[alsa-devel] [PATCH 2/3] ASoC: dt-bindings: fsl_easrc: Add document for EASRC

[Fabio Estevam]

On Wed, Feb 12, 2020 at 1:35 AM Shengjiu Wang <shengjiu.wang at nxp.com> wrote:
>
> EASRC (Enhanced Asynchronous Sample Rate Converter) is a new
> IP module found on i.MX815.

i.MX815 in an internal terminology. Please avoid it on the commit log.

>
> Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
> ---
>  .../devicetree/bindings/sound/fsl,easrc.txt   | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/fsl,easrc.txt
>
> diff --git a/Documentation/devicetree/bindings/sound/fsl,easrc.txt b/Documentation/devicetree/bindings/sound/fsl,easrc.txt
> new file mode 100644
> index 000000000000..0e8153165e3b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/fsl,easrc.txt
> @@ -0,0 +1,57 @@
> +NXP Asynchronous Sample Rate Converter (ASRC) Controller
> +
> +The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a
> +signal associated with an input clock into a signal associated with a different
> +output clock. The driver currently works as a Front End of DPCM with other Back
> +Ends Audio controller such as ESAI, SSI and SAI. It has four context to support
> +four substreams within totally 32 channels.
> +
> +Required properties:
> +- compatible:                Contains "fsl,imx8mn-easrc".
> +
> +- reg:                       Offset and length of the register set for the
> +                            device.
> +
> +- interrupts:                Contains the asrc interrupt.
> +
> +- dmas:                      Generic dma devicetree binding as described in
> +                            Documentation/devicetree/bindings/dma/dma.txt.
> +
> +- dma-names:                 Contains "ctx0_rx", "ctx0_tx",
> +                                     "ctx1_rx", "ctx1_tx",
> +                                     "ctx2_rx", "ctx2_tx",
> +                                     "ctx3_rx", "ctx3_tx".
> +
> +- clocks:                    Contains an entry for each entry in clock-names.
> +
> +- clock-names:               "mem" - Peripheral clock to driver module.
> +
> +- fsl,easrc-ram-script-name: The coefficient table for the filters
> +
> +- fsl,asrc-rate:             Defines a mutual sample rate used by DPCM Back
> +                            Ends.
> +
> +- fsl,asrc-width:            Defines a mutual sample width used by DPCM Back
> +                            Ends.
> +
> +Example:
> +
> +easrc: easrc at 300C0000 {
> +       compatible = "fsl,imx8mn-easrc";
> +       reg = <0x0 0x300C0000 0x0 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";
> +       fsl,asrc-rate  = <8000>;
> +       fsl,asrc-width = <16>;
> +       status = "disabled";
> +};
> --
> 2.21.0
>