(CONFIG_LEDS_LP8860)		+= leds-lp8860.o
+obj-$(CONFIG_LEDS_LP8864)		+= leds-lp8864.o
 obj-$(CONFIG_LEDS_LT3593)		+= leds-lt3593.o
 obj-$(CONFIG_LEDS_MAX5970)		+= leds-max5970.o
 obj-$(CONFIG_LEDS_MAX77650)		+= leds-max77650.o
@@ -82,6 +83,7 @@ obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o
 obj-$(CONFIG_LEDS_QNAP_MCU)		+= leds-qnap-mcu.o
 obj-$(CONFIG_LEDS_REGULATOR)		+= leds-regulator.o
 obj-$(CONFIG_LEDS_SC27XX_BLTC)		+= leds-sc27xx-bltc.o
+obj-$(CONFIG_LEDS_ST1202)		+= leds-st1202.o
 obj-$(CONFIG_LEDS_SUN50I_A100)		+= leds-sun50i-a100.o
 obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
 obj-$(CONFIG_LEDS_SYSCON)		+= leds-syscon.o
@@ -90,6 +92,7 @@ obj-$(CONFIG_LEDS_TI_LMU_COMMON)	+= leds-ti-lmu-common.o
 obj-$(CONFIG_LEDS_TLC591XX)		+= leds-tlc591xx.o
 obj-$(CONFIG_LEDS_TPS6105X)		+= leds-tps6105x.o
 obj-$(CONFIG_LEDS_TURRIS_OMNIA)		+= leds-turris-omnia.o
+obj-$(CONFIG_LEDS_UPBOARD)		+= leds-upboard.o
 obj-$(CONFIG_LEDS_WM831X_STATUS)	+= leds-wm831x-status.o
 obj-$(CONFIG_LEDS_WM8350)		+= leds-wm8350.o
 obj-$(CONFIG_LEDS_WRAP)			+= leds-wrap.o
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -85,13 +85,13 @@ static ssize_t max_brightness_show(struct device *dev,
 static DEVICE_ATTR_RO(max_brightness);

 #ifdef CONFIG_LEDS_TRIGGERS
-static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
-static struct bin_attribute *led_trigger_bin_attrs[] = {
+static const BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
+static const struct bin_attribute *const led_trigger_bin_attrs[] = {
 	&bin_attr_trigger,
 	NULL,
 };
 static const struct attribute_group led_trigger_group = {
-	.bin_attrs = led_trigger_bin_attrs,
+	.bin_attrs_new = led_trigger_bin_attrs,
 };
 #endif

--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -34,7 +34,7 @@ trigger_relevant(struct led_classdev *led_cdev, struct led_trigger *trig)
 }

 ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
-			  struct bin_attribute *bin_attr, char *buf,
+			  const struct bin_attribute *bin_attr, char *buf,
 			  loff_t pos, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -123,7 +123,7 @@ static int led_trigger_format(char *buf, size_t size,
 * copy it.
 */
 ssize_t led_trigger_read(struct file *filp, struct kobject *kobj,
-			struct bin_attribute *attr, char *buf,
+			const struct bin_attribute *attr, char *buf,
 			loff_t pos, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
--- a/drivers/leds/leds-cht-wcove.c
+++ b/drivers/leds/leds-cht-wcove.c
@@ -394,7 +394,7 @@ static int cht_wc_leds_probe(struct platform_device *pdev)
 		led->cdev.pattern_clear = cht_wc_leds_pattern_clear;
 		led->cdev.max_brightness = 255;

-		ret = led_classdev_register(&pdev->dev, &led->cdev);
+		ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
 		if (ret < 0)
 			return ret;
 	}
@@ -406,10 +406,6 @@ static int cht_wc_leds_probe(struct platform_device *pdev)
 static void cht_wc_leds_remove(struct platform_device *pdev)
 {
 	struct cht_wc_leds *leds = platform_get_drvdata(pdev);
-	int i;
-
-	for (i = 0; i < CHT_WC_LED_COUNT; i++)
-		led_classdev_unregister(&leds->leds[i].cdev);

 	/* Restore LED1 regs if hw-control was active else leave LED1 off */
 	if (!(leds->led1_initial_regs.ctrl & CHT_WC_LED1_SWCTL))
--- a/drivers/leds/leds-lp8860.c
+++ b/drivers/leds/leds-lp8860.c
@@ -265,7 +265,7 @@ static int lp8860_init(struct lp8860_led *led)
 		goto out;
 	}

