[PATCH v3 1/7] clk: introduce clk_div_mask() helper

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

The patch introduces a helper that gives a divider mask based on register field
width.

The sequential patches will replace custom div_mask() macro in the
corresponding clock provider modules.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/clk-provider.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 5591ea7..20b0b67 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -353,6 +353,11 @@ struct clk_divider {
 	spinlock_t	*lock;
 };
 
+static inline unsigned long clk_div_mask(u8 width)
+{
+	return (1 << width) - 1;
+}
+
 #define CLK_DIVIDER_ONE_BASED		BIT(0)
 #define CLK_DIVIDER_POWER_OF_TWO	BIT(1)
 #define CLK_DIVIDER_ALLOW_ZERO		BIT(2)
-- 
2.1.4