linux-kernel - Re: [PATCH 0/4 v4] pin controller subsystem v4

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Date:	Fri, 26 Aug 2011 09:58:39 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Stephen Warren <swarren@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	Joe Perches <joe@...ches.com>,
	Linaro Dev <linaro-dev@...ts.linaro.org>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 0/4 v4] pin controller subsystem v4

2011/8/22 Linus Walleij <linus.walleij@...aro.org>:
> On Sun, Aug 21, 2011 at 4:42 PM, Barry Song <21cnbao@...il.com> wrote:
>
>> it seems there is not an actual example that gpio requests pin from
>> pinctrl yet. i might give one on SiRFprimaII.
>
> No good example yet, no.
>
> The reason is that for the U300 that I use as guinea pig, the
> GPIO driver is tangled up in discussions about how to handle
> the special control mechanics like requesting muxing and
> biasing pins. Right now it seems easier to rewrite all that
> to use the new pinctrl subsystem rather than actually trying
> to work it into the GPIO subsystem first and refactor from
> there, and that needs quite a bit of upfront work...

Do you want the pinmux_request_gpio called by the gpiolib driver or by
every device driver who uses this gpio?
Do you think the following make sense in gpiolib driver?
static int xxx_gpio_request(struct gpio_chip *chip, unsigned offset)
{
        int ret = 0;

        ret = pinmux_request_gpio(chip->base + offset);
        if (ret)
                goto out;
        .....
out:
        return ret;
}


>
> Linus Walleij
>

Thanks
Barry
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