[PATCH 1/8] clk: add helper function clk_is_match()

[Shawn Guo]

On Wed, Feb 25, 2015 at 09:27:57AM -0800, Mike Turquette wrote:
> Hi Shawn,
> 
> Thanks for the patch. I wrote a similar one last night but did not
> finish fixing up the drivers (and thus did not post it). I prefer my
> implementation below, and I'm happy to merge your driver fixes with it.

Sure, no problem.  My intention was to get rmk's HummingBoard back to
work ASAP :)

> From: Michael Turquette <mturquette at linaro.org>
> Date: Wed, 25 Feb 2015 09:11:01 -0800
> Subject: [PATCH] clk: introduce clk_is_match
> 
> Some drivers compare struct clk pointers as a means of knowing
> if the two pointers reference the same clock hardware. This behavior is
> dubious (drivers must not dereference struct clk), but did not cause any
> regressions until the per-user struct clk patch was merged. Now the test
> for matching clk's will always fail with per-user struct clk's.
> 
> clk_is_match is introduced to fix the regression and prevent drivers
> from comparing the pointers manually.
> 
> Fixes: 035a61c314eb ("clk: Make clk API return per-user struct clk instances")
> Cc: Russell King <linux at arm.linux.org.uk>
> Cc: Stephen Boyd <sboyd at codeaurora.org>
> Cc: Shawn Guo <shawn.guo at linaro.org>

Tested-by: Shawn Guo <shawn.guo at linaro.org>

> Cc: Tomeu Vizoso <tomeu.vizoso at collabora.com>
> Signed-off-by: Michael Turquette <mturquette at linaro.org>