@@ -6,6 +6,7 @@
*/
#include <linux/bits.h>
+#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
@@ -37,6 +38,9 @@ static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
i2c_mux_gpio_set(mux, chan);
+ if (mux->data.transition_delay)
+ udelay(mux->data.transition_delay);
+
return 0;
}
@@ -116,6 +120,8 @@ static int i2c_mux_gpio_probe_fw(struct gpiomux *mux,
if (device_property_read_u32(dev, "idle-state", &mux->data.idle))
mux->data.idle = I2C_MUX_GPIO_NO_IDLE;
+ device_property_read_u32(dev, "transition-delay-us", &mux->data.transition_delay);
+
return 0;
}
@@ -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
+ * @transition_delay: 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;
+ int transition_delay;
};
#endif /* _LINUX_I2C_MUX_GPIO_H */
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 'transition-delay-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> --- drivers/i2c/muxes/i2c-mux-gpio.c | 6 ++++++ include/linux/platform_data/i2c-mux-gpio.h | 2 ++ 2 files changed, 8 insertions(+)