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mux: add support for delay after muxing

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Hardware may require some time for the muxed analog signals to settle
after the muxing is changed.  Allow users of the mux subsystem to
specify this delay with the new mux_control_select_delay() function (and
the _try equivalent).

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Peter Rosin <peda@axentia.se>
Link: https://lore.kernel.org/r/20211007134641.13417-2-vincent.whitchurch@axis.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Vincent Whitchurch
2021-10-07 15:46:39 +02:00
committed by Jonathan Cameron
parent 796e5d0b1e
commit 17b5b576ff
3 changed files with 55 additions and 10 deletions
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23
include/linux/mux/consumer.h
View File

@@ -16,10 +16,25 @@ struct device;
struct mux_control;
unsigned int mux_control_states(struct mux_control *mux);
int __must_check mux_control_select(struct mux_control *mux,
unsigned int state);
int __must_check mux_control_try_select(struct mux_control *mux,
unsigned int state);
int __must_check mux_control_select_delay(struct mux_control *mux,
unsigned int state,
unsigned int delay_us);
int __must_check mux_control_try_select_delay(struct mux_control *mux,
unsigned int state,
unsigned int delay_us);
static inline int __must_check mux_control_select(struct mux_control *mux,
unsigned int state)
{
return mux_control_select_delay(mux, state, 0);
}
static inline int __must_check mux_control_try_select(struct mux_control *mux,
unsigned int state)
{
return mux_control_try_select_delay(mux, state, 0);
}
int mux_control_deselect(struct mux_control *mux);
struct mux_control *mux_control_get(struct device *dev, const char *mux_name);

4
include/linux/mux/driver.h
View File

@@ -12,6 +12,7 @@
#include <dt-bindings/mux/mux.h>
#include <linux/device.h>
#include <linux/ktime.h>
#include <linux/semaphore.h>
struct mux_chip;
@@ -33,6 +34,7 @@ struct mux_control_ops {
* @states: The number of mux controller states.
* @idle_state: The mux controller state to use when inactive, or one
* of MUX_IDLE_AS_IS and MUX_IDLE_DISCONNECT.
* @last_change: Timestamp of last change
*
* Mux drivers may only change @states and @idle_state, and may only do so
* between allocation and registration of the mux controller. Specifically,
@@ -47,6 +49,8 @@ struct mux_control {
unsigned int states;
int idle_state;
ktime_t last_change;
};
/**