linux-kernel - Re: [PATCH 1/5] arm64: dts: imx8mn: Enable Asynchronous Sample Rate Converter

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Date:   Sun, 1 Nov 2020 10:03:09 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, aford@...conembedded.com,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] arm64: dts: imx8mn: Enable Asynchronous Sample Rate
 Converter

On Mon, Oct 19, 2020 at 12:45:24PM -0500, Adam Ford wrote:
> The driver exists for the Enhanced Asynchronous Sample Rate Converter
> (EASRC) Controller, but there isn't a device tree entry for it.
> 
> On the vendor kernel, they put this on a spba-bus for SDMA support.
> 
> Add the the node for the spba-bus with the easrc node inside.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> index 746faf1cf2fb..7d34281332e1 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> @@ -246,6 +246,34 @@ aips1: bus@...00000 {
>  			#size-cells = <1>;
>  			ranges;
>  
> +			spba-bus@...00000 {

spba: bus@...00000

> +				compatible = "fsl,spba-bus", "simple-bus";

"fsl,spba-bus" is undocumented.  Document it or drop it.

> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +				reg = <0x30000000 0x100000>;
> +				ranges;
> +
> +				easrc: easrc@...C0000 {
> +					compatible = "fsl,imx8mn-easrc";
> +					reg = <0x300C0000 0x10000>;
> +					interrupts = <GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>;
> +					clocks = <&clk IMX8MN_CLK_ASRC_ROOT>;
> +					clock-names = "mem";
> +					dmas = <&sdma2 16 23 0> , <&sdma2 17 23 0>,
> +					       <&sdma2 18 23 0> , <&sdma2 19 23 0>,
> +					       <&sdma2 20 23 0> , <&sdma2 21 23 0>,
> +					       <&sdma2 22 23 0> , <&sdma2 23 23 0>;
> +					dma-names = "ctx0_rx", "ctx0_tx",
> +						    "ctx1_rx", "ctx1_tx",
> +						    "ctx2_rx", "ctx2_tx",
> +						    "ctx3_rx", "ctx3_tx";
> +					fsl,easrc-ram-script-name = "imx/easrc/easrc-imx8mn.bin";

Undocumented property?

Shawn

> +					fsl,asrc-rate  = <8000>;
> +					fsl,asrc-width = <16>;
> +					status = "disabled";
> +				};
> +			};
> +
>  			gpio1: gpio@...00000 {
>  				compatible = "fsl,imx8mn-gpio", "fsl,imx35-gpio";
>  				reg = <0x30200000 0x10000>;
> -- 
> 2.25.1
>