linux-kernel - Re: [PATCH v2] mfd: syscon: Add syscon_regmap_lookup_by_phandle

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Date:   Wed, 11 Nov 2020 11:15:41 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Collabora Kernel ML <kernel@...labora.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v2] mfd: syscon: Add syscon_regmap_lookup_by_phandle_optional()
 function.

On Tue, Nov 10, 2020 at 5:13 PM Enric Balletbo i Serra
<enric.balletbo@...labora.com> wrote:
>
> This adds syscon_regmap_lookup_by_phandle_optional() function to get an
> optional regmap.
>
> It behaves the same as syscon_regmap_lookup_by_phandle() except where
> there is no regmap phandle. In this case, instead of returning -ENODEV,
> the function returns NULL. This makes error checking simpler when the
> regmap phandle is optional.
>
> Suggested-by: Nicolas Boichat <drinkcat@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

Reviewed-by: Arnd Bergmann <arnd@...db.de>