-	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
+	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs);
 	for (i = 0; i < reg_count; i++) {
 		ret = regmap_write(led->eeprom_regmap,
 				lp8860_eeprom_disp_regs[i].reg,
--- a/drivers/leds/leds-lp8864.c
+++ b/drivers/leds/leds-lp8864.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TI LP8864/LP8866 4/6 Channel LED Driver
+ *
+ * Copyright (C) 2024 Siemens AG
+ *
+ * Based on LP8860 driver by Dan Murphy <dmurphy@ti.com>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#define LP8864_BRT_CONTROL		0x00
+#define LP8864_USER_CONFIG1		0x04
+#define   LP8864_BRT_MODE_MASK		GENMASK(9, 8)
+#define   LP8864_BRT_MODE_REG		BIT(9)		/* Brightness control by DISPLAY_BRT reg */
+#define LP8864_SUPPLY_STATUS		0x0e
+#define LP8864_BOOST_STATUS		0x10
+#define LP8864_LED_STATUS		0x12
+#define   LP8864_LED_STATUS_WR_MASK	GENMASK(14, 9)	/* Writeable bits in the LED_STATUS reg */
+
+/* Textual meaning for status bits, starting from bit 1 */
+static const char *const lp8864_supply_status_msg[] = {
+	"Vin under-voltage fault",
+	"Vin over-voltage fault",
+	"Vdd under-voltage fault",
+	"Vin over-current fault",
+	"Missing charge pump fault",
+	"Charge pump fault",
+	"Missing boost sync fault",
+	"CRC error fault ",
+};
+
+/* Textual meaning for status bits, starting from bit 1 */
+static const char *const lp8864_boost_status_msg[] = {
+	"Boost OVP low fault",
+	"Boost OVP high fault",
+	"Boost over-current fault",
+	"Missing boost FSET resistor fault",
+	"Missing MODE SEL resistor fault",
+	"Missing LED resistor fault",
+	"ISET resistor short to ground fault",
+	"Thermal shutdown fault",
+};
+
+/* Textual meaning for every register bit */
+static const char *const lp8864_led_status_msg[] = {
+	"LED 1 fault",
+	"LED 2 fault",
+	"LED 3 fault",
+	"LED 4 fault",
+	"LED 5 fault",
+	"LED 6 fault",
+	"LED open fault",
+	"LED internal short fault",
+	"LED short to GND fault",
+	NULL, NULL, NULL,
+	"Invalid string configuration fault",
+	NULL,
+	"I2C time out fault",
+};
+
+/**
+ * struct lp8864_led
+ * @client: Pointer to the I2C client
+ * @led_dev: led class device pointer
+ * @regmap: Devices register map
+ * @led_status_mask: Helps to report LED fault only once
+ */
+struct lp8864_led {
+	struct i2c_client *client;
+	struct led_classdev led_dev;
+	struct regmap *regmap;
+	u16 led_status_mask;
+};
+
+static int lp8864_fault_check(struct lp8864_led *led)
+{
+	int ret, i;
+	unsigned int val;
+
+	ret = regmap_read(led->regmap, LP8864_SUPPLY_STATUS, &val);
+	if (ret)
+		goto err;
+
+	/* Odd bits are status bits, even bits are clear bits */
+	for (i = 0; i < ARRAY_SIZE(lp8864_supply_status_msg); i++)
+		if (val & BIT(i * 2 + 1))
+			dev_warn(&led->client->dev, "%s\n", lp8864_supply_status_msg[i]);
+
+	/*
+	 * Clear bits have an index preceding the corresponding Status bits;
+	 * both have to be written "1" simultaneously to clear the corresponding
+	 * Status bit.
+	 */
+	if (val)
+		ret = regmap_write(led->regmap, LP8864_SUPPLY_STATUS, val >> 1 | val);
+	if (ret)
+		goto err;
+
+	ret = regmap_read(led->regmap, LP8864_BOOST_STATUS, &val);
+	if (ret)
+		goto err;
+
+	/* Odd bits are status bits, even bits are clear bits */
+	for (i = 0; i < ARRAY_SIZE(lp8864_boost_status_msg); i++)
+		if (val & BIT(i * 2 + 1))
+			dev_warn(&led->client->dev, "%s\n", lp8864_boost_status_msg[i]);
+
+	if (val)
+		ret = regmap_write(led->regmap, LP8864_BOOST_STATUS, val >> 1 | val);
+	if (ret)
+		goto err;
+
+	ret = regmap_read(led->regmap, LP8864_LED_STATUS, &val);
+	if (ret)
+		goto err;
+
+	/*
+	 * Clear already reported faults that maintain their value until device
+	 * power-down
+	 */
+	val &= ~led->led_status_mask;
+
+	for (i = 0; i < ARRAY_SIZE(lp8864_led_status_msg); i++)
+		if (lp8864_led_status_msg[i] && val & BIT(i))
+			dev_warn(&led->client->dev, "%s\n", lp8864_led_status_msg[i]);
+
+	/*
+	 * Mark those which maintain their value until device power-down as
+	 * "already reported"
+	 */
+	led->led_status_mask |= val & ~LP8864_LED_STATUS_WR_MASK;
+
+	/*
+	 * Only bits 14, 12, 10 have to be cleared here, but others are RO,
+	 * we don't care what we write to them.
+	 */
+	if (val & LP8864_LED_STATUS_WR_MASK)
+		ret = regmap_write(led->regmap, LP8864_LED_STATUS, val >> 1 | val);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	dev_err(&led->client->dev, "Failed to read/clear faults (%pe)\n", ERR_PTR(ret));
+
+	return ret;
+}
+
