clk: add always enabled clocks

Current barebox clk framework allow disable any clock
and there is no means to prevent that.

But there are the clocks that can't be disabled
by software at all.

This patch allow registration of a clock immune to clk_disable().

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/clk.h b/include/linux/clk.h
index 00588bff05..1030b50c63 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -179,8 +179,11 @@ struct clk {
 	int num_parents;
 
 	struct clk **parents;
+	unsigned long flags;
 };
 
+#define CLK_ALWAYS_ENABLED	(1 << 0)
+
 struct clk *clk_fixed(const char *name, int rate);
 struct clk *clk_divider(const char *name, const char *parent,
 		void __iomem *reg, u8 shift, u8 width);