Re: [PATCH v2] pinctrl: qcom: support gpio_chip .set_config call

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Wed 03 Mar 07:18 CST 2021, Shawn Guo wrote:

> In case of ACPI boot, GPIO core does the right thing to parse GPIO pin
> configs from ACPI table, and call into gpio_chip's .set_config hook for
> setting them up.  It enables such support on qcom platform by using
> generic config function, which in turn calls into .pin_config_set of
> pinconf for setting up hardware.  For qcom platform, it's possible to
> reuse pin group config functions for pin config hooks, because every pin
> is maintained as a single group.
> 
> This change fixes the problem that Touchpad of Lenovo Flex 5G laptop
> doesn't work with ACPI boot, because PullUp config of Touchpad GpioInt
> pin is not set up by the kernel.
> 

Per Linus comment that this is how others are doing it, I guess we can
do it too...

Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> Changes for v2:
> - Add pin config functions that simply call into group config ones.
> 
>  drivers/pinctrl/qcom/pinctrl-msm.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index af6ed7f43058..a59bb4cbd97e 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -489,10 +489,24 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
>  	return 0;
>  }
>  
> +static int msm_config_pin_get(struct pinctrl_dev *pctldev, unsigned int pin,
> +			      unsigned long *config)
> +{
> +	return msm_config_group_get(pctldev, pin, config);
> +}
> +
> +static int msm_config_pin_set(struct pinctrl_dev *pctldev, unsigned pin,
> +			      unsigned long *configs, unsigned num_configs)
> +{
> +	return msm_config_group_set(pctldev, pin, configs, num_configs);
> +}
> +
>  static const struct pinconf_ops msm_pinconf_ops = {
>  	.is_generic		= true,
>  	.pin_config_group_get	= msm_config_group_get,
>  	.pin_config_group_set	= msm_config_group_set,
> +	.pin_config_get		= msm_config_pin_get,
> +	.pin_config_set		= msm_config_pin_set,
>  };
>  
>  static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> @@ -717,6 +731,7 @@ static const struct gpio_chip msm_gpio_template = {
>  	.get_direction    = msm_gpio_get_direction,
>  	.get              = msm_gpio_get,
>  	.set              = msm_gpio_set,
> +	.set_config       = gpiochip_generic_config,
>  	.request          = gpiochip_generic_request,
>  	.free             = gpiochip_generic_free,
>  	.dbg_show         = msm_gpio_dbg_show,
> -- 
> 2.17.1
>