linux-kernel - Re: [PATCH] clk: Add functions to get optional clocks

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Message-ID: <20180718130228.GG17271@n2100.armlinux.org.uk>
Date:   Wed, 18 Jul 2018 14:02:28 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Phil Edworthy <phil.edworthy@...esas.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Simon Horman <horms@...ge.net.au>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: Add functions to get optional clocks

On Wed, Jul 18, 2018 at 01:57:38PM +0100, Phil Edworthy wrote:
> Behaves the same as (devm_)clk_get except where there is no clock
> producer. In this case, instead of returning -ENOENT, the function
> returns NULL. This makes error checking simpler and allows
> clk_prepare_enable, etc to be called on the returned reference
> without additional checks.

How does this work with non-DT systems, where looking a clock up which
isn't yet registered with clkdev returns -ENOENT ?

(clkdev doesn't know when all clocks are registered with it.)

-- 
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