[PATCH v3] pinctrl: meson: support gpio toggle command

[Neil Armstrong]

On 16/06/2025 19:01, Yang Xiwen via B4 Relay wrote:
> From: Yang Xiwen <forbidden405 at outlook.com>
> 
> meson_gpio_get() always assumes gpio is configured to input mode. This
> is incorrect and breaks `gpio toggle` command:
> 
> gpio: pin aobus-banks2 (gpio 2) value is 0
>     Warning: value of pin is still 1
> 
> Fix it by adding the logic to handle both input and output mode.
> 
> Fixes: 2009a8d03fe5 ("pinctrl: meson: add GPIO support")
> Signed-off-by: Yang Xiwen <forbidden405 at outlook.com>
> ---
> Changes in v3:
> - remove unused reg_type assignment.
> - Link to v2: https://lore.kernel.org/r/20250617-meson_ppinctrl-v2-1-16d1cb294ef4@outlook.com
> 
> Changes in v2:
> - return -EINVAL directly in case of error. (Neil Armstrong <neil.armstrong at linaro.org>)
> - Link to v1: https://lore.kernel.org/r/20250617-meson_ppinctrl-v1-1-593aa15f288a@outlook.com
> ---
>   drivers/pinctrl/meson/pinctrl-meson.c | 20 +++++++++++++++++++-
>   1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
> index babf1bccc969..7dbaf966f93f 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
> @@ -117,8 +117,26 @@ int meson_gpio_get(struct udevice *dev, unsigned int offset)
>   	struct meson_pinctrl *priv = dev_get_priv(dev->parent);
>   	unsigned int reg, bit;
>   	int ret;
> +	enum gpio_func_t direction;
> +	enum meson_reg_type reg_type;
>   
> -	ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_IN, &reg,
> +	direction = meson_gpio_get_direction(dev, offset);
> +
> +	switch (direction) {
> +	case GPIOF_INPUT:
> +		reg_type = REG_IN;
> +		break;
> +
> +	case GPIOF_OUTPUT:
> +		reg_type = REG_OUT;
> +		break;
> +
> +	default:
> +		dev_warn(dev, "Failed to get current direction of Pin %u\n", offset);
> +		return -EINVAL;
> +	}
> +
> +	ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, reg_type, &reg,
>   					  &bit);
>   	if (ret)
>   		return ret;
> 
> ---
> base-commit: c5afa1fef49f55146e78d6157470520391c40eca
> change-id: 20250617-meson_ppinctrl-5139ca06b828
> 
> Best regards,

Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>