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References: <20201110161338.18198-1-enric.balletbo@collabora.com>
In-Reply-To: <20201110161338.18198-1-enric.balletbo@collabora.com>
From:   Arnd Bergmann <arnd@kernel.org>
Date:   Wed, 11 Nov 2020 11:15:41 +0100
Message-ID: <CAK8P3a2HJ6ROzMNGNc8A-qz02x0x9Aj0g0BXCe9v57ob6THk+g@mail.gmail.com>
Subject: Re: [PATCH v2] mfd: syscon: Add syscon_regmap_lookup_by_phandle_optional()
 function.
To:     Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Collabora Kernel ML <kernel@collabora.com>,
        Nicolas Boichat <drinkcat@chromium.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>, Lee Jones <lee.jones@linaro.org>
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On Tue, Nov 10, 2020 at 5:13 PM Enric Balletbo i Serra
<enric.balletbo@collabora.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@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

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