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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Phil Edworthy <phil.edworthy@renesas.com>
Cc: "Stephen Boyd" <sboyd@kernel.org>,
	"Michael Turquette" <mturquette@baylibre.com>,
	"Russell King" <linux@armlinux.org.uk>,
	linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-renesas-soc@vger.kernel.org,
	"Greg Ungerer" <gerg@linux-m68k.org>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	"Ralf Baechle" <ralf@linux-mips.org>,
	"Paul Burton" <paul.burton@mips.com>,
	"James Hogan" <jhogan@kernel.org>,
	"Jiaxun Yang" <jiaxun.yang@flygoat.com>,
	"Huacai Chen" <chenhc@lemote.com>, "Guan Xuetao" <gxt@pku.edu.cn>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	linux-m68k@lists.linux-m68k.org, linux-mips@linux-mips.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] clk: Add (devm_)clk_get_optional() functions
Date: Tue, 20 Nov 2018 12:38:33 +0200	[thread overview]
Message-ID: <20181120103832.GV10650@smile.fi.intel.com> (raw)
In-Reply-To: <20181119141259.11992-1-phil.edworthy@renesas.com>

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



WARNING: multiple messages have this Message-ID (diff)
From: andriy.shevchenko@linux.intel.com (Andy Shevchenko)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] clk: Add (devm_)clk_get_optional() functions
Date: Tue, 20 Nov 2018 12:38:33 +0200	[thread overview]
Message-ID: <20181120103832.GV10650@smile.fi.intel.com> (raw)
In-Reply-To: <20181119141259.11992-1-phil.edworthy@renesas.com>

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

  reply	other threads:[~2018-11-20 10:38 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-19 14:12 [PATCH] clk: Add (devm_)clk_get_optional() functions Phil Edworthy
2018-11-19 14:12 ` Phil Edworthy
2018-11-20 10:38 ` Andy Shevchenko [this message]
2018-11-20 10:38   ` Andy Shevchenko
2018-11-20 10:53   ` Phil Edworthy
2018-11-20 10:53     ` Phil Edworthy
2018-11-20 11:12     ` Andy Shevchenko
2018-11-20 11:12       ` Andy Shevchenko
2018-11-20 12:56   ` Uwe Kleine-König
2018-11-20 12:56     ` Uwe Kleine-König
2018-11-20 12:56     ` Uwe Kleine-König
2018-11-20 13:26     ` Andy Shevchenko
2018-11-20 13:26       ` Andy Shevchenko
2018-11-20 13:26       ` Andy Shevchenko

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