[PATCH 3/4] clk: Add fixed-rate clock
From: Francesco VIRLINZI <hidden>
Date: 2011-05-24 07:01:27
Hi Jeremy Is this patch really required? If I have just a static clk with only a name and a rate; I can obtain the rate with the clk_get_rate(..) and I don't need extra code/data to manage the fixed_clk (in my view it's already fixed due to a null struct clk_hw_ops). Could you clarify what the would address? Thanks Regards Francesco On 5/20/2011 9:27 AM, Jeremy Kerr wrote:
quoted hunk ↗ jump to hunk
Signed-off-by: Jeremy Kerr<redacted> --- drivers/clk/Kconfig | 4 ++++ drivers/clk/Makefile | 1 + drivers/clk/clk-fixed.c | 17 +++++++++++++++++ include/linux/clk.h | 14 ++++++++++++++ 4 files changed, 36 insertions(+)diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index e611e34..0a27963 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig@@ -5,3 +5,7 @@ config CLKDEV_LOOKUP config GENERIC_CLK bool + +config GENERIC_CLK_FIXED + bool + depends on GENERIC_CLKdiff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 570d5b9..9a3325a 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile@@ -1,3 +1,4 @@ obj-$(CONFIG_CLKDEV_LOOKUP) += clkdev.o obj-$(CONFIG_GENERIC_CLK) += clk.o +obj-$(CONFIG_GENERIC_CLK_FIXED) += clk-fixed.odiff --git a/drivers/clk/clk-fixed.c b/drivers/clk/clk-fixed.c new file mode 100644 index 0000000..47a27f9 --- /dev/null +++ b/drivers/clk/clk-fixed.c@@ -0,0 +1,17 @@ + +#include<linux/clk.h> +#include<linux/module.h> + +#define to_clk_fixed(c) container_of(c, struct clk_hw_fixed, hw) + +static unsigned long clk_fixed_recalc_rate(struct clk_hw *hw) +{ + return to_clk_fixed(hw)->rate; +} + +struct clk_hw_ops clk_fixed_ops = { + .recalc_rate = clk_fixed_recalc_rate, +}; +EXPORT_SYMBOL_GPL(clk_fixed_ops); + +diff --git a/include/linux/clk.h b/include/linux/clk.h index e0969d2..fd62e86 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h@@ -110,6 +110,20 @@ int clk_prepare(struct clk *clk); */ void clk_unprepare(struct clk *clk); +/* Base clock implementations. Platform clock implementations can use these + * directly, or 'subclass' as approprate */ + +#ifdef CONFIG_GENERIC_CLK_FIXED + +struct clk_hw_fixed { + struct clk_hw hw; + unsigned long rate; +}; + +extern struct clk_hw_ops clk_fixed_ops; + +#endif /* CONFIG_GENERIC_CLK_FIXED */ + #else /* !CONFIG_GENERIC_CLK */ /*_______________________________________________ linux-arm-kernel mailing list linux-arm-kernel at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel