From: Thierry Reding <treding@nvidia.com>
Date: Wed, 21 Jan 2015 16:13:00 +0000 (+0100)
Subject: clk: Introduce clk_has_parent()
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~17^2~13^2~34^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e88f3de89fbb7b5a5a0aca20376b276d26732ac;p=pandora-kernel.git

clk: Introduce clk_has_parent()

This new function is similar to clk_set_parent(), except that it doesn't
actually change the parent. It merely checks that the given parent clock
can be a parent for the given clock.

A situation where this is useful is to check that a particular setup is
valid before switching to it. One specific use-case for this is atomic
modesetting in the DRM framework where setting a mode is divided into a
check phase where a given configuration is validated before applying
changes to the hardware.

Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
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