linux-kernel - Re: [PATCHv2 2/2] gpio: mvebu: fix gpio bank registration when pwm is used

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Date:   Fri, 9 Jun 2017 09:39:23 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Richard Genoud <richard.genoud@...il.com>
Cc:     Alexandre Courbot <gnurou@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Jason Cooper <jason@...edaemon.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralph Sennhauser <ralph.sennhauser@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCHv2 2/2] gpio: mvebu: fix gpio bank registration when pwm is used

On Thu, Jun 1, 2017 at 2:18 PM, Richard Genoud <richard.genoud@...il.com> wrote:

> If more than one gpio bank has the "pwm" property, only one will be
> registered successfully, all the others will fail with:
> mvebu-gpio: probe of f1018140.gpio failed with error -17
>
> That's because in alloc_pwms(), the chip->base (aka "int pwm"), was not
> set (thus, ==0) ; and 0 is a meaningful start value in alloc_pwm().
> What was intended is mvpwm->chip->base = -1.
> Like that, the numbering will be done auto-magically
>
> Moreover, as the region might be already occupied by another pwm, we
> shouldn't force:
> mvpwm->chip->base = 0
> nor
> mvpwm->chip->base = id * MVEBU_MAX_GPIO_PER_BANK;
>
> Tested on clearfog-pro (Marvell 88F6828)
>
> Fixes: 757642f9a584 ("gpio: mvebu: Add limited PWM support")
> Signed-off-by: Richard Genoud <richard.genoud@...il.com>

Patch applied for fixes with Gregory's review tag.

Yours,
Linus Walleij