From: Tzuyi Chang <tychang@realtek.com>

Add support for configuring slew rate, input voltage level and high VIL
mode. This involves updating the pin configuration parsing logic to handle
PIN_CONFIG_SLEW_RATE, PIN_CONFIG_INPUT_VOLTAGE_UV and the new custom
property "realtek,high-vil-microvolt".

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Co-developed-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
---
Changes in v4:
- Add Reviewed-by tag from Linus.
---
 drivers/pinctrl/realtek/pinctrl-rtd.c | 66 ++++++++++++++++++++++++++-
 drivers/pinctrl/realtek/pinctrl-rtd.h |  3 ++
 2 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/realtek/pinctrl-rtd.c b/drivers/pinctrl/realtek/pinctrl-rtd.c
index 16cee851393e..ec266c5b7fa1 100644
--- a/drivers/pinctrl/realtek/pinctrl-rtd.c
+++ b/drivers/pinctrl/realtek/pinctrl-rtd.c
@@ -37,11 +37,13 @@ struct rtd_pinctrl {
 #define RTD_DRIVE_STRENGH_P (PIN_CONFIG_END + 1)
 #define RTD_DRIVE_STRENGH_N (PIN_CONFIG_END + 2)
 #define RTD_DUTY_CYCLE (PIN_CONFIG_END + 3)
+#define RTD_HIGH_VIL (PIN_CONFIG_END + 4)
 
 static const struct pinconf_generic_params rtd_custom_bindings[] = {
 	{"realtek,drive-strength-p", RTD_DRIVE_STRENGH_P, 0},
 	{"realtek,drive-strength-n", RTD_DRIVE_STRENGH_N, 0},
 	{"realtek,duty-cycle", RTD_DUTY_CYCLE, 0},
+	{"realtek,high-vil-microvolt", RTD_HIGH_VIL, 0},
 };
 
 static int rtd_pinctrl_get_groups_count(struct pinctrl_dev *pcdev)
@@ -288,7 +290,8 @@ static int rtd_pconf_parse_conf(struct rtd_pinctrl *data,
 	u16 strength;
 	u32 val;
 	u32 mask;
-	u32 pulsel_off, pulen_off, smt_off, curr_off, pow_off, reg_off, p_off, n_off;
+	u32 pulsel_off, pulen_off, smt_off, curr_off, pow_off, reg_off, p_off, n_off,
+	    input_volt_off, sr_off, hvil_off;
 	const char *name = data->info->pins[pinnr].name;
 	int ret = 0;
 
@@ -409,6 +412,67 @@ static int rtd_pconf_parse_conf(struct rtd_pinctrl *data,
 		val = set_val ? mask : 0;
 		break;
 
+	case PIN_CONFIG_SLEW_RATE:
+		if (config_desc->slew_rate_offset == NA) {
+			dev_err(data->dev, "Slew rate setting unsupported for pin: %s\n", name);
+			return -ENOTSUPP;
+		}
+
+		switch (arg) {
+		case 1:
+			set_val = 0;
+			break;
+		case 10:
+			set_val = 1;
+			break;
+		case 20:
+			set_val = 2;
+			break;
+		case 30:
+			set_val = 3;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		sr_off = config_desc->base_bit + config_desc->slew_rate_offset;
+		reg_off = config_desc->reg_offset;
+		mask = 0x3 << sr_off;
+		val = arg << sr_off;
+		break;
+
+	case PIN_CONFIG_INPUT_VOLTAGE_UV:
+		if (config_desc->input_volt_offset == NA) {
+			dev_err(data->dev, "Input voltage level setting unsupported for pin:%s\n",
+				name);
+			return -ENOTSUPP;
+		}
+
+		if (arg == 3300000)
+			set_val = 1;
+		else if (arg == 1800000)
+			set_val = 0;
+		else
+			return -EINVAL;
+
+		input_volt_off = config_desc->base_bit + config_desc->input_volt_offset;
+		reg_off = config_desc->reg_offset;
+
+		mask = BIT(input_volt_off);
+		val = set_val ? BIT(input_volt_off) : 0;
+		break;
+
+	case RTD_HIGH_VIL:
+		if (config_desc->hvil_offset == NA) {
+			dev_err(data->dev, "High vil setting unsupported for pin:%s\n", name);
+			return -ENOTSUPP;
+		}
+		hvil_off = config_desc->base_bit + config_desc->hvil_offset;
+		reg_off = config_desc->reg_offset;
+		mask = BIT(hvil_off);
+		val = 1;
+		break;
+
 	case RTD_DRIVE_STRENGH_P:
 		sconfig_desc = rtd_pinctrl_find_sconfig(data, pinnr);
 		if (!sconfig_desc) {
diff --git a/drivers/pinctrl/realtek/pinctrl-rtd.h b/drivers/pinctrl/realtek/pinctrl-rtd.h
index 7fb0955ce749..02e2d8d269b5 100644
--- a/drivers/pinctrl/realtek/pinctrl-rtd.h
+++ b/drivers/pinctrl/realtek/pinctrl-rtd.h
@@ -34,6 +34,9 @@ struct rtd_pin_config_desc {
 	unsigned int smt_offset;
 	unsigned int power_offset;
 	unsigned int curr_type;
+	unsigned int input_volt_offset;
+	unsigned int slew_rate_offset;
+	unsigned int hvil_offset;
 };
 
 struct rtd_pin_sconfig_desc {
-- 
2.34.1