pinctrl: cix: Add pin-controller support for sky1

There are two pin-controllers on Cix Sky1 platform.
one is used under S0 state, the other is used under S0 and S5 state.

Signed-off-by: Gary Yang <gary.yang@cixtech.com>
[Dropped pinctrl_provide_dummies()]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -702,6 +702,7 @@ source "drivers/pinctrl/aspeed/Kconfig"
 source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
 source "drivers/pinctrl/cirrus/Kconfig"
+source "drivers/pinctrl/cix/Kconfig"
 source "drivers/pinctrl/freescale/Kconfig"
 source "drivers/pinctrl/intel/Kconfig"
 source "drivers/pinctrl/mediatek/Kconfig"

drivers/pinctrl/Makefile

@@ -71,6 +71,7 @@ obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
 obj-y				+= bcm/
 obj-$(CONFIG_PINCTRL_BERLIN)	+= berlin/
 obj-y				+= cirrus/
+obj-y				+= cix/
 obj-y				+= freescale/
 obj-$(CONFIG_X86)		+= intel/
 obj-y				+= mediatek/

drivers/pinctrl/cix/Kconfig

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config PINCTRL_SKY1_BASE
+	tristate
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GENERIC_PINCONF
+	select REGMAP
+
+config PINCTRL_SKY1
+	tristate "Cix Sky1 pinctrl driver"
+	depends on ARCH_CIX || COMPILE_TEST
+	select PINCTRL_SKY1_BASE
+	help
+	  Say Y here to enable the sky1 pinctrl driver

drivers/pinctrl/cix/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+# Cix Sky1 pin control drivers
+obj-$(CONFIG_PINCTRL_SKY1_BASE)	+= pinctrl-sky1-base.o
+obj-$(CONFIG_PINCTRL_SKY1)	+= pinctrl-sky1.o

drivers/pinctrl/cix/pinctrl-sky1.h

@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Author: Jerry Zhu <Jerry.Zhu@cixtech.com>
+ */
+
+#ifndef __DRIVERS_PINCTRL_SKY1_H
+#define __DRIVERS_PINCTRL_SKY1_H
+
+struct sky1_pinctrl_group {
+	const char *name;
+	unsigned long config;
+	unsigned int pin;
+};
+
+struct sky1_pin_desc {
+	const struct pinctrl_pin_desc pin;
+	const char * const *func_group;
+	unsigned int nfunc;
+};
+
+struct sky1_pinctrl_soc_info {
+	const struct sky1_pin_desc *pins;
+	unsigned int npins;
+};
+
+#define SKY_PINFUNCTION(_pin, _func)				\
+((struct sky1_pin_desc) {					\
+		.pin = _pin,					\
+		.func_group = _func##_group,			\
+		.nfunc = ARRAY_SIZE(_func##_group),		\
+	})
+/**
+ * @dev: a pointer back to containing device
+ * @base: the offset to the controller in virtual memory
+ */
+struct sky1_pinctrl {
+	struct device *dev;
+	struct pinctrl_dev *pctl;
+	void __iomem *base;
+	const struct sky1_pinctrl_soc_info *info;
+	struct sky1_pinctrl_group *groups;
+	const char **grp_names;
+};
+
+int sky1_base_pinctrl_probe(struct platform_device *pdev,
+			const struct sky1_pinctrl_soc_info *info);
+
+#endif /* __DRIVERS_PINCTRL_SKY1_H */