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@xxxxxxxxxx>
Regards,
Bjorn
> Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
> ---
> 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
>
