linux-kernel - Re: [PATCH] pinctrl: freescale: avoid overwriting pin config when freeing GPIO

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Date:   Fri, 30 Sep 2016 07:52:40 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     linus.walleij@...aro.org,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Cc:     Stefan Agner <stefan@...er.ch>, shawnguo@...nel.org,
        aalonso@...escale.com, b38343@...escale.com, ldewangan@...dia.com,
        van.freenix@...il.com, p.zabel@...gutronix.de,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: freescale: avoid overwriting pin config when
 freeing GPIO

On 29-09-16, 15:16, Vladimir Zapolskiy wrote:
> If you look at the top I agree that this solution may be only one platform
> specific, but it fixes the broken driver of i.MX I2C bus controller.

Yeah, I saw that..

> Why do you get an impression that it looks like a hack?

Because we have to reorder things to make it work on a platform. This may break
things on other platforms and we don't know about it yet.

> Why pinctrl_select_state() is not done in gpio_request_one()? Because
> the first function gets pin mux/config setting and the second does not.
> How do you intend to get pin mux/config setting in gpio_request_one()?

Lets see what Linus has to say on this..

> Anyway I don't see any problems in pinctrl or gpio subsystems, the bugs
> must be addressed and fixed in i2c.

I think it can be a gpio driver specific thing as well and not really subsystem
level one.

-- 
viresh