On Fri, Oct 25, 2024 at 11:58:02AM +0200, Stefan Eichenberger wrote:
> From: Stefan Eichenberger <stefan.eichenberger@xxxxxxxxxxx>
>
> By default we expect all i2c nodes to be single-master, we do not have
> any module or carrier board that uses multi-master mode on any i2c
> controller. With this property set, we benefit from optimisations made
> exclusively for single-masters.
>
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@xxxxxxxxxxx>
> ---
> arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> index 5fa3959141911..95d5d2333ca1e 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> @@ -367,6 +367,7 @@ &i2c1 {
> pinctrl-1 = <&pinctrl_i2c1_gpio>;
> scl-gpios = <&gpio5 14 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> sda-gpios = <&gpio5 15 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> + single-master;
Hmm, I do not see this property is documented in i2c-imx bindings.
Shawn
> status = "okay";
>
> pca9450: pmic@25 {
> @@ -561,6 +562,7 @@ &i2c2 {
> pinctrl-1 = <&pinctrl_i2c2_gpio>;
> scl-gpios = <&gpio5 16 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> sda-gpios = <&gpio5 17 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> + single-master;
> status = "disabled";
> };
>
> @@ -574,6 +576,7 @@ &i2c3 {
> pinctrl-1 = <&pinctrl_i2c3_gpio>;
> scl-gpios = <&gpio5 18 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> sda-gpios = <&gpio5 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> + single-master;
> };
>
> /* Verdin I2C_1 */
> @@ -584,6 +587,7 @@ &i2c4 {
> pinctrl-1 = <&pinctrl_i2c4_gpio>;
> scl-gpios = <&gpio5 20 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> sda-gpios = <&gpio5 21 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> + single-master;
>
> gpio_expander_21: gpio-expander@21 {
> compatible = "nxp,pcal6416";
> --
> 2.43.0
>
