clk: generalize devm_clk_get() a bit
[ Upstream commit abae8e57 ] Allow to add an exit hook to devm managed clocks. Also use clk_get_optional() in devm_clk_get_optional instead of open coding it. The generalisation will be used in the next commit to add some more devm_clk helpers. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Alexandru Ardelean <aardelean@deviqon.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20220520075737.758761-3-u.kleine-koenig@pengutronix.de Signed-off-by: Stephen Boyd <sboyd@kernel.org> Stable-dep-of: c61bfb1c ("mmc: mtk-sd: Fix missing clk_disable_unprepare in msdc_of_clock_parse()") Signed-off-by: Sasha Levin <sashal@kernel.org>
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