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

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Date:   Fri, 30 Sep 2016 07:42:08 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     linus.walleij@...aro.org, Stefan Agner <stefan@...er.ch>
Cc:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        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, 09:33, Stefan Agner wrote:
> You need to differentiate between Vybrid and i.MX:
> 
> Vybrid muxes a pin to GPIO on gpio_request_one (via .gpio_request_enable
> callback)
> i.MX does not mux a pin as GPIO on its own, but needs to be muxed
> explicitly. That has been always the case...
> 
> I don't know what behavior is right, it is just "different"...

Hmm, I think What Vybrid and Tegra have done is better, but it would be better
to get inputs from Linus, which you already asked for :)

-- 
viresh