pinctrl: add NXP S32 SoC family support

Add the pinctrl driver for NXP S32 SoC family. This driver is mainly based
on NXP's downstream implementation on nxp-auto-linux repo[1].

[1] https://github.com/nxp-auto-linux/linux/tree/bsp35.0-5.15.73-rt/drivers/pinctrl/freescale

Signed-off-by: Matthew Nunez <matthew.nunez@nxp.com>
Signed-off-by: Phu Luu An <phu.luuan@nxp.com>
Signed-off-by: Stefan-Gabriel Mirea <stefan-gabriel.mirea@nxp.com>
Signed-off-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@oss.nxp.com>
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@nxp.com>
Signed-off-by: Radu Pirea <radu-nicolae.pirea@nxp.com>
Signed-off-by: Chester Lin <clin@suse.com>
Link: https://lore.kernel.org/r/20230220023320.3499-3-clin@suse.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -535,6 +535,7 @@ source "drivers/pinctrl/meson/Kconfig"
 source "drivers/pinctrl/mvebu/Kconfig"
 source "drivers/pinctrl/nomadik/Kconfig"
 source "drivers/pinctrl/nuvoton/Kconfig"
+source "drivers/pinctrl/nxp/Kconfig"
 source "drivers/pinctrl/pxa/Kconfig"
 source "drivers/pinctrl/qcom/Kconfig"
 source "drivers/pinctrl/ralink/Kconfig"

drivers/pinctrl/Makefile

@@ -64,6 +64,7 @@ obj-$(CONFIG_PINCTRL_MESON)	+= meson/
 obj-y				+= mvebu/
 obj-y				+= nomadik/
 obj-y				+= nuvoton/
+obj-y				+= nxp/
 obj-$(CONFIG_PINCTRL_PXA)	+= pxa/
 obj-$(CONFIG_ARCH_QCOM)		+= qcom/
 obj-$(CONFIG_PINCTRL_RALINK)	+= ralink/

drivers/pinctrl/nxp/Kconfig

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config PINCTRL_S32CC
+	bool
+	depends on ARCH_S32 && OF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+
+config PINCTRL_S32G2
+	depends on ARCH_S32 && OF
+	bool "NXP S32G2 pinctrl driver"
+	select PINCTRL_S32CC
+	help
+	  Say Y here to enable the pinctrl driver for NXP S32G2 family SoCs

drivers/pinctrl/nxp/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+# NXP pin control
+obj-$(CONFIG_PINCTRL_S32CC)	+= pinctrl-s32cc.o
+obj-$(CONFIG_PINCTRL_S32G2)	+= pinctrl-s32g2.o

drivers/pinctrl/nxp/pinctrl-s32.h

@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * S32 pinmux core definitions
+ *
+ * Copyright 2016-2020, 2022 NXP
+ * Copyright (C) 2022 SUSE LLC
+ * Copyright 2015-2016 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012 Linaro Ltd.
+ */
+
+#ifndef __DRIVERS_PINCTRL_S32_H
+#define __DRIVERS_PINCTRL_S32_H
+
+struct platform_device;
+
+/**
+ * struct s32_pin_group - describes an S32 pin group
+ * @name: the name of this specific pin group
+ * @npins: the number of pins in this group array, i.e. the number of
+ *         elements in pin_ids and pin_sss so we can iterate over that array
+ * @pin_ids: an array of pin IDs in this group
+ * @pin_sss: an array of source signal select configs paired with pin_ids
+ */
+struct s32_pin_group {
+	const char *name;
+	unsigned int npins;
+	unsigned int *pin_ids;
+	unsigned int *pin_sss;
+};
+
+/**
+ * struct s32_pmx_func - describes S32 pinmux functions
+ * @name: the name of this specific function
+ * @groups: corresponding pin groups
+ * @num_groups: the number of groups
+ */
+struct s32_pmx_func {
+	const char *name;
+	const char **groups;
+	unsigned int num_groups;
+};
+
+/**
+ * struct s32_pin_range - pin ID range for each memory region.
+ * @start: start pin ID
+ * @end: end pin ID
+ */
+struct s32_pin_range {
+	unsigned int start;
+	unsigned int end;
+};
+
+struct s32_pinctrl_soc_info {
+	struct device *dev;
+	const struct pinctrl_pin_desc *pins;
+	unsigned int npins;
+	struct s32_pin_group *groups;
+	unsigned int ngroups;
+	struct s32_pmx_func *functions;
+	unsigned int nfunctions;
+	unsigned int grp_index;
+	const struct s32_pin_range *mem_pin_ranges;
+	unsigned int mem_regions;
+};
+
+#define S32_PINCTRL_PIN(pin)	PINCTRL_PIN(pin, #pin)
+#define S32_PIN_RANGE(_start, _end) { .start = _start, .end = _end }
+
+int s32_pinctrl_probe(struct platform_device *pdev,
+			struct s32_pinctrl_soc_info *info);
+#ifdef CONFIG_PM_SLEEP
+int __maybe_unused s32_pinctrl_resume(struct device *dev);
+int __maybe_unused s32_pinctrl_suspend(struct device *dev);
+#endif
+#endif /* __DRIVERS_PINCTRL_S32_H */