linux-kernel - Re: [PATCH v2 2/2] usb: typec: mux: gpio-sbu: Make enable gpio optional

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Date: Mon, 3 Jun 2024 13:38:03 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>
Subject: Re: [PATCH v2 2/2] usb: typec: mux: gpio-sbu: Make enable gpio
 optional

On Mon, Jun 03, 2024 at 10:35:58AM +0200, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@...adex.com>
> 
> The enable gpio is not required when the SBU mux is used only for
> orientation, make it optional.
> 
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> v2:
>  - removed useless NULL check for optional enable gpio
> ---
>  drivers/usb/typec/mux/gpio-sbu-mux.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/mux/gpio-sbu-mux.c b/drivers/usb/typec/mux/gpio-sbu-mux.c
> index 374168482d36..8902102c05a8 100644
> --- a/drivers/usb/typec/mux/gpio-sbu-mux.c
> +++ b/drivers/usb/typec/mux/gpio-sbu-mux.c
> @@ -66,6 +66,9 @@ static int gpio_sbu_mux_set(struct typec_mux_dev *mux,
>  {
>  	struct gpio_sbu_mux *sbu_mux = typec_mux_get_drvdata(mux);
>  
> +	if (!sbu_mux->enable_gpio)
> +		return -EOPNOTSUPP;
> +
>  	mutex_lock(&sbu_mux->lock);
>  
>  	switch (state->mode) {
> @@ -102,7 +105,8 @@ static int gpio_sbu_mux_probe(struct platform_device *pdev)
>  
>  	mutex_init(&sbu_mux->lock);
>  
> -	sbu_mux->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
> +	sbu_mux->enable_gpio = devm_gpiod_get_optional(dev, "enable",
> +						       GPIOD_OUT_LOW);
>  	if (IS_ERR(sbu_mux->enable_gpio))
>  		return dev_err_probe(dev, PTR_ERR(sbu_mux->enable_gpio),
>  				     "unable to acquire enable gpio\n");
> -- 
> 2.39.2

-- 
heikki