linux-kernel - Re: [PATCH 2/4] pinctrl: samsung: Register pinctrl before GPIO

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Date:   Wed, 15 Feb 2017 19:36:22 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:     linus.walleij@...aro.org, tomasz.figa@...il.com,
        s.nawrocki@...sung.com, linux-gpio@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH 2/4] pinctrl: samsung: Register pinctrl before GPIO

On Mon, Feb 13, 2017 at 10:11:04AM +0000, Charles Keepax wrote:
> If we request a GPIO hog, then gpiochip_add_data will attempt to request
> some of its own GPIOs. The driver also uses gpiochip_generic_request
> which means that for any GPIO request to succeed the pinctrl needs to be
> registered. Currently however the driver registers the GPIO and then the
> pinctrl meaning all GPIO hog requests will fail, which then in turn causes
> the whole driver to fail probe. Fix this up by ensuring we register the
> pinctrl first.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/pinctrl/samsung/pinctrl-samsung.c | 32 +++++++++++++++----------------

I think the code makes sense altough the description describes
theoretical issue - we do not use GPIO hogs. Of course out of tree DTS
could use them... so maybe mention that this is not an existing case?

For the code itself:
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof


>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
> index d79eada..1134bc3 100644
> --- a/drivers/pinctrl/samsung/pinctrl-samsung.c
> +++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
> @@ -893,6 +893,19 @@ static int samsung_pinctrl_register(struct platform_device *pdev,
>  	return 0;
>  }
>