linux-kernel - Re: [PATCH] clk: Add (devm_)clk_get

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Date:   Tue, 20 Nov 2018 12:38:33 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Phil Edworthy <phil.edworthy@...esas.com>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>, Guan Xuetao <gxt@....edu.cn>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...ux-mips.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: Add (devm_)clk_get_optional() functions

On Mon, Nov 19, 2018 at 02:12:59PM +0000, Phil Edworthy wrote:
> This adds clk_get_optional() and devm_clk_get_optional() functions to get
> optional clocks.
> They behave 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.

>  - Instead of messing with the core functions, simply wrap them for the
>    _optional() versions. By putting clk_get_optional() inline in the header
>    file, we can get rid of the arch specific patches as well.

Fine if it would have no surprises with error handling.

> +	if (ERR_PTR(-ENOENT))
> +		return NULL;
> +	else
> +		return clk;

return clk == ERR_PTR(-ENOENT) ? NULL : clk;

?

> +	if (clk == ERR_PTR(-ENOENT))
> +		return NULL;
> +	else
> +		return clk;

Ditto.


-- 
With Best Regards,
Andy Shevchenko