+static int lp8864_brightness_set(struct led_classdev *led_cdev,
+				 enum led_brightness brt_val)
+{
+	struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, led_dev);
+	/* Scale 0..LED_FULL into 16-bit HW brightness */
+	unsigned int val = brt_val * 0xffff / LED_FULL;
+	int ret;
+
+	ret = lp8864_fault_check(led);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(led->regmap, LP8864_BRT_CONTROL, val);
+	if (ret)
+		dev_err(&led->client->dev, "Failed to write brightness value\n");
+
+	return ret;
+}
+
+static enum led_brightness lp8864_brightness_get(struct led_classdev *led_cdev)
+{
+	struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, led_dev);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(led->regmap, LP8864_BRT_CONTROL, &val);
+	if (ret) {
+		dev_err(&led->client->dev, "Failed to read brightness value\n");
+		return ret;
+	}
+
+	/* Scale 16-bit HW brightness into 0..LED_FULL */
+	return val * LED_FULL / 0xffff;
+}
+
+static const struct regmap_config lp8864_regmap_config = {
+	.reg_bits		= 8,
+	.val_bits		= 16,
+	.val_format_endian	= REGMAP_ENDIAN_LITTLE,
+};
+
+static void lp8864_disable_gpio(void *data)
+{
+	struct gpio_desc *gpio = data;
+
+	gpiod_set_value(gpio, 0);
+}
+
+static int lp8864_probe(struct i2c_client *client)
+{
+	int ret;
+	struct lp8864_led *led;
+	struct device_node *np = dev_of_node(&client->dev);
+	struct device_node *child_node;
+	struct led_init_data init_data = {};
+	struct gpio_desc *enable_gpio;
+
+	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	child_node = of_get_next_available_child(np, NULL);
+	if (!child_node) {
+		dev_err(&client->dev, "No LED function defined\n");
+		return -EINVAL;
+	}
+
+	ret = devm_regulator_get_enable_optional(&client->dev, "vled");
+	if (ret && ret != -ENODEV)
+		return dev_err_probe(&client->dev, ret, "Failed to enable vled regulator\n");
+
+	enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);
+	if (IS_ERR(enable_gpio))
+		return dev_err_probe(&client->dev, PTR_ERR(enable_gpio),
+				     "Failed to get enable GPIO\n");
+
+	ret = devm_add_action_or_reset(&client->dev, lp8864_disable_gpio, enable_gpio);
+	if (ret)
+		return ret;
+
+	led->client = client;
+	led->led_dev.brightness_set_blocking = lp8864_brightness_set;
+	led->led_dev.brightness_get = lp8864_brightness_get;
+
+	led->regmap = devm_regmap_init_i2c(client, &lp8864_regmap_config);
+	if (IS_ERR(led->regmap))
+		return dev_err_probe(&client->dev, PTR_ERR(led->regmap),
+				     "Failed to allocate regmap\n");
+
+	/* Control brightness by DISPLAY_BRT register */
+	ret = regmap_update_bits(led->regmap, LP8864_USER_CONFIG1, LP8864_BRT_MODE_MASK,
+								   LP8864_BRT_MODE_REG);
+	if (ret) {
+		dev_err(&led->client->dev, "Failed to set brightness control mode\n");
+		return ret;
+	}
+
+	ret = lp8864_fault_check(led);
+	if (ret)
+		return ret;
+
+	init_data.fwnode = of_fwnode_handle(child_node);
+	init_data.devicename = "lp8864";
+	init_data.default_label = ":display_cluster";
+
+	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev, &init_data);
+	if (ret)
+		dev_err(&client->dev, "Failed to register LED device (%pe)\n", ERR_PTR(ret));
+
+	return ret;
+}
+
+static const struct i2c_device_id lp8864_id[] = {
+	{ "lp8864" },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, lp8864_id);
+
+static const struct of_device_id of_lp8864_leds_match[] = {
+	{ .compatible = "ti,lp8864" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, of_lp8864_leds_match);
+
+static struct i2c_driver lp8864_driver = {
+	.driver = {
+		.name	= "lp8864",
+		.of_match_table = of_lp8864_leds_match,
+	},
+	.probe		= lp8864_probe,
+	.id_table	= lp8864_id,
+};
+module_i2c_driver(lp8864_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP8864/LP8866 LED driver");
+MODULE_AUTHOR("Alexander Sverdlin <alexander.sverdlin@siemens.com>");
+MODULE_LICENSE("GPL");
--- a/drivers/leds/leds-netxbig.c
+++ b/drivers/leds/leds-netxbig.c
@@ -439,6 +439,7 @@ static int netxbig_leds_get_of_pdata(struct device *dev,
 	}
 	gpio_ext_pdev = of_find_device_by_node(gpio_ext_np);
 	if (!gpio_ext_pdev) {
+		of_node_put(gpio_ext_np);
 		dev_err(dev, "Failed to find platform device for gpio-ext\n");
 		return -ENODEV;
 	}
--- a/drivers/leds/leds-turris-omnia.c
+++ b/drivers/leds/leds-turris-omnia.c
@@ -2,7 +2,7 @@
 /*
 * CZ.NIC's Turris Omnia LEDs driver
 *
- * 2020, 2023 by Marek Behún <kabel@kernel.org>
+ * 2020, 2023, 2024 by Marek Behún <kabel@kernel.org>
 */

