[PATCH v4 3/3] pinctrl: mediatek: add support for different types of IO pins

[Sam Shih]

There are many pins in an SoC, and register usage may vary by pins.
This patch introduces a concept of "io type" and "io type group"
to mediatek pinctrl drivers. This can provide different pinconf
handlers implementation (eg: "bias-pull-up/down", "driving" and
"input-enable") for IO pins that belong to different types.

Signed-off-by: Sam Shih <sam.shih at mediatek.com>
---
v4: fix mt8518_ap1_emmc build fail
v3: fix v2 patch series misapplied
v2: fix build fail caused by patch [2/3]
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 48 +++++++++++++++++--
 drivers/pinctrl/mediatek/pinctrl-mtk-common.h | 38 ++++++++++++++-
 2 files changed, 81 insertions(+), 5 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index ebab43e50a..47e2d67426 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -219,6 +219,25 @@ static int mtk_hw_get_value(struct udevice *dev, int pin, int field,
 	return 0;
 }
 
+#if CONFIG_IS_ENABLED(PINCONF)
+static int mtk_get_pin_io_type(struct udevice *dev, int pin,
+			       struct mtk_io_type_desc *io_type)
+{
+	struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
+	u8 io_n = priv->soc->pins[pin].io_n;
+
+	if (io_n >= priv->soc->ntype)
+		return -EINVAL;
+
+	io_type->name = priv->soc->io_type[io_n].name;
+	io_type->bias_set = priv->soc->io_type[io_n].bias_set;
+	io_type->drive_set = priv->soc->io_type[io_n].drive_set;
+	io_type->input_enable = priv->soc->io_type[io_n].input_enable;
+
+	return 0;
+}
+#endif
+
 static int mtk_get_groups_count(struct udevice *dev)
 {
 	struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
@@ -416,16 +435,25 @@ int mtk_pinconf_bias_set(struct udevice *dev, u32 pin, u32 arg, u32 val)
 {
 	int err;
 	struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
+	struct mtk_io_type_desc io_type;
 	int rev = priv->soc->rev;
 	bool disable, pullup;
 
 	disable = (arg == PIN_CONFIG_BIAS_DISABLE);
 	pullup = (arg == PIN_CONFIG_BIAS_PULL_UP);
 
-	if (rev == MTK_PINCTRL_V0)
+	if (!mtk_get_pin_io_type(dev, pin, &io_type)) {
+		if (io_type.bias_set)
+			err = io_type.bias_set(dev, pin, disable, pullup,
+					       val);
+		else
+			err = -EINVAL;
+
+	} else if (rev == MTK_PINCTRL_V0) {
 		err = mtk_pinconf_bias_set_v0(dev, pin, disable, pullup, val);
-	else
+	} else {
 		err = mtk_pinconf_bias_set_v1(dev, pin, disable, pullup, val);
+	}
 
 	return err;
 }
@@ -447,8 +475,13 @@ int mtk_pinconf_input_enable_v1(struct udevice *dev, u32 pin, u32 arg)
 int mtk_pinconf_input_enable(struct udevice *dev, u32 pin, u32 arg)
 {
 	struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
+	struct mtk_io_type_desc io_type;
+
 	int rev = priv->soc->rev;
 
+	if (!mtk_get_pin_io_type(dev, pin, &io_type))
+		if (io_type.input_enable)
+			return io_type.input_enable(dev, pin, arg);
 	if (rev == MTK_PINCTRL_V1)
 		return mtk_pinconf_input_enable_v1(dev, pin, arg);
 
@@ -505,12 +538,19 @@ int mtk_pinconf_drive_set(struct udevice *dev, u32 pin, u32 arg)
 {
 	int err;
 	struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
+	struct mtk_io_type_desc io_type;
 	int rev = priv->soc->rev;
 
-	if (rev == MTK_PINCTRL_V0)
+	if (!mtk_get_pin_io_type(dev, pin, &io_type)) {
+		if (io_type.drive_set)
+			err = io_type.drive_set(dev, pin, arg);
+		else
+			err = -EINVAL;
+	} else if (rev == MTK_PINCTRL_V0) {
 		err = mtk_pinconf_drive_set_v0(dev, pin, arg);
-	else
+	} else {
 		err = mtk_pinconf_drive_set_v1(dev, pin, arg);
+	}
 
 	return err;
 }
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
index 91a8c0581f..0d9596fa72 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
@@ -12,10 +12,15 @@
 #define MAX_BASE_CALC 10
 
 #define MTK_RANGE(_a)		{ .range = (_a), .nranges = ARRAY_SIZE(_a), }
-#define MTK_PIN(_number, _name, _drv_n) {				\
+
+#define MTK_PIN(_number, _name, _drv_n)					\
+	MTK_TYPED_PIN(_number, _name, _drv_n, IO_TYPE_DEFAULT)
+
+#define MTK_TYPED_PIN(_number, _name, _drv_n, _io_n) {			\
 		.number = _number,					\
 		.name = _name,						\
 		.drv_n = _drv_n,					\
+		.io_n = _io_n,						\
 	}
 
 #define PINCTRL_PIN_GROUP(name, id)					\
@@ -75,6 +80,18 @@ enum {
 	DRV_GRP4,
 };
 
+/* Group the pins by the io type */
+enum {
+	IO_TYPE_DEFAULT,
+	IO_TYPE_GRP0,
+	IO_TYPE_GRP1,
+	IO_TYPE_GRP2,
+	IO_TYPE_GRP3,
+	IO_TYPE_GRP4,
+	IO_TYPE_GRP5,
+	IO_TYPE_GRP6,
+};
+
 /**
  * struct mtk_pin_field - the structure that holds the information of the field
  *			  used to describe the attribute for the pin
@@ -139,11 +156,13 @@ struct mtk_pin_reg_calc {
  * @number:		unique pin number from the global pin number space
  * @name:		name for this pin
  * @drv_n:		the index with the driving group
+ * @io_n:		the index with the io type
  */
 struct mtk_pin_desc {
 	unsigned int number;
 	const char *name;
 	u8 drv_n;
+	u8 io_n;
 };
 
 /**
@@ -172,6 +191,21 @@ struct mtk_function_desc {
 	int num_group_names;
 };
 
+/**
+ * struct mtk_io_type_desc - io class descriptor for specific pins
+ * @name: name of the io class
+ */
+struct mtk_io_type_desc {
+	const char *name;
+#if CONFIG_IS_ENABLED(PINCONF)
+	/* Specific pinconfig operations */
+	int (*bias_set)(struct udevice *dev, u32 pin, bool disable,
+			bool pullup, u32 val);
+	int (*drive_set)(struct udevice *dev, u32 pin, u32 arg);
+	int (*input_enable)(struct udevice *dev, u32 pin, u32 arg);
+#endif
+};
+
 /* struct mtk_pin_soc - the structure that holds SoC-specific data */
 struct mtk_pinctrl_soc {
 	const char *name;
@@ -182,6 +216,8 @@ struct mtk_pinctrl_soc {
 	int ngrps;
 	const struct mtk_function_desc *funcs;
 	int nfuncs;
+	const struct mtk_io_type_desc *io_type;
+	u8 ntype;
 	int gpio_mode;
 	const char * const *base_names;
 	unsigned int nbase_names;
-- 
2.18.0