media: s5p-mfc: Make additional clocks optional
[ Upstream commit e08efef8fe7db87206314c19b341612c719f891a ] Since the beginning the second clock ('special', 'sclk') was optional and it is not available on some variants of Exynos SoCs (i.e. Exynos5420 with v7 of MFC hardware). However commit 1bce6fb3 ("[media] s5p-mfc: Rework clock handling") made handling of all specified clocks mandatory. This patch restores original behavior of the driver and fixes its operation on Exynos5420 SoCs. Fixes: 1bce6fb3 ("[media] s5p-mfc: Rework clock handling") Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: NSasha Levin <sashal@kernel.org>
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