From: Benjamin Tietz benjamin@micronet24.de
Currently, clocks can be enabled, only. To be feature-complete - and allow a bit of power-saving in applications - disabling a clock should be possible, too.
This extend the API of the DM clock driver to allow a clock to be disabled.
The corresponding operation is optional for not breaking existing drivers. --- drivers/clk/clk-uclass.c | 10 ++++++++++ include/clk.h | 18 ++++++++++++++++++ 2 files changed, 28 insertions(+)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index b483c1e..462f5f8 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -44,6 +44,16 @@ int clk_enable(struct udevice *dev, int periph) return ops->enable(dev, periph); }
+int clk_disable(struct udevice *dev, int periph) +{ + struct clk_ops *ops = clk_get_ops(dev); + + if (!ops->disable) + return -ENOSYS; + + return ops->disable(dev, periph); +} + ulong clk_get_periph_rate(struct udevice *dev, int periph) { struct clk_ops *ops = clk_get_ops(dev); diff --git a/include/clk.h b/include/clk.h index ca20c3d..395f813 100644 --- a/include/clk.h +++ b/include/clk.h @@ -43,6 +43,15 @@ struct clk_ops { int (*enable)(struct udevice *dev, int periph);
/** + * disable() - Disable the clock for a peripheral + * + * @dev: clock provider + * @periph: Peripheral ID to enable + * @return zero on success, or -ve error code + */ + int (*disable)(struct udevice *dev, int periph); + + /** * get_periph_rate() - Get clock rate for a peripheral * * @dev: Device to check (UCLASS_CLK) @@ -90,6 +99,15 @@ ulong clk_set_rate(struct udevice *dev, ulong rate); int clk_enable(struct udevice *dev, int periph);
/** + * clk_disable() - Disable the clock for a peripheral + * + * @dev: clock provider + * @periph: Peripheral ID to enable + * @return zero on success, or -ve error code + */ +int clk_disable(struct udevice *dev, int periph); + +/** * clk_get_periph_rate() - Get current clock rate for a peripheral * * @dev: Device to check (UCLASS_CLK)