linux-kernel - Re: gpio-pxa: getting GPIOs by devicetree phandle broken

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Date:	Tue, 10 Feb 2015 14:33:04 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	"Holmberg, Hans" <hans.holmberg@...el.com>,
	Tyler Hall <tylerwhall@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Daniel Mack <zonque@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Howard Cochran <cochran@...mark.com>
Subject: Re: gpio-pxa: getting GPIOs by devicetree phandle broken

On Tue, Feb 10, 2015 at 2:38 AM, Robert Jarzmik <robert.jarzmik@...e.fr> wrote:
> Tyler Hall <tylerwhall@...il.com> writes:
>
>>> The issue with multiple gpiochips per of-node could be worked around as followed I believe, comments?
>>>
>>> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
>>> index 08261f2..43984ab 100644
>>> --- a/drivers/gpio/gpiolib-of.c
>>> +++ b/drivers/gpio/gpiolib-of.c
>>> @@ -47,11 +47,12 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
>>>         ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
>>>         if (ret < 0) {
>>>                 /* We've found the gpio chip, but the translation failed.
>>> -                * Return true to stop looking and return the translation
>>> -                * error via out_gpio
>>> +                * Store translation error in out_gpio.
>>> +                * Return false to keep looking, as more than one GPIO chip
>>> +                * could be registered per of-node.
>>>                  */
>>>                 gg_data->out_gpio = ERR_PTR(ret);
>>> -               return true;
>>> +               return false;
>>>          }
>>>
>>>         gg_data->out_gpio = gpiochip_get_desc(gc, ret);
>>
>> As long as we're ok with multiple gpiochips per of-node, this would
>> work for me. It'll change the preference of which chip returns the
>> error in the case of multiple chips, but that's already undefined
>> behavior.
>
> Looks good to me too, this will solve my issue, and the global behavior would be
> consistent with the former one.
>
> Would you care submitting a proper patch so that we can apply our Reviewed-by,
> Tested-by etc ... ?

Looks ok to me too, if only a little bit hackish. A patch would be
appreciated so we can send it for -fixes as well.
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