linux-kernel - Re: [PATCH] pinctrl: msm: Actually use function 0 for gpio selection

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Message-ID: <20181002084740.GA5499@centauri.lan>
Date:   Tue, 2 Oct 2018 10:47:40 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-gpio@...r.kernel.org, Doug Anderson <dianders@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH] pinctrl: msm: Actually use function 0 for gpio selection

On Mon, Oct 01, 2018 at 02:49:05PM -0700, Stephen Boyd wrote:
> This code needs to select function #0, which is the first int in the
> array of functions, not the number 0 which may or may not be the
> function for "GPIO mode" per the enum mapping. We were getting lucky on
> SDM845, where this was tested, because the function 0 matched the enum
> value for "GPIO mode". On other platforms, e.g. MSM8996, the gpio enum
> value is the last one in the list so this code doesn't work and we see a
> warning at boot. Fix it by grabbing the first element out of the array
> of functions.
> 
> Cc: Doug Anderson <dianders@...omium.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Niklas Cassel <niklas.cassel@...aro.org>
> Reported-by: Niklas Cassel <niklas.cassel@...aro.org>
> Fixes: 1de7ddb3a15c ("pinctrl: msm: Mux out gpio function with gpio_request()")
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

Tested-by: Niklas Cassel <niklas.cassel@...aro.org>