clk: Support CLK_IS_CRITICAL flag

Support CLK_IS_CRITICAL flag. Simply do not disable the clock even when
the enable count is zero.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 6a2d8ad178..ea3304bc7c 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -87,6 +87,9 @@ void clk_disable(struct clk *clk)
 	clk->enable_count--;
 
 	if (!clk->enable_count) {
+		if (clk->flags & CLK_IS_CRITICAL)
+			return;
+
 		if (clk->ops->disable)
 			clk->ops->disable(clk);