| Message ID | 20240617120818.81237-2-bastien.curutchet@bootlin.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v3,1/3] dt-bindings: i2c: gpio: Add 'settle-time-us' property | expand |
Hi, On Mon, Jun 17, 2024 at 02:08:16PM GMT, Bastien Curutchet wrote: > I2C MUXes described by the i2c-gpio-mux sometimes need a significant > amount of time to switch from a bus to another. When a new bus is > selected, the first I2C transfer can fail if it occurs too early. There > is no way to describe this transition delay that has to be waited before > starting the first I2C transfer. > > Add a 'settle-time-us' property that indicates the delay to be > respected before doing the first i2c transfer. > > Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com> Reviewed-by: Andi Shyti <andi.shyti@kernel.org> Andi
2024-06-17 at 14:08, Bastien Curutchet wrote: > I2C MUXes described by the i2c-gpio-mux sometimes need a significant > amount of time to switch from a bus to another. When a new bus is > selected, the first I2C transfer can fail if it occurs too early. There > is no way to describe this transition delay that has to be waited before > starting the first I2C transfer. > > Add a 'settle-time-us' property that indicates the delay to be > respected before doing the first i2c transfer. > > Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com> Acked-by: Peter Rosin <peda@axentia.se> Cheers, Peter
$subject should be "mux-gpio" instead of just "gpio". It could be mixed up with the i2c-gpio controller driver otherwise.
diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.yaml index f34cc7ad5a00..4a93d1f78f93 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.yaml +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.yaml @@ -57,6 +57,9 @@ properties: last value used. $ref: /schemas/types.yaml#/definitions/uint32 + settle-time-us: + description: Delay to wait before doing any transfer when a new bus gets selected. + allOf: - $ref: i2c-mux.yaml
I2C MUXes described by the i2c-gpio-mux sometimes need a significant amount of time to switch from a bus to another. When a new bus is selected, the first I2C transfer can fail if it occurs too early. There is no way to describe this transition delay that has to be waited before starting the first I2C transfer. Add a 'settle-time-us' property that indicates the delay to be respected before doing the first i2c transfer. Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com> --- Documentation/devicetree/bindings/i2c/i2c-mux-gpio.yaml | 3 +++ 1 file changed, 3 insertions(+)