linux-kernel - Re: [PATCH] i2c: s3c2410: check for NULL pinctrl handle

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Date:	Sun, 24 Feb 2013 01:47:49 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-i2c@...r.kernel.org,
	Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH] i2c: s3c2410: check for NULL pinctrl handle

On Sun, Feb 24, 2013 at 1:38 AM, Tomasz Figa <tomasz.figa@...il.com> wrote:

> The driver must know whether pin control is available, because it has to
> fall back to legacy GPIO-based pin configuration if it is not. This means
> that we must either check for NULL (which probably is not right, since
> returned handle is considered to be opaque) or pin control core must
> return an error code specific to this situation, e.g. -ENODEV.

OK so pass a flag like a bool in your platform data from the
machine like go into <linux/platform_data/i2c-s3c2410.h>
and add:

struct s3c2410_platform_i2c {
        bool  use_that_old_gpio_interface;
        (...)
};

Instead of trying to semi-guess if the pinctrl framework is there?

Surely you know this when setting up the pdata from your machine?

Yours,
Linus Walleij
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