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i2c: mux: gpio: Add support for the 'settle-time-us' property

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Some hardware need some time to switch from a bus to another. This can
cause the first transfers following the selection of a bus to fail.
There is no way to configure this kind of waiting time in the driver.

Add support for the 'settle-time-us' device-tree property. When set,
the i2c_mux_gpio_select() applies a delay before returning, leaving
enough time to the hardware to switch to the new bus.

Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Bastien Curutchet
2024-06-17 14:08:18 +02:00
committed by Andi Shyti
parent a618d86d5a
commit 45b8ee7182
2 changed files with 8 additions and 0 deletions
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include/linux/platform_data/i2c-mux-gpio.h
+2
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@@ -19,6 +19,7 @@
* position
* @n_values: Number of multiplexer positions (busses to instantiate)
* @idle: Bitmask to write to MUX when idle or GPIO_I2CMUX_NO_IDLE if not used
* @settle_time: Delay to wait when a new bus is selected
*/
struct i2c_mux_gpio_platform_data {
int parent;
@@ -26,6 +27,7 @@ struct i2c_mux_gpio_platform_data {
const unsigned *values;
int n_values;
unsigned idle;
u32 settle_time;
};
#endif /* _LINUX_I2C_MUX_GPIO_H */