clk: divider: add CLK_DIVIDER_READ_ONLY flag
From: Heiko Stuebner <heiko@...> Date: Thu, 10 Apr 2014 13:39:42 +0200
Commit-Message
Similar to muxes which already have a read-only flag there sometimes exist dividers which should not be changed by the clock framework but whose value still should be readable. Therefore add a READ_ONLY flag similar to the mux-one to clk-divider Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
drivers/clk/clk-divider.c | 10 +++++++++- include/linux/clk-provider.h | 4 ++++ 2 files changed, 13 insertions(+), 1 deletion(-)
Statistics
- 13 lines added
- 1 lines removed
Changes
-------------------------- drivers/clk/clk-divider.c ---------------------------
index b3c8396..c9343f5 100644
@@ -361,6 +361,11 @@ const struct clk_ops clk_divider_ops = {
};
EXPORT_SYMBOL_GPL(clk_divider_ops);
+const struct clk_ops clk_divider_ro_ops = {
+ .recalc_rate = clk_divider_recalc_rate,
+};
+EXPORT_SYMBOL_GPL(clk_divider_ro_ops);
+
static struct clk *_register_divider(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
void __iomem *reg, u8 shift, u8 width,
@@ -386,7 +391,10 @@ static struct clk *_register_divider(struct device *dev, const char *name,
}
init.name = name;
+ if (clk_divider_flags & CLK_DIVIDER_READ_ONLY)
+ init.ops = &clk_divider_ro_ops;
+ else
+ init.ops = &clk_divider_ops;
init.flags = flags | CLK_IS_BASIC;
init.parent_names = (parent_name ? &parent_name: NULL);
init.num_parents = (parent_name ? 1 : 0);
------------------------- include/linux/clk-provider.h -------------------------
index 59e2eb5..9c2cf89 100644
@@ -314,6 +314,8 @@ struct clk_div_table {
* updated to indicate changing divider bits.
* CLK_DIVIDER_ROUND_CLOSEST - Makes the best calculated divider to be rounded
* to the closest integer instead of the up one.
+ * CLK_DIVIDER_READ_ONLY - The divider settings are preconfigured and should
+ * not be changed by the clock framework.
*/
struct clk_divider {
struct clk_hw hw;
@@ -330,8 +332,10 @@ struct clk_divider {
#define CLK_DIVIDER_ALLOW_ZERO BIT(2)
#define CLK_DIVIDER_HIWORD_MASK BIT(3)
#define CLK_DIVIDER_ROUND_CLOSEST BIT(4)
+#define CLK_DIVIDER_READ_ONLY BIT(4)
extern const struct clk_ops clk_divider_ops;
+extern const struct clk_ops clk_divider_ro_ops;
struct clk *clk_register_divider(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
void __iomem *reg, u8 shift, u8 width,