Thierry Reding 4e88f3de89
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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4e88f3de89