linux-kernel - Re: [PATCH] drm/panel: lvds: Handle the optional regulator case properly

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Message-ID: <87zi5kii00.fsf@intel.com>
Date:   Thu, 11 Jan 2018 16:31:59 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] drm/panel: lvds: Handle the optional regulator case properly

On Thu, 11 Jan 2018, Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:
> My preference, however, would be for devm_regulator_get_optional() to return 
> NULL when no regulator is present. The current implementation returns -ENODEV 
> in multiple cases, making it impossible to properly discriminate between 
> having no regulator and not being able to get the regulator due to an error.

Just a word of warning, IS_ERR(NULL) is false, and your proposed change
would apparently require quite a churn all over the kernel.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center