[PATCH v2 07/18] CLK: clk-divider: Respect CLK_DIVIDER_POWER_OF_TWO flag

[Andrey Panov <rockford@yandex.ru>]

Signed-off-by: Andrey Panov <rockford@yandex.ru>
---
 drivers/clk/clk-divider.c | 9 +++++++++
 include/linux/clk.h       | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index cedcdda..646e5b0 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -19,6 +19,7 @@
 #include <malloc.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/log2.h>
 
 #define div_mask(d)	((1 << ((d)->width)) - 1)
 
@@ -26,6 +27,8 @@ static unsigned int _get_maxdiv(struct clk_divider *divider)
 {
 	if (divider->flags & CLK_DIVIDER_ONE_BASED)
 		return div_mask(divider);
+	if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+		return 1 << div_mask(divider);
 	return div_mask(divider) + 1;
 }
 
@@ -44,6 +47,8 @@ static unsigned int _get_div(struct clk_divider *divider, unsigned int val)
 {
 	if (divider->flags & CLK_DIVIDER_ONE_BASED)
 		return val;
+	if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+		return 1 << val;
 	if (divider->table)
 		return _get_table_div(divider->table, val);
 	return val + 1;
@@ -64,6 +69,8 @@ static unsigned int _get_val(struct clk_divider *divider, unsigned int div)
 {
 	if (divider->flags & CLK_DIVIDER_ONE_BASED)
 		return div;
+	if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+		return __ffs(div);
 	if (divider->table)
 		return  _get_table_val(divider->table, div);
 	return div - 1;
@@ -102,6 +109,8 @@ static bool _is_valid_table_div(const struct clk_div_table *table,
 
 static bool _is_valid_div(struct clk_divider *divider, unsigned int div)
 {
+	if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+		return is_power_of_2(div);
 	if (divider->table)
 		return _is_valid_table_div(divider->table, div);
 	return true;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 65d3e99..56890a0 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -248,6 +248,7 @@ struct clk_divider {
 	int table_size;
 };
 
+#define CLK_DIVIDER_POWER_OF_TWO	(1 << 1)
 #define CLK_DIVIDER_HIWORD_MASK		(1 << 3)
 
 #define CLK_MUX_HIWORD_MASK		(1 << 2)
-- 
2.1.4


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