 #include <linux/i2c.h>
@@ -10,35 +10,23 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
+#include <linux/turris-omnia-mcu-interface.h>

 #define OMNIA_BOARD_LEDS	12
 #define OMNIA_LED_NUM_CHANNELS	3

-/* MCU controller commands at I2C address 0x2a */
-#define OMNIA_MCU_I2C_ADDR		0x2a
-
-#define CMD_GET_STATUS_WORD		0x01
-#define STS_FEATURES_SUPPORTED		BIT(2)
-
-#define CMD_GET_FEATURES		0x10
-#define FEAT_LED_GAMMA_CORRECTION	BIT(5)
-
-/* LED controller commands at I2C address 0x2b */
-#define CMD_LED_MODE			0x03
-#define CMD_LED_MODE_LED(l)		((l) & 0x0f)
-#define CMD_LED_MODE_USER		0x10
-
-#define CMD_LED_STATE			0x04
-#define CMD_LED_STATE_LED(l)		((l) & 0x0f)
-#define CMD_LED_STATE_ON		0x10
-
-#define CMD_LED_COLOR			0x05
-#define CMD_LED_SET_BRIGHTNESS		0x07
-#define CMD_LED_GET_BRIGHTNESS		0x08
-
-#define CMD_SET_GAMMA_CORRECTION	0x30
-#define CMD_GET_GAMMA_CORRECTION	0x31
+/* MCU controller I2C address 0x2a, needed for detecting MCU features */
+#define OMNIA_MCU_I2C_ADDR	0x2a

+/**
+ * struct omnia_led - per-LED part of driver private data structure
+ * @mc_cdev:		multi-color LED class device
+ * @subled_info:	per-channel information
+ * @cached_channels:	cached values of per-channel brightness that was sent to the MCU
+ * @on:			whether the LED was set on
+ * @hwtrig:		whether the LED blinking was offloaded to the MCU
+ * @reg:		LED identifier to the MCU
+ */
 struct omnia_led {
 	struct led_classdev_mc mc_cdev;
 	struct mc_subled subled_info[OMNIA_LED_NUM_CHANNELS];
@@ -49,73 +37,38 @@ struct omnia_led {

 #define to_omnia_led(l)		container_of(l, struct omnia_led, mc_cdev)

+/**
+ * struct omnia_leds - driver private data structure
+ * @client:			I2C client device
+ * @lock:			mutex to protect cached state
+ * @has_gamma_correction:	whether the MCU firmware supports gamma correction
+ * @brightness_knode:		kernel node of the "brightness" device sysfs attribute (this is the
+ *				driver specific global brightness, not the LED classdev brightness)
+ * @leds:			flexible array of per-LED data
+ */
 struct omnia_leds {
 	struct i2c_client *client;
 	struct mutex lock;
 	bool has_gamma_correction;
+	struct kernfs_node *brightness_knode;
 	struct omnia_led leds[];
 };

-static int omnia_cmd_write_u8(const struct i2c_client *client, u8 cmd, u8 val)
+static int omnia_cmd_set_color(const struct i2c_client *client, u8 led, u8 r, u8 g, u8 b)
 {
-	u8 buf[2] = { cmd, val };
-	int ret;
+	u8 buf[5] = { OMNIA_CMD_LED_COLOR, led, r, g, b };

-	ret = i2c_master_send(client, buf, sizeof(buf));
-
-	return ret < 0 ? ret : 0;
-}
-
-static int omnia_cmd_read_raw(struct i2c_adapter *adapter, u8 addr, u8 cmd,
-			      void *reply, size_t len)
-{
-	struct i2c_msg msgs[2];
-	int ret;
-
-	msgs[0].addr = addr;
-	msgs[0].flags = 0;
-	msgs[0].len = 1;
-	msgs[0].buf = &cmd;
-	msgs[1].addr = addr;
-	msgs[1].flags = I2C_M_RD;
-	msgs[1].len = len;
-	msgs[1].buf = reply;
-
-	ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
-	if (likely(ret == ARRAY_SIZE(msgs)))
-		return 0;
-	else if (ret < 0)
-		return ret;
-	else
-		return -EIO;
-}
-
-static int omnia_cmd_read_u8(const struct i2c_client *client, u8 cmd)
-{
-	u8 reply;
-	int err;
-
-	err = omnia_cmd_read_raw(client->adapter, client->addr, cmd, &reply, 1);
-	if (err)
-		return err;
-
-	return reply;
+	return omnia_cmd_write(client, buf, sizeof(buf));
 }

 static int omnia_led_send_color_cmd(const struct i2c_client *client,
 				    struct omnia_led *led)
 {
-	char cmd[5];
 	int ret;

-	cmd[0] = CMD_LED_COLOR;
-	cmd[1] = led->reg;
-	cmd[2] = led->subled_info[0].brightness;
-	cmd[3] = led->subled_info[1].brightness;
-	cmd[4] = led->subled_info[2].brightness;
-
 	/* Send the color change command */
-	ret = i2c_master_send(client, cmd, 5);
+	ret = omnia_cmd_set_color(client, led->reg, led->subled_info[0].brightness,
+				  led->subled_info[1].brightness, led->subled_info[2].brightness);
 	if (ret < 0)
 		return ret;

