Re: [PATCH 1/1] arm64: dts: imx8qxp-mek: add cm40_i2c, wm8960/wm8962 and sai[0,1,4,5]

[Francesco Dolcini]

Hello Frank,

On Thu, Apr 04, 2024 at 12:19:13PM -0400, Frank Li wrote:
> imx8qxp-mek use two kind audio codec, wm8960 and wm8962. Using dummy gpio
> i2c bus mux to connect both i2c devices. One will probe failure and other
> will probe success when devices driver check whoami. So one dtb can cover
> both board configuration.
> 
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
>  arch/arm64/boot/dts/freescale/imx8qxp-mek.dts | 210 ++++++++++++++++++
>  1 file changed, 210 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
> index 8360bb851ac03..adff87c7cf305 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
> @@ -44,6 +51,105 @@ usb3_data_ss: endpoint {

[...]

> +	/*
> +	 * This dummy i2c mux. GPIO actually will not impact selection. At actual boards, only 1
> +	 * device connectted. I2C client driver will check ID when probe. Only matched ID's driver
> +	 * probe successfully.
> +	 */
> +	i2cvmux: i2cmux {
> +		compatible = "i2c-mux-gpio";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		mux-gpios = <&lsio_gpio5 0 GPIO_ACTIVE_HIGH>; /* use an unused gpio */

There is for sure people that have more experience and competency that
me and it would be interesting to hear their feedback, but this
looks like a bad hack, and you are just playing with the driver
behavior to ensure that you get what you need.

Francesco