pinctrl: realtek: Add common pinctrl driver for Realtek DHC RTD SoCs

The RTD SoCs share a similar design for pinmux and pinconfig.
This common pinctrl driver supports different variants within the RTD
SoCs.

Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Link: https://lore.kernel.org/r/20230919101117.4097-2-tychang@realtek.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -520,6 +520,7 @@ source "drivers/pinctrl/nuvoton/Kconfig"
 source "drivers/pinctrl/nxp/Kconfig"
 source "drivers/pinctrl/pxa/Kconfig"
 source "drivers/pinctrl/qcom/Kconfig"
+source "drivers/pinctrl/realtek/Kconfig"
 source "drivers/pinctrl/renesas/Kconfig"
 source "drivers/pinctrl/samsung/Kconfig"
 source "drivers/pinctrl/spear/Kconfig"

drivers/pinctrl/Makefile

@@ -66,6 +66,7 @@ obj-y				+= nuvoton/
 obj-y				+= nxp/
 obj-$(CONFIG_PINCTRL_PXA)	+= pxa/
 obj-y				+= qcom/
+obj-$(CONFIG_ARCH_REALTEK)      += realtek/
 obj-$(CONFIG_PINCTRL_RENESAS)	+= renesas/
 obj-$(CONFIG_PINCTRL_SAMSUNG)	+= samsung/
 obj-$(CONFIG_PINCTRL_SPEAR)	+= spear/

drivers/pinctrl/realtek/Kconfig

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+config PINCTRL_RTD
+	tristate "Realtek DHC core pin controller driver"
+	depends on ARCH_REALTEK
+	default y
+	select PINMUX
+	select GENERIC_PINCONF

drivers/pinctrl/realtek/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Realtek DHC pin control drivers
+obj-$(CONFIG_PINCTRL_RTD)		+= pinctrl-rtd.o

drivers/pinctrl/realtek/pinctrl-rtd.h

@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2023 Realtek Semiconductor Corp.
+ */
+
+#define NA 0xffffffff
+#define PADDRI_4_8 1
+#define PADDRI_2_4 0
+
+struct rtd_pin_group_desc {
+	const char *name;
+	const unsigned int *pins;
+	unsigned int num_pins;
+};
+
+struct rtd_pin_func_desc {
+	const char *name;
+	const char * const *groups;
+	unsigned int num_groups;
+};
+
+struct rtd_pin_mux_desc {
+	const char *name;
+	u32 mux_value;
+};
+
+struct rtd_pin_config_desc {
+	const char *name;
+	unsigned int reg_offset;
+	unsigned int base_bit;
+	unsigned int pud_en_offset;
+	unsigned int pud_sel_offset;
+	unsigned int curr_offset;
+	unsigned int smt_offset;
+	unsigned int power_offset;
+	unsigned int curr_type;
+};
+
+struct rtd_pin_sconfig_desc {
+	const char *name;
+	unsigned int reg_offset;
+	unsigned int dcycle_offset;
+	unsigned int dcycle_maskbits;
+	unsigned int ndrive_offset;
+	unsigned int ndrive_maskbits;
+	unsigned int pdrive_offset;
+	unsigned int pdrive_maskbits;
+};
+
+struct rtd_pin_desc {
+	const char *name;
+	unsigned int mux_offset;
+	u32 mux_mask;
+	const struct rtd_pin_mux_desc *functions;
+};
+
+struct rtd_pin_reg_list {
+	unsigned int reg_offset;
+	unsigned int val;
+};
+
+#define SHIFT_LEFT(_val, _shift) ((_val) << (_shift))
+
+#define RTK_PIN_MUX(_name, _mux_off, _mux_mask, ...) \
+	{ \
+		.name = # _name, \
+		.mux_offset = _mux_off, \
+		.mux_mask = _mux_mask, \
+		.functions = (const struct rtd_pin_mux_desc []) { \
+			__VA_ARGS__, { } \
+		}, \
+	}
+
+#define RTK_PIN_CONFIG(_name, _reg_off, _base_bit, _pud_en_off, \
+		       _pud_sel_off, _curr_off, _smt_off, _pow_off, _curr_type) \
+	{ \
+		.name = # _name, \
+		.reg_offset = _reg_off, \
+		.base_bit = _base_bit, \
+		.pud_en_offset = _pud_en_off, \
+		.pud_sel_offset = _pud_sel_off, \
+		.curr_offset = _curr_off, \
+		.smt_offset = _smt_off, \
+		.power_offset = _pow_off, \
+		.curr_type = _curr_type, \
+	}
+
+#define RTK_PIN_SCONFIG(_name, _reg_off, _d_offset, _d_mask, \
+			_n_offset, _n_mask, _p_offset, _p_mask) \
+	{ \
+		.name = # _name, \
+		.reg_offset = _reg_off, \
+		.dcycle_offset = _d_offset, \
+		.dcycle_maskbits = _d_mask, \
+		.ndrive_offset = _n_offset, \
+		.ndrive_maskbits = _n_mask, \
+		.pdrive_offset = _p_offset, \
+		.pdrive_maskbits = _p_mask, \
+	}
+
+#define RTK_PIN_FUNC(_mux_val, _name) \
+	{ \
+		.name = _name, \
+		.mux_value = _mux_val, \
+	}
+
+struct rtd_pinctrl_desc {
+	const struct pinctrl_pin_desc *pins;
+	unsigned int num_pins;
+	const struct rtd_pin_group_desc *groups;
+	unsigned int num_groups;
+	const struct rtd_pin_func_desc *functions;
+	unsigned int num_functions;
+	const struct rtd_pin_desc *muxes;
+	unsigned int num_muxes;
+	const struct rtd_pin_config_desc *configs;
+	unsigned int num_configs;
+	const struct rtd_pin_sconfig_desc *sconfigs;
+	unsigned int num_sconfigs;
+	struct rtd_pin_reg_list *lists;
+	unsigned int num_regs;
+};
+
+int rtd_pinctrl_probe(struct platform_device *pdev, const struct rtd_pinctrl_desc *desc);