@@ -170,12 +123,12 @@ static int omnia_led_brightness_set_blocking(struct led_classdev *cdev,
 	 * is not being blinked by HW.
 	 */
 	if (!err && !led->hwtrig && !brightness != !led->on) {
-		u8 state = CMD_LED_STATE_LED(led->reg);
+		u8 state = OMNIA_CMD_LED_STATE_LED(led->reg);

 		if (brightness)
-			state |= CMD_LED_STATE_ON;
+			state |= OMNIA_CMD_LED_STATE_ON;

-		err = omnia_cmd_write_u8(leds->client, CMD_LED_STATE, state);
+		err = omnia_cmd_write_u8(leds->client, OMNIA_CMD_LED_STATE, state);
 		if (!err)
 			led->on = !!brightness;
 	}
@@ -210,8 +163,8 @@ static int omnia_hwtrig_activate(struct led_classdev *cdev)

 	if (!err) {
 		/* Put the LED into MCU controlled mode */
-		err = omnia_cmd_write_u8(leds->client, CMD_LED_MODE,
-					 CMD_LED_MODE_LED(led->reg));
+		err = omnia_cmd_write_u8(leds->client, OMNIA_CMD_LED_MODE,
+					 OMNIA_CMD_LED_MODE_LED(led->reg));
 		if (!err)
 			led->hwtrig = true;
 	}
@@ -232,9 +185,8 @@ static void omnia_hwtrig_deactivate(struct led_classdev *cdev)
 	led->hwtrig = false;

 	/* Put the LED into software mode */
-	err = omnia_cmd_write_u8(leds->client, CMD_LED_MODE,
-				 CMD_LED_MODE_LED(led->reg) |
-				 CMD_LED_MODE_USER);
+	err = omnia_cmd_write_u8(leds->client, OMNIA_CMD_LED_MODE,
+				 OMNIA_CMD_LED_MODE_LED(led->reg) | OMNIA_CMD_LED_MODE_USER);

 	mutex_unlock(&leds->lock);

@@ -300,38 +252,26 @@ static int omnia_led_register(struct i2c_client *client, struct omnia_led *led,
 	 */
 	cdev->default_trigger = omnia_hw_trigger.name;

-	/* put the LED into software mode */
-	ret = omnia_cmd_write_u8(client, CMD_LED_MODE,
-				 CMD_LED_MODE_LED(led->reg) |
-				 CMD_LED_MODE_USER);
-	if (ret) {
-		dev_err(dev, "Cannot set LED %pOF to software mode: %i\n", np,
-			ret);
-		return ret;
-	}
+	/* Put the LED into software mode */
+	ret = omnia_cmd_write_u8(client, OMNIA_CMD_LED_MODE, OMNIA_CMD_LED_MODE_LED(led->reg) |
+							     OMNIA_CMD_LED_MODE_USER);
+	if (ret)
+		return dev_err_probe(dev, ret, "Cannot set LED %pOF to software mode\n", np);

-	/* disable the LED */
-	ret = omnia_cmd_write_u8(client, CMD_LED_STATE,
-				 CMD_LED_STATE_LED(led->reg));
-	if (ret) {
-		dev_err(dev, "Cannot set LED %pOF brightness: %i\n", np, ret);
-		return ret;
-	}
+	/* Disable the LED */
+	ret = omnia_cmd_write_u8(client, OMNIA_CMD_LED_STATE, OMNIA_CMD_LED_STATE_LED(led->reg));
+	if (ret)
+		return dev_err_probe(dev, ret, "Cannot set LED %pOF brightness\n", np);

 	/* Set initial color and cache it */
 	ret = omnia_led_send_color_cmd(client, led);
-	if (ret < 0) {
-		dev_err(dev, "Cannot set LED %pOF initial color: %i\n", np,
-			ret);
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Cannot set LED %pOF initial color\n", np);

 	ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc_cdev,
 							&init_data);
-	if (ret < 0) {
-		dev_err(dev, "Cannot register LED %pOF: %i\n", np, ret);
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Cannot register LED %pOF\n", np);

 	return 1;
 }
@@ -351,14 +291,14 @@ static ssize_t brightness_show(struct device *dev, struct device_attribute *a,
 			       char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	int ret;
+	u8 reply;
+	int err;

-	ret = omnia_cmd_read_u8(client, CMD_LED_GET_BRIGHTNESS);
+	err = omnia_cmd_read_u8(client, OMNIA_CMD_GET_BRIGHTNESS, &reply);
+	if (err < 0)
+		return err;

-	if (ret < 0)
-		return ret;
-
-	return sysfs_emit(buf, "%d\n", ret);
+	return sysfs_emit(buf, "%d\n", reply);
 }

 static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
@@ -374,7 +314,7 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
 	if (brightness > 100)
 		return -EINVAL;

-	err = omnia_cmd_write_u8(client, CMD_LED_SET_BRIGHTNESS, brightness);
+	err = omnia_cmd_write_u8(client, OMNIA_CMD_SET_BRIGHTNESS, brightness);

 	return err ?: count;
 }
@@ -385,17 +325,16 @@ static ssize_t gamma_correction_show(struct device *dev,
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct omnia_leds *leds = i2c_get_clientdata(client);
-	int ret;
+	u8 reply = 0;
+	int err;

 	if (leds->has_gamma_correction) {
-		ret = omnia_cmd_read_u8(client, CMD_GET_GAMMA_CORRECTION);
-		if (ret < 0)
-			return ret;
-	} else {
-		ret = 0;
+		err = omnia_cmd_read_u8(client, OMNIA_CMD_GET_GAMMA_CORRECTION, &reply);
+		if (err < 0)
+			return err;
 	}

