linux-kernel - Re: [PATCH v2 1/4] arm64: dts: ti: k3-am62x: Enable AUDIO

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Message-ID: <20230807174306.yktrky7f6w3gqph7@sensually>
Date:   Mon, 7 Aug 2023 12:43:06 -0500
From:   Nishanth Menon <nm@...com>
To:     Francesco Dolcini <francesco@...cini.it>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jai Luthra <j-luthra@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: Re: [PATCH v2 1/4] arm64: dts: ti: k3-am62x: Enable AUDIO_REFCLKx

On 10:51-20230806, Francesco Dolcini wrote:
> From: Jai Luthra <j-luthra@...com>
> 
> On AM62-based SoCs the AUDIO_REFCLKx clocks can be used as an input to
> external peripherals when configured through CTRL_MMR, so add the
> clock nodes.
> 
> Signed-off-by: Jai Luthra <j-luthra@...com>
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> ---
> v2:
>  - s/clock/clock-controller/ on audio refclk nodes name.
> ---
>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi  | 18 ++++++++++++++++++
>  arch/arm64/boot/dts/ti/k3-am62a-main.dtsi | 18 ++++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> index ef90b2bc81eb..5f19ef46d44c 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> @@ -60,6 +60,24 @@ epwm_tbclk: clock-controller@...0 {
>  			reg = <0x4130 0x4>;
>  			#clock-cells = <1>;
>  		};
> +
> +		audio_refclk0: clock-controller@...0 {
> +			compatible = "ti,am62-audio-refclk";
> +			reg = <0x82e0 0x4>;
> +			clocks = <&k3_clks 157 0>;
> +			assigned-clocks = <&k3_clks 157 0>;
> +			assigned-clock-parents = <&k3_clks 157 8>;
> +			#clock-cells = <0>;
> +		};
> +
> +		audio_refclk1: clock-controller@...4 {
> +			compatible = "ti,am62-audio-refclk";
> +			reg = <0x82e4 0x4>;
> +			clocks = <&k3_clks 157 10>;
> +			assigned-clocks = <&k3_clks 157 10>;
> +			assigned-clock-parents = <&k3_clks 157 18>;
> +			#clock-cells = <0>;
> +		};
>  	};
>  
>  	dmss: bus@...00000 {
> diff --git a/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi
> index 3198af08fb9f..75ea7202e071 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi
> @@ -60,6 +60,24 @@ epwm_tbclk: clock-controller@...0 {
>  			reg = <0x4130 0x4>;
>  			#clock-cells = <1>;
>  		};
> +
> +		audio_refclk0: clock-controller@...0 {
> +			compatible = "ti,am62-audio-refclk";
> +			reg = <0x82e0 0x4>;
> +			clocks = <&k3_clks 157 0>;
> +			assigned-clocks = <&k3_clks 157 0>;
> +			assigned-clock-parents = <&k3_clks 157 8>;
> +			#clock-cells = <0>;
> +		};
> +
> +		audio_refclk1: clock-controller@...4 {
> +			compatible = "ti,am62-audio-refclk";
> +			reg = <0x82e4 0x4>;
> +			clocks = <&k3_clks 157 10>;
> +			assigned-clocks = <&k3_clks 157 10>;
> +			assigned-clock-parents = <&k3_clks 157 18>;
> +			#clock-cells = <0>;
> +		};
>  	};
>  
>  	dmss: bus@...00000 {
> -- 
> 2.25.1
> 


Jeez what a bit of a mess here - looks like I will have to punt this
series.

a) main_conf in arch/arm64/boot/dts/ti/k3-am62-main.dtsi is still
  syscon, simple-mfd -> I had thought we have converted these already, but
  apparently not.
b) we then have the yaml itself. Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
   it picks up clock-controller as ti,am654-ehrpwm-tbclk.yaml
   but the actual binding is Documentation/devicetree/bindings/clock/ti,am62-audio-refclk.yaml
   which is not enforced.

Jai: please sort this out before I can look at any of these audio
enablement patches involving refclk.


ALSO: please DONOT ignore dtbs_check warnings folks. it does show some
real issues in either bindings or dts.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D