linux-kernel - Re: [PATCH 1/4] mfd: wm8994: Fix driver operation if loaded as modules

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Message-ID: <20200428103702.GQ3559@dell>
Date:   Tue, 28 Apr 2020 11:37:02 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH 1/4] mfd: wm8994: Fix driver operation if loaded as
 modules

On Mon, 27 Apr 2020, Marek Szyprowski wrote:

> WM8994 chip has built-in regulators, which might be used for chip
> operation. They are controlled by a separate wm8994-regulator driver,
> which should be loaded before this driver calls regulator_get(), because
> that driver also provides consumer-supply mapping for the them. If that
> driver is not yet loaded, regulator core substitute them with dummy
> regulator, what breaks chip operation, because the built-in regulators are
> never enabled. Fix this by annotating this driver with MODULE_SOFTDEP()
> "pre" dependency to "wm8994_regulator" module.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> ---
>  drivers/mfd/wm8994-core.c | 1 +
>  1 file changed, 1 insertion(+)

For my own reference (apply this as-is to your sign-off block):

  Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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