[PATCH RFC v2 2/5] pinctrl: mediatek: moore: Expose more configurations to GPIO set_config

["Nícolas F. R. A. Prado" <nfraprado@collabora.com>]

Currently the set_config callback in the gpio_chip registered by the
pinctrl_moore driver only supports configuring a single parameter on
specific pins (the input debounce of the EINT controller, on pins that
support it), even though many other configurations are already
implemented and available through the pinctrl API for configuration of
pins by the Devicetree and other drivers.

Expose all configurations currently implemented through the GPIO API so
they can also be set from userspace, which is particularly useful to
allow testing them from userspace.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
---
 drivers/pinctrl/mediatek/pinctrl-moore.c | 283 ++++++++++++++++---------------
 1 file changed, 144 insertions(+), 139 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c
index aad4891223d3e060431a990bfabb6bd2cbb82087..de3494e9f228cef7f2eadf6a6ea2b3b708f1fb25 100644
--- a/drivers/pinctrl/mediatek/pinctrl-moore.c
+++ b/drivers/pinctrl/mediatek/pinctrl-moore.c
@@ -246,156 +246,160 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
-static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
-			   unsigned long *configs, unsigned int num_configs)
+static int mtk_moore_pin_config_set(struct mtk_pinctrl *hw, unsigned int pin,
+				    enum pin_config_param param, u32 arg)
 {
-	struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
 	const struct mtk_pin_desc *desc;
-	u32 reg, param, arg;
-	int cfg, err = 0;
+	u32 reg;
+	int err = 0;
 
 	desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
 	if (!desc->name)
 		return -ENOTSUPP;
 
-	for (cfg = 0; cfg < num_configs; cfg++) {
-		param = pinconf_to_config_param(configs[cfg]);
-		arg = pinconf_to_config_argument(configs[cfg]);
-
-		switch (param) {
-		case PIN_CONFIG_BIAS_DISABLE:
-			if (hw->soc->bias_set_combo) {
-				err = hw->soc->bias_set_combo(hw, desc, 0, MTK_DISABLE);
-				if (err)
-					return err;
-			} else if (hw->soc->bias_disable_set) {
-				err = hw->soc->bias_disable_set(hw, desc);
-				if (err)
-					return err;
-			} else {
-				return -ENOTSUPP;
-			}
-			break;
-		case PIN_CONFIG_BIAS_PULL_UP:
-			if (hw->soc->bias_set_combo) {
-				err = hw->soc->bias_set_combo(hw, desc, 1, arg);
-				if (err)
-					return err;
-			} else if (hw->soc->bias_set) {
-				err = hw->soc->bias_set(hw, desc, 1);
-				if (err)
-					return err;
-			} else {
-				return -ENOTSUPP;
-			}
-			break;
-		case PIN_CONFIG_BIAS_PULL_DOWN:
-			if (hw->soc->bias_set_combo) {
-				err = hw->soc->bias_set_combo(hw, desc, 0, arg);
-				if (err)
-					return err;
-			} else if (hw->soc->bias_set) {
-				err = hw->soc->bias_set(hw, desc, 0);
-				if (err)
-					return err;
-			} else {
-				return -ENOTSUPP;
-			}
-			break;
-		case PIN_CONFIG_OUTPUT_ENABLE:
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
-					       MTK_DISABLE);
-			if (err)
-				goto err;
-
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
-					       MTK_OUTPUT);
+	switch ((u32)param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		if (hw->soc->bias_set_combo) {
+			err = hw->soc->bias_set_combo(hw, desc, 0, MTK_DISABLE);
 			if (err)
-				goto err;
-			break;
-		case PIN_CONFIG_INPUT_ENABLE:
-
-			if (hw->soc->ies_present) {
-				mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES,
-						 MTK_ENABLE);
-			}
-
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
-					       MTK_INPUT);
+				return err;
+		} else if (hw->soc->bias_disable_set) {
+			err = hw->soc->bias_disable_set(hw, desc);
 			if (err)
-				goto err;
-			break;
-		case PIN_CONFIG_SLEW_RATE:
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR,
-					       arg);
+				return err;
+		} else {
+			return -ENOTSUPP;
+		}
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		if (hw->soc->bias_set_combo) {
+			err = hw->soc->bias_set_combo(hw, desc, 1, arg);
 			if (err)
-				goto err;
-
-			break;
-		case PIN_CONFIG_OUTPUT:
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
-					       MTK_OUTPUT);
+				return err;
+		} else if (hw->soc->bias_set) {
+			err = hw->soc->bias_set(hw, desc, 1);
 			if (err)
-				goto err;
-
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
-					       arg);
+				return err;
+		} else {
+			return -ENOTSUPP;
+		}
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		if (hw->soc->bias_set_combo) {
+			err = hw->soc->bias_set_combo(hw, desc, 0, arg);
 			if (err)
-				goto err;
-			break;
-		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
-			/* arg = 1: Input mode & SMT enable ;
-			 * arg = 0: Output mode & SMT disable
-			 */
-			arg = arg ? 2 : 1;
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
-					       arg & 1);
+				return err;
+		} else if (hw->soc->bias_set) {
+			err = hw->soc->bias_set(hw, desc, 0);
 			if (err)
-				goto err;
+				return err;
+		} else {
+			return -ENOTSUPP;
+		}
+		break;
+	case PIN_CONFIG_OUTPUT_ENABLE:
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_DISABLE);
+		if (err)
+			return err;
+
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_OUTPUT);
+		if (err)
+			return err;
+		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+
+		if (hw->soc->ies_present) {
+			mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES, MTK_ENABLE);
+		}
+
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_INPUT);
+		if (err)
+			return err;
+		break;
+	case PIN_CONFIG_SLEW_RATE:
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR, arg);
+		if (err)
+			return err;
+
+		break;
+	case PIN_CONFIG_OUTPUT:
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_OUTPUT);
+		if (err)
+			return err;
+
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, arg);
+		if (err)
+			return err;
+		break;
+	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+		/* arg = 1: Input mode & SMT enable ;
+		 * arg = 0: Output mode & SMT disable
+		 */
+		arg = arg ? 2 : 1;
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, arg & 1);
+		if (err)
+			return err;
 
