linux-kernel - Re: [PATCH V4 2/5] arm64: dts: imx8mn: Enable Asynchronous Sample Rate Converter

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Date:   Wed, 18 Nov 2020 17:13:54 -0600
From:   Adam Ford <aford173@...il.com>
To:     arm-soc <linux-arm-kernel@...ts.infradead.org>
Cc:     Adam Ford-BE <aford@...conembedded.com>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...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>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 2/5] arm64: dts: imx8mn: Enable Asynchronous Sample
 Rate Converter

On Sat, Nov 7, 2020 at 5:58 AM Adam Ford <aford173@...il.com> 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 node for the spba-bus with the easrc node inside.
>
> Signed-off-by: Adam Ford <aford173@...il.com>

Shawn,

I split the dt-binding into a separate patch since I was struggling
with checking the yaml syntax.  Rob helped me find the proper branch
to use. I hope it goes through this time.

Do you have any comments on the rest of the series? I would like to
fix them if you have any concerns so I can resend if/when the
dt-binding is accepted.

thanks,

adam

> ---
> V4:  No change
> V3:  Change spba-bus@...00000 to spba: bus@...00000
> V2:  Make the DT node more in-line with the dt binding and remove
>      vendor customizations that are not applicable.
>  arch/arm64/boot/dts/freescale/imx8mn.dtsi | 28 +++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> index a06d2a6268e6..61560c083300 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> @@ -253,6 +253,34 @@ aips1: bus@...00000 {
>                         #size-cells = <1>;
>                         ranges;
>
> +                       spba: bus@...00000 {
> +                               compatible = "fsl,spba-bus", "simple-bus";
> +                               #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";
> +                                       firmware-name = "imx/easrc/easrc-imx8mn.bin";
> +                                       fsl,asrc-rate  = <8000>;
> +                                       fsl,asrc-format = <2>;
> +                                       status = "disabled";
> +                               };
> +                       };
> +
>                         gpio1: gpio@...00000 {
>                                 compatible = "fsl,imx8mn-gpio", "fsl,imx35-gpio";
>                                 reg = <0x30200000 0x10000>;
> --
> 2.25.1
>