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clk: divider: add CLK_DIVIDER_READ_ONLY flag 

From: Heiko Stuebner <heiko@sntech.de>

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@sntech.de>
[changed flag bit to BIT(5) as suggested by Tomasz Figa]
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Acked-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Max Schwarz <max.schwarz@online.de>
Tested-by: Max Schwarz <max.schwarz@online.de>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
hifive-unleashed-5.1
Heiko Stuebner 2014-05-23 18:32:15 +05:30 committed by Mike Turquette
parent 1923ca92a6
commit 79c6ab5095
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/clk/clk-divider.c
View File

@ -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;
init.ops = &clk_divider_ops;
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);

4
include/linux/clk-provider.h
View File

@ -320,6 +320,8 @@ 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;
@ -336,8 +338,10 @@ 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(5)
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,