-			err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
-					       !!(arg & 2));
+		err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, !!(arg & 2));
+		if (err)
+			return err;
+		break;
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		if (hw->soc->drive_set) {
+			err = hw->soc->drive_set(hw, desc, arg);
 			if (err)
-				goto err;
-			break;
-		case PIN_CONFIG_DRIVE_STRENGTH:
-			if (hw->soc->drive_set) {
-				err = hw->soc->drive_set(hw, desc, arg);
-				if (err)
-					return err;
-			} else {
-				err = -ENOTSUPP;
-			}
-			break;
-		case MTK_PIN_CONFIG_TDSEL:
-		case MTK_PIN_CONFIG_RDSEL:
-			reg = (param == MTK_PIN_CONFIG_TDSEL) ?
-			       PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
-
-			err = mtk_hw_set_value(hw, desc, reg, arg);
+				return err;
+		} else {
+			return -ENOTSUPP;
+		}
+		break;
+	case MTK_PIN_CONFIG_TDSEL:
+	case MTK_PIN_CONFIG_RDSEL:
+		reg = (param == MTK_PIN_CONFIG_TDSEL) ?
+		       PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
+
+		err = mtk_hw_set_value(hw, desc, reg, arg);
+		if (err)
+			return err;
+		break;
+	case MTK_PIN_CONFIG_PU_ADV:
+	case MTK_PIN_CONFIG_PD_ADV:
+		if (hw->soc->adv_pull_set) {
+			bool pullup;
+
+			pullup = param == MTK_PIN_CONFIG_PU_ADV;
+			err = hw->soc->adv_pull_set(hw, desc, pullup, arg);
 			if (err)
-				goto err;
-			break;
-		case MTK_PIN_CONFIG_PU_ADV:
-		case MTK_PIN_CONFIG_PD_ADV:
-			if (hw->soc->adv_pull_set) {
-				bool pullup;
-
-				pullup = param == MTK_PIN_CONFIG_PU_ADV;
-				err = hw->soc->adv_pull_set(hw, desc, pullup,
-							    arg);
-				if (err)
-					return err;
-			} else {
-				return -ENOTSUPP;
-			}
-			break;
-		default:
-			err = -ENOTSUPP;
+				return err;
+		} else {
+			return -ENOTSUPP;
 		}
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+			   unsigned long *configs, unsigned int num_configs)
+{
+	struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	int cfg, err = 0;
+	u32 arg;
+
+	for (cfg = 0; cfg < num_configs; cfg++) {
+		param = pinconf_to_config_param(configs[cfg]);
+		arg = pinconf_to_config_argument(configs[cfg]);
+
+		err = mtk_moore_pin_config_set(hw, pin, param, arg);
+		if (err)
+			return err;
 	}
-err:
-	return err;
+
+	return 0;
 }
 
 static int mtk_pinconf_group_get(struct pinctrl_dev *pctldev,
@@ -539,20 +543,21 @@ static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 {
 	struct mtk_pinctrl *hw = gpiochip_get_data(chip);
 	const struct mtk_pin_desc *desc;
-	u32 debounce;
+	enum pin_config_param param = pinconf_to_config_param(config);
+	u32 arg = pinconf_to_config_argument(config);
 
 	desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
 	if (!desc->name)
 		return -ENOTSUPP;
 
-	if (!hw->eint ||
-	    pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE ||
-	    desc->eint.eint_n == (u16)EINT_NA)
-		return -ENOTSUPP;
+	if (param == PIN_CONFIG_INPUT_DEBOUNCE) {
+		if (!hw->eint || desc->eint.eint_n == (u16)EINT_NA)
+			return -ENOTSUPP;
 
-	debounce = pinconf_to_config_argument(config);
+		return mtk_eint_set_debounce(hw->eint, desc->eint.eint_n, arg);
+	}
 
-	return mtk_eint_set_debounce(hw->eint, desc->eint.eint_n, debounce);
+	return mtk_moore_pin_config_set(hw, offset, param, arg);
 }
 
 static int mtk_build_gpiochip(struct mtk_pinctrl *hw)

-- 
2.47.0