Re: [PATCH 1/3] arm64: dts: imx8mm-evk: support more sample rates for wm8524 card

[Frank Li <Frank.li@nxp.com>]

On Wed, Jul 16, 2025 at 02:11:12PM +0800, Shengjiu Wang wrote:
> The wm8524 codec is connected to the SAI interface. There are two audio
> plls on i.MX8MM, one pll can be the clock source of 44kHz series rates,
> another pll can be clock source of 48kHz series rates.
>
> Add mclk-fs property for the clock ratio, remove 'clocks' property for
> codec that doesn't need to handle clock enablement, add
> 'system-clock-direction-out' for clock is from cpu dai.

Can you provide the reason why need such change?

>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> index 622caaa78eaf..ff7ca2075230 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> @@ -147,6 +147,7 @@ sound-wm8524 {
>  		simple-audio-card,format = "i2s";
>  		simple-audio-card,frame-master = <&cpudai>;
>  		simple-audio-card,bitclock-master = <&cpudai>;
> +		simple-audio-card,mclk-fs = <256>;

what's measn 256? Do you need mention in commit message?

Frank
>  		simple-audio-card,widgets =
>  			"Line", "Left Line Out Jack",
>  			"Line", "Right Line Out Jack";
> @@ -158,11 +159,11 @@ cpudai: simple-audio-card,cpu {
>  			sound-dai = <&sai3>;
>  			dai-tdm-slot-num = <2>;
>  			dai-tdm-slot-width = <32>;
> +			system-clock-direction-out;
>  		};
>
>  		simple-audio-card,codec {
>  			sound-dai = <&wm8524>;
> -			clocks = <&clk IMX8MM_CLK_SAI3_ROOT>;
>  		};
>  	};
>
> @@ -570,9 +571,17 @@ &sai2 {
>  &sai3 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_sai3>;
> -	assigned-clocks = <&clk IMX8MM_CLK_SAI3>;
> -	assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
> -	assigned-clock-rates = <24576000>;
> +	assigned-clocks = <&clk IMX8MM_AUDIO_PLL1>,
> +			  <&clk IMX8MM_AUDIO_PLL2>,
> +			  <&clk IMX8MM_CLK_SAI3>;
> +	assigned-clock-parents = <0>, <0>, <&clk IMX8MM_AUDIO_PLL1_OUT>;
> +	assigned-clock-rates = <393216000>, <361267200>, <24576000>;
> +	fsl,sai-mclk-direction-output;
> +	clocks = <&clk IMX8MM_CLK_SAI3_IPG>, <&clk IMX8MM_CLK_DUMMY>,
> +		<&clk IMX8MM_CLK_SAI3_ROOT>, <&clk IMX8MM_CLK_DUMMY>,
> +		<&clk IMX8MM_CLK_DUMMY>, <&clk IMX8MM_AUDIO_PLL1_OUT>,
> +		<&clk IMX8MM_AUDIO_PLL2_OUT>;
> +	clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3", "pll8k", "pll11k";
>  	status = "okay";
>  };
>
> --
> 2.34.1
>