A common operation for a clock signal generator is to shift the phase of that signal. This patch introduces a new function to the clk.h API to dynamically adjust the phase of a clock signal. Additionally this patch introduces support for the new function in the clock framework via the .set_phase & .get_phase callback in struct clk_ops.
Signed-off-by: Ziyuan Xu xzy.xu@rock-chips.com ---
drivers/clk/clk-uclass.c | 20 ++++++++++++++++++++ include/clk-uclass.h | 17 +++++++++++++++++ include/clk.h | 20 ++++++++++++++++++++ 3 files changed, 57 insertions(+)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 6fcfd69..47628b1 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -165,6 +165,26 @@ ulong clk_set_rate(struct clk *clk, ulong rate) return ops->set_rate(clk, rate); }
+int clk_get_phase(struct clk *clk) +{ + struct clk_ops *ops = clk_dev_ops(clk->dev); + + if (!ops->get_phase) + return -ENOSYS; + + return ops->get_phase(clk); +} + +int clk_set_phase(struct clk *clk, int degrees) +{ + struct clk_ops *ops = clk_dev_ops(clk->dev); + + if (!ops->set_phase) + return -ENOSYS; + + return ops->set_phase(clk, degrees); +} + int clk_enable(struct clk *clk) { struct clk_ops *ops = clk_dev_ops(clk->dev); diff --git a/include/clk-uclass.h b/include/clk-uclass.h index 07c1065..0e56daa 100644 --- a/include/clk-uclass.h +++ b/include/clk-uclass.h @@ -77,6 +77,23 @@ struct clk_ops { */ ulong (*set_rate)(struct clk *clk, ulong rate); /** + * clk_get_phase() - Get the phase shift of a clock signal. + * + * @clk: The clock to manipulate. + * @return the phase shift of a clock node in degrees, + * otherwise returns -ve error code. + */ + int (*get_phase)(struct clk *clk); + + /** + * clk_set_rate() - Adjust the phase shift of a clock signal. + * + * @clk: The clock to manipulate. + * @degrees: Numberof degrees the signal is shifted. + * @return 0 on success, or -ve error code. + */ + int (*set_phase)(struct clk *clk, int degrees); + /** * enable() - Enable a clock. * * @clk: The clock to manipulate. diff --git a/include/clk.h b/include/clk.h index 5a5c2ff..1858fef 100644 --- a/include/clk.h +++ b/include/clk.h @@ -157,6 +157,26 @@ ulong clk_get_rate(struct clk *clk); ulong clk_set_rate(struct clk *clk, ulong rate);
/** + * clk_get_phase() - Get the phase shift of a clock signal. + * + * @clk: A clock struct that was previously successfully requested by + * clk_request/get_by_*(). + * @return the phase shift of a clock node in degrees, otherwise returns + * -ve error code. + */ +int clk_get_phase(struct clk *clk); + +/** + * clk_set_rate() - Adjust the phase shift of a clock signal. + * + * @clk: A clock struct that was previously successfully requested by + * clk_request/get_by_*(). + * @degrees: Numberof degrees the signal is shifted. + * @return 0 on success, or -ve error code. + */ +int clk_set_phase(struct clk *clk, int degrees); + +/** * clk_enable() - Enable (turn on) a clock. * * @clk: A clock struct that was previously successfully requested by