-	return sysfs_emit(buf, "%d\n", !!ret);
+	return sysfs_emit(buf, "%d\n", !!reply);
 }

 static ssize_t gamma_correction_store(struct device *dev,
@@ -413,7 +352,7 @@ static ssize_t gamma_correction_store(struct device *dev,
 	if (kstrtobool(buf, &val) < 0)
 		return -EINVAL;

-	err = omnia_cmd_write_u8(client, CMD_SET_GAMMA_CORRECTION, val);
+	err = omnia_cmd_write_u8(client, OMNIA_CMD_SET_GAMMA_CORRECTION, val);

 	return err ?: count;
 }
@@ -426,26 +365,104 @@ static struct attribute *omnia_led_controller_attrs[] = {
 };
 ATTRIBUTE_GROUPS(omnia_led_controller);

-static int omnia_mcu_get_features(const struct i2c_client *client)
+static irqreturn_t omnia_brightness_changed_threaded_fn(int irq, void *data)
+{
+	struct omnia_leds *leds = data;
+
+	if (unlikely(!leds->brightness_knode)) {
+		/*
+		 * Note that sysfs_get_dirent() may sleep. This is okay, because we are in threaded
+		 * context.
+		 */
+		leds->brightness_knode = sysfs_get_dirent(leds->client->dev.kobj.sd, "brightness");
+		if (!leds->brightness_knode)
+			return IRQ_NONE;
+	}
+
+	sysfs_notify_dirent(leds->brightness_knode);
+
+	return IRQ_HANDLED;
+}
+
+static void omnia_brightness_knode_put(void *data)
+{
+	struct omnia_leds *leds = data;
+
+	if (leds->brightness_knode)
+		sysfs_put(leds->brightness_knode);
+}
+
+static int omnia_request_brightness_irq(struct omnia_leds *leds)
+{
+	struct device *dev = &leds->client->dev;
+	int ret;
+
+	if (!leds->client->irq) {
+		dev_info(dev,
+			 "Brightness change interrupt supported by MCU firmware but not described in device-tree\n");
+
+		return 0;
+	}
+
+	/*
+	 * Registering the brightness_knode destructor before requesting the IRQ ensures that on
+	 * removal the brightness_knode sysfs node is put only after the IRQ is freed.
+	 * This is needed because the interrupt handler uses the knode.
+	 */
+	ret = devm_add_action(dev, omnia_brightness_knode_put, leds);
+	if (ret < 0)
+		return ret;
+
+	return devm_request_threaded_irq(dev, leds->client->irq, NULL,
+					 omnia_brightness_changed_threaded_fn, IRQF_ONESHOT,
+					 "leds-turris-omnia", leds);
+}
+
+static int omnia_mcu_get_features(const struct i2c_client *mcu_client)
 {
 	u16 reply;
 	int err;

-	err = omnia_cmd_read_raw(client->adapter, OMNIA_MCU_I2C_ADDR,
-				 CMD_GET_STATUS_WORD, &reply, sizeof(reply));
+	err = omnia_cmd_read_u16(mcu_client, OMNIA_CMD_GET_STATUS_WORD, &reply);
 	if (err)
 		return err;

-	/* Check whether MCU firmware supports the CMD_GET_FEAUTRES command */
-	if (!(le16_to_cpu(reply) & STS_FEATURES_SUPPORTED))
+	/* Check whether MCU firmware supports the OMNIA_CMD_GET_FEAUTRES command */
+	if (!(reply & OMNIA_STS_FEATURES_SUPPORTED))
 		return 0;

-	err = omnia_cmd_read_raw(client->adapter, OMNIA_MCU_I2C_ADDR,
-				 CMD_GET_FEATURES, &reply, sizeof(reply));
+	err = omnia_cmd_read_u16(mcu_client, OMNIA_CMD_GET_FEATURES, &reply);
 	if (err)
 		return err;

-	return le16_to_cpu(reply);
+	return reply;
+}
+
+static int omnia_match_mcu_client(struct device *dev, void *data)
+{
+	struct i2c_client *client;
+
+	client = i2c_verify_client(dev);
+	if (!client)
+		return 0;
+
+	return client->addr == OMNIA_MCU_I2C_ADDR;
+}
+
+static int omnia_find_mcu_and_get_features(struct device *dev)
+{
+	struct device *mcu_dev;
+	int ret;
+
+	mcu_dev = device_find_child(dev->parent, NULL, omnia_match_mcu_client);
+	if (!mcu_dev)
+		return -ENODEV;
+
+	ret = omnia_mcu_get_features(i2c_verify_client(mcu_dev));
+
+	put_device(mcu_dev);
+
+	return ret;
 }

 static int omnia_leds_probe(struct i2c_client *client)
@@ -457,13 +474,10 @@ static int omnia_leds_probe(struct i2c_client *client)
 	int ret, count;

 	count = of_get_available_child_count(np);
-	if (!count) {
-		dev_err(dev, "LEDs are not defined in device tree!\n");
-		return -ENODEV;
-	} else if (count > OMNIA_BOARD_LEDS) {
-		dev_err(dev, "Too many LEDs defined in device tree!\n");
-		return -EINVAL;
-	}
+	if (count == 0)
+		return dev_err_probe(dev, -ENODEV, "LEDs are not defined in device tree!\n");
+	if (count > OMNIA_BOARD_LEDS)
+		return dev_err_probe(dev, -EINVAL, "Too many LEDs defined in device tree!\n");

 	leds = devm_kzalloc(dev, struct_size(leds, leds, count), GFP_KERNEL);
 	if (!leds)
@@ -472,28 +486,23 @@ static int omnia_leds_probe(struct i2c_client *client)
 	leds->client = client;
 	i2c_set_clientdata(client, leds);

-	ret = omnia_mcu_get_features(client);
-	if (ret < 0) {
-		dev_err(dev, "Cannot determine MCU supported features: %d\n",
-			ret);
-		return ret;
-	}
+	ret = omnia_find_mcu_and_get_features(dev);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Cannot determine MCU supported features\n");

-	leds->has_gamma_correction = ret & FEAT_LED_GAMMA_CORRECTION;
-	if (!leds->has_gamma_correction) {
-		dev_info(dev,
-			 "Your board's MCU firmware does not support the LED gamma correction feature.\n");
-		dev_info(dev,
-			 "Consider upgrading MCU firmware with the omnia-mcutool utility.\n");
+	leds->has_gamma_correction = ret & OMNIA_FEAT_LED_GAMMA_CORRECTION;
+
+	if (ret & OMNIA_FEAT_BRIGHTNESS_INT) {
+		ret = omnia_request_brightness_irq(leds);
+		if (ret < 0)
+			return dev_err_probe(dev, ret, "Cannot request brightness IRQ\n");
 	}

 	mutex_init(&leds->lock);

 	ret = devm_led_trigger_register(dev, &omnia_hw_trigger);
-	if (ret < 0) {
-		dev_err(dev, "Cannot register private LED trigger: %d\n", ret);
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Cannot register private LED trigger\n");

 	led = &leds->leds[0];
 	for_each_available_child_of_node_scoped(np, child) {
@@ -509,20 +518,11 @@ static int omnia_leds_probe(struct i2c_client *client)

 static void omnia_leds_remove(struct i2c_client *client)
 {
-	u8 buf[5];
+	/* Put all LEDs into default (HW triggered) mode */
+	omnia_cmd_write_u8(client, OMNIA_CMD_LED_MODE, OMNIA_CMD_LED_MODE_LED(OMNIA_BOARD_LEDS));

-	/* put all LEDs into default (HW triggered) mode */
-	omnia_cmd_write_u8(client, CMD_LED_MODE,
-			   CMD_LED_MODE_LED(OMNIA_BOARD_LEDS));
-
-	/* set all LEDs color to [255, 255, 255] */
-	buf[0] = CMD_LED_COLOR;
-	buf[1] = OMNIA_BOARD_LEDS;
-	buf[2] = 255;
-	buf[3] = 255;
-	buf[4] = 255;
-
-	i2c_master_send(client, buf, 5);
+	/* Set all LEDs color to [255, 255, 255] */
+	omnia_cmd_set_color(client, OMNIA_BOARD_LEDS, 255, 255, 255);
 }

