pinctrl: actions: Add Actions S900 pinctrl driver

Add pinctrl driver for Actions Semi S900 SoC. The driver supports
pinctrl, pinmux and pinconf functionalities through a range of registers
common to both gpio driver and pinctrl driver.

Pinmux functionality is available only for the pin groups while the
pinconf functionality is available for both pin groups and individual
pins.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -337,6 +337,7 @@ config PINCTRL_OCELOT
 	select GENERIC_PINMUX_FUNCTIONS
 	select REGMAP_MMIO
 
+source "drivers/pinctrl/actions/Kconfig"
 source "drivers/pinctrl/aspeed/Kconfig"
 source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"

drivers/pinctrl/Makefile

@@ -43,6 +43,7 @@ obj-$(CONFIG_PINCTRL_INGENIC)	+= pinctrl-ingenic.o
 obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o
 obj-$(CONFIG_PINCTRL_OCELOT)	+= pinctrl-ocelot.o
 
+obj-y				+= actions/
 obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
 obj-y				+= bcm/
 obj-$(CONFIG_PINCTRL_BERLIN)	+= berlin/

drivers/pinctrl/actions/Kconfig

+config PINCTRL_OWL
+	bool
+	depends on (ARCH_ACTIONS || COMPILE_TEST) && OF
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
+config PINCTRL_S900
+	bool "Actions Semi S900 pinctrl driver"
+	select PINCTRL_OWL
+	help
+	  Say Y here to enable Actions Semi S900 pinctrl driver

drivers/pinctrl/actions/Makefile

+obj-$(CONFIG_PINCTRL_OWL)	+= pinctrl-owl.o
+obj-$(CONFIG_PINCTRL_S900) 	+= pinctrl-s900.o

drivers/pinctrl/actions/pinctrl-owl.h

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * OWL SoC's Pinctrl definitions
+ *
+ * Copyright (c) 2014 Actions Semi Inc.
+ * Author: David Liu <liuwei@actions-semi.com>
+ *
+ * Copyright (c) 2018 Linaro Ltd.
+ * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ */
+
+#ifndef __PINCTRL_OWL_H__
+#define __PINCTRL_OWL_H__
+
+#define OWL_PINCONF_SLEW_SLOW 0
+#define OWL_PINCONF_SLEW_FAST 1
+
+enum owl_pinconf_pull {
+	OWL_PINCONF_PULL_HIZ,
+	OWL_PINCONF_PULL_DOWN,
+	OWL_PINCONF_PULL_UP,
+	OWL_PINCONF_PULL_HOLD,
+};
+
+enum owl_pinconf_drv {
+	OWL_PINCONF_DRV_2MA,
+	OWL_PINCONF_DRV_4MA,
+	OWL_PINCONF_DRV_8MA,
+	OWL_PINCONF_DRV_12MA,
+};
+
+/**
+ * struct owl_pullctl - Actions pad pull control register
+ * @reg: offset to the pull control register
+ * @shift: shift value of the register
+ * @width: width of the register
+ */
+struct owl_pullctl {
+	int reg;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/**
+ * struct owl_st - Actions pad schmitt trigger enable register
+ * @reg: offset to the schmitt trigger enable register
+ * @shift: shift value of the register
+ * @width: width of the register
+ */
+struct owl_st {
+	int reg;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/**
+ * struct owl_pingroup - Actions pingroup definition
+ * @name: name of the  pin group
+ * @pads: list of pins assigned to this pingroup
+ * @npads: size of @pads array
+ * @funcs: list of pinmux functions for this pingroup
+ * @nfuncs: size of @funcs array
+ * @mfpctl_reg: multiplexing control register offset
+ * @mfpctl_shift: multiplexing control register bit mask
+ * @mfpctl_width: multiplexing control register width
+ * @drv_reg: drive control register offset
+ * @drv_shift: drive control register bit mask
+ * @drv_width: driver control register width
+ * @sr_reg: slew rate control register offset
+ * @sr_shift: slew rate control register bit mask
+ * @sr_width: slew rate control register width
+ */
+struct owl_pingroup {
+	const char *name;
+	unsigned int *pads;
+	unsigned int npads;
+	unsigned int *funcs;
+	unsigned int nfuncs;
+
+	int mfpctl_reg;
+	unsigned int mfpctl_shift;
+	unsigned int mfpctl_width;
+
+	int drv_reg;
+	unsigned int drv_shift;
+	unsigned int drv_width;
+
+	int sr_reg;
+	unsigned int sr_shift;
+	unsigned int sr_width;
+};
+
+/**
+ * struct owl_padinfo - Actions pinctrl pad info
+ * @pad: pad name of the SoC
+ * @pullctl: pull control register info
+ * @st: schmitt trigger register info
+ */
+struct owl_padinfo {
+	int pad;
+	struct owl_pullctl *pullctl;
+	struct owl_st *st;
+};
+
+/**
+ * struct owl_pinmux_func - Actions pinctrl mux functions
+ * @name: name of the pinmux function.
+ * @groups: array of pin groups that may select this function.
+ * @ngroups: number of entries in @groups.
+ */
+struct owl_pinmux_func {
+	const char *name;
+	const char * const *groups;
+	unsigned int ngroups;
+};
+
+/**
+ * struct owl_pinctrl_soc_data - Actions pin controller driver configuration
+ * @pins: array describing all pins of the pin controller.
+ * @npins: number of entries in @pins.
+ * @functions: array describing all mux functions of this SoC.
+ * @nfunction: number of entries in @functions.
+ * @groups: array describing all pin groups of this SoC.
+ * @ngroups: number of entries in @groups.
+ * @padinfo: array describing the pad info of this SoC.
+ * @ngpios: number of pingroups the driver should expose as GPIOs.
+ */
+struct owl_pinctrl_soc_data {
+	const struct pinctrl_pin_desc *pins;
+	unsigned int npins;
+	const struct owl_pinmux_func *functions;
+	unsigned int nfunctions;
+	const struct owl_pingroup *groups;
+	unsigned int ngroups;
+	const struct owl_padinfo *padinfo;
+	unsigned int ngpios;
+};
+
+int owl_pinctrl_probe(struct platform_device *pdev,
+		struct owl_pinctrl_soc_data *soc_data);
+
+#endif /* __PINCTRL_OWL_H__ */