Re: [PATCH v2 2/5] mux: gpio: add optional regulator support

[Maud Spierings]

> From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
>
> Some of the external muxes needs powering up using a regulator.
> This is the case with Lenovo T14s laptop which has a external audio mux
> to handle US/EURO headsets.
>
> Add support to the driver to handle this optional regulator.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
> ---
>  drivers/mux/gpio.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
> index cc5f2c1861d4..12cd9b5c32fb 100644
> --- a/drivers/mux/gpio.c
> +++ b/drivers/mux/gpio.c
> @@ -15,6 +15,7 @@
>  #include <linux/mux/driver.h>
>  #include <linux/platform_device.h>
>  #include <linux/property.h>
> +#include <linux/regulator/consumer.h>
>  
>  struct mux_gpio {
>  	struct gpio_descs *gpios;
> @@ -82,6 +83,13 @@ static int mux_gpio_probe(struct platform_device *pdev)
>  		mux_chip->mux->idle_state = idle_state;
>  	}
>  
> +	ret = devm_regulator_get_enable_optional(dev, "mux");
> +	if (ret && ret != -ENODEV) {
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "Couldn't retrieve/enable gpio mux supply\n");
> +		return ret;
> +	}

This seems like a good place to use return dev_err_probe()

> +
>  	ret = devm_mux_chip_register(dev, mux_chip);
>  	if (ret < 0)
>  		return ret;
> --
> 2.39.5

Kind regards,
Maud