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@xxxxxxxxxxxxxx>
---
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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