[v2,04/12] pinctrl: mediatek: moore: check if pin_desc is valid before use

From: Sam Shih
Date: Tue Aug 17 2021 - 03:46:44 EST


Certain SoC are missing the middle part gpios in consecutive pins,
it's better to check if mtk_pin_desc is a valid pin for the extensibility

Signed-off-by: Sam Shih <sam.shih@xxxxxxxxxxxx>

---
v2: applied the comment suggested by reviewers:
- for the pins not ballout, we can fill .name in struct mtk_pin_desc
as NULL and return -ENOTSUPP in gpio/pinconf ops.

---
drivers/pinctrl/mediatek/pinctrl-moore.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c
index 3a4a23c40a71..ad3b67163973 100644
--- a/drivers/pinctrl/mediatek/pinctrl-moore.c
+++ b/drivers/pinctrl/mediatek/pinctrl-moore.c
@@ -60,6 +60,8 @@ static int mtk_pinmux_set_mux(struct pinctrl_dev *pctldev,
int pin = grp->pins[i];

desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
+ if (!desc->name)
+ return -ENOTSUPP;

mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
pin_modes[i]);
@@ -76,6 +78,8 @@ static int mtk_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
const struct mtk_pin_desc *desc;

desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
+ if (!desc->name)
+ return -ENOTSUPP;

return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
hw->soc->gpio_m);
@@ -89,6 +93,8 @@ static int mtk_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
const struct mtk_pin_desc *desc;

desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
+ if (!desc->name)
+ return -ENOTSUPP;

/* hardware would take 0 as input direction */
return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !input);
@@ -103,6 +109,8 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
const struct mtk_pin_desc *desc;

desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
+ if (!desc->name)
+ return -ENOTSUPP;

switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
@@ -218,6 +226,8 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
int cfg, 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]);
@@ -435,6 +445,8 @@ static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
int value, err;

desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
+ if (!desc->name)
+ return -ENOTSUPP;

err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
if (err)
@@ -449,6 +461,10 @@ static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
const struct mtk_pin_desc *desc;

desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
+ if (!desc->name) {
+ dev_err(hw->dev, "Failed to set gpio %d\n", gpio);
+ return;
+ }

mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value);
}
@@ -490,6 +506,8 @@ static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
u32 debounce;

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 ||
--
2.29.2