 static const struct of_device_id of_omnia_leds_match[] = {
--- a/drivers/leds/leds-upboard.c
+++ b/drivers/leds/leds-upboard.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * UP board LED driver.
+ *
+ * Copyright (c) AAEON. All rights reserved.
+ * Copyright (C) 2024 Bootlin
+ *
+ * Author: Gary Wang <garywang@aaeon.com.tw>
+ * Author: Thomas Richard <thomas.richard@bootlin.com>
+ */
+
+#include <linux/device.h>
+#include <linux/container_of.h>
+#include <linux/leds.h>
+#include <linux/mfd/upboard-fpga.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define led_cdev_to_led_upboard(c)	container_of(c, struct upboard_led, cdev)
+
+struct upboard_led {
+	struct regmap_field *field;
+	struct led_classdev cdev;
+};
+
+struct upboard_led_profile {
+	const char *name;
+	unsigned int bit;
+};
+
+static struct upboard_led_profile upboard_up_led_profile[] = {
+	{ "upboard:yellow:" LED_FUNCTION_STATUS, 0 },
+	{ "upboard:green:" LED_FUNCTION_STATUS, 1 },
+	{ "upboard:red:" LED_FUNCTION_STATUS, 2 },
+};
+
+static struct upboard_led_profile upboard_up2_led_profile[] = {
+	{ "upboard:blue:" LED_FUNCTION_STATUS, 0 },
+	{ "upboard:yellow:" LED_FUNCTION_STATUS, 1 },
+	{ "upboard:green:" LED_FUNCTION_STATUS, 2 },
+	{ "upboard:red:" LED_FUNCTION_STATUS, 3 },
+};
+
+static enum led_brightness upboard_led_brightness_get(struct led_classdev *cdev)
+{
+	struct upboard_led *led = led_cdev_to_led_upboard(cdev);
+	int brightness, ret;
+
+	ret = regmap_field_read(led->field, &brightness);
+
+	return ret ? LED_OFF : brightness;
+};
+
+static int upboard_led_brightness_set(struct led_classdev *cdev, enum led_brightness brightness)
+{
+	struct upboard_led *led = led_cdev_to_led_upboard(cdev);
+
+	return regmap_field_write(led->field, brightness != LED_OFF);
+};
+
+static int upboard_led_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct upboard_fpga *fpga = dev_get_drvdata(dev->parent);
+	struct upboard_led_profile *led_profile;
+	struct upboard_led *led;
+	int led_instances, ret, i;
+
+	switch (fpga->fpga_data->type) {
+	case UPBOARD_UP_FPGA:
+		led_profile = upboard_up_led_profile;
+		led_instances = ARRAY_SIZE(upboard_up_led_profile);
+		break;
+	case UPBOARD_UP2_FPGA:
+		led_profile = upboard_up2_led_profile;
+		led_instances = ARRAY_SIZE(upboard_up2_led_profile);
+		break;
+	default:
+		return dev_err_probe(dev, -EINVAL, "Unknown device type %d\n",
+				     fpga->fpga_data->type);
+	}
+
+	for (i = 0; i < led_instances; i++) {
+		const struct reg_field fldconf = {
+			.reg = UPBOARD_REG_FUNC_EN0,
+			.lsb = led_profile[i].bit,
+			.msb = led_profile[i].bit,
+		};
+
+		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+		if (!led)
+			return -ENOMEM;
+
+		led->field = devm_regmap_field_alloc(&pdev->dev, fpga->regmap, fldconf);
+		if (IS_ERR(led->field))
+			return PTR_ERR(led->field);
+
+		led->cdev.brightness_get = upboard_led_brightness_get;
+		led->cdev.brightness_set_blocking = upboard_led_brightness_set;
+		led->cdev.max_brightness = LED_ON;
+
+		led->cdev.name = led_profile[i].name;
+
+		ret = devm_led_classdev_register(dev, &led->cdev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver upboard_led_driver = {
+	.driver = {
+		.name = "upboard-leds",
+	},
+	.probe = upboard_led_probe,
+};
+
+module_platform_driver(upboard_led_driver);
+
+MODULE_AUTHOR("Gary Wang <garywang@aaeon.com.tw>");
+MODULE_AUTHOR("Thomas Richard <thomas.richard@bootlin.com>");
+MODULE_DESCRIPTION("UP Board LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:upboard-led");
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -22,10 +22,10 @@ void led_stop_software_blink(struct led_classdev *led_cdev);
 void led_set_brightness_nopm(struct led_classdev *led_cdev, unsigned int value);
 void led_set_brightness_nosleep(struct led_classdev *led_cdev, unsigned int value);
 ssize_t led_trigger_read(struct file *filp, struct kobject *kobj,
-			struct bin_attribute *attr, char *buf,
+			const struct bin_attribute *attr, char *buf,
 			loff_t pos, size_t count);
 ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
-			struct bin_attribute *bin_attr, char *buf,
+			const struct bin_attribute *bin_attr, char *buf,
 			loff_t pos, size_t count);

 extern struct rw_semaphore leds_list_lock;
--- a/drivers/leds/rgb/leds-pwm-multicolor.c
+++ b/drivers/leds/rgb/leds-pwm-multicolor.c
@@ -50,7 +50,13 @@ static int led_pwm_mc_set(struct led_classdev *cdev,
 			duty = priv->leds[i].state.period - duty;

 		priv->leds[i].state.duty_cycle = duty;
-		priv->leds[i].state.enabled = duty > 0;
+		/*
+		 * Disabling a PWM doesn't guarantee that it emits the inactive level.
+		 * So keep it on. Only for suspending the PWM should be disabled because
+		 * otherwise it refuses to suspend. The possible downside is that the
+		 * LED might stay (or even go) on.
+		 */
+		priv->leds[i].state.enabled = !(cdev->flags & LED_SUSPENDED);
 		ret = pwm_apply_might_sleep(priv->leds[i].pwm,
 					    &priv->leds[i].state);
 		if (ret)
--- a/drivers/leds/trigger/ledtrig-activity.c
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -156,7 +156,7 @@ static ssize_t led_invert_show(struct device *dev,
 {
 	struct activity_data *activity_data = led_trigger_get_drvdata(dev);

-	return sprintf(buf, "%u\n", activity_data->invert);
+	return sprintf(buf, "%d\n", activity_data->invert);
 }

 static ssize_t led_invert_store(struct device *dev,
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -605,6 +605,8 @@ static int netdev_trig_notify(struct notifier_block *nb,
 		trigger_data->net_dev = NULL;
 		break;
 	case NETDEV_UP:
+		trigger_data->hw_control = can_hw_control(trigger_data);
+		fallthrough;
 	case NETDEV_CHANGE:
 		get_device_state(trigger_data);
 		/* Refresh link_speed visibility */
--- a/Show More
+++ b/Show More