[PATCH 05/14] clk: Support CLK_IS_CRITICAL flag

[Sascha Hauer <s.hauer@pengutronix.de>]

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>
---
 drivers/clk/clk.c   | 3 +++
 include/linux/clk.h | 1 +
 2 files changed, 4 insertions(+)

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);
 
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 5b0a93095d..5ad12c571c 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -286,6 +286,7 @@ static inline void clk_put(struct clk *clk)
 
 #define CLK_SET_RATE_PARENT     (1 << 0) /* propagate rate change up one level */
 #define CLK_IGNORE_UNUSED       (1 << 3) /* do not gate even if unused */
+#define CLK_IS_CRITICAL         (1 << 11) /* do not gate, ever */
 /* parents need enable during gate/ungate, set rate and re-parent */
 #define CLK_OPS_PARENT_ENABLE   (1 << 12)
 
-- 
2.20.1


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