linux-kernel - Re: [PATCH v3 2/3] pinctrl: msm: Mux out gpio function with gpio

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Date:   Sun, 26 Aug 2018 20:06:28 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>
Subject: Re: [PATCH v3 2/3] pinctrl: msm: Mux out gpio function with
 gpio_request()

On Thu 16 Aug 13:06 PDT 2018, Stephen Boyd wrote:

> We rely on devices to use pinmuxing configurations in DT to select the
> GPIO function (function 0) if they're going to use the gpio in GPIO
> mode. Let's simplify things for driver authors by implementing
> gpio_request_enable() for this pinctrl driver to mux out the GPIO
> function when the gpio is use from gpiolib.
> 
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Doug Anderson <dianders@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/pinctrl/qcom/pinctrl-msm.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 5d72ffad32c2..793504057ad0 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -176,11 +176,27 @@ static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev,
>  	return 0;
>  }
>  
> +static int msm_pinmux_request_gpio(struct pinctrl_dev *pctldev,
> +				   struct pinctrl_gpio_range *range,
> +				   unsigned offset)
> +{
> +	struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +	const struct msm_pingroup *g = &pctrl->soc->groups[offset];
> +
> +	/* No funcs? Probably ACPI so can't do anything here */
> +	if (!g->nfuncs)
> +		return 0;
> +
> +	/* For now assume function 0 is GPIO because it always is */
> +	return msm_pinmux_set_mux(pctldev, 0, offset);
> +}
> +
>  static const struct pinmux_ops msm_pinmux_ops = {
>  	.request		= msm_pinmux_request,
>  	.get_functions_count	= msm_get_functions_count,
>  	.get_function_name	= msm_get_function_name,
>  	.get_function_groups	= msm_get_function_groups,
> +	.gpio_request_enable	= msm_pinmux_request_gpio,
>  	.set_mux		= msm_pinmux_set_mux,
>  };
>  
> -- 
> Sent by a computer through tubes
>