linux-kernel - Inconsistency in clk framework

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Message-ID: <1355890233.25599.4.camel@gitbox>
Date:	Wed, 19 Dec 2012 17:10:33 +1300
From:	Tony Prisk <linux@...sktech.co.nz>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	Arm Kernel Mailing List <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Inconsistency in clk framework

Hi Mike,

In attempting to remove some IS_ERR_OR_NULL references, it was pointed
out that clk_get() can return NULL if CONFIG_HAVE_CLK is not defined.

This seems to contradict the kernel docs associated with the normal
clk_get (when HAVE_CLK is defined) which states:

* Returns a struct clk corresponding to the clock producer, or
* valid IS_ERR() condition containing errno.

Wouldn't a return code of ERR_PTR(-ENOENT) make more sense and be inline
with the empty of_ versions as well (which return -ENOENT when CONFIG_OF
is undefined).

Also, I noticed that clk_get_sys() doesn't appear to be defined in clk.h
when HAVE_CLK is undefined - is this correct?

Regards
Tony Prisk

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