On Mon, Mar 09, 2020 at 11:58:33AM +0800, Shengjiu Wang wrote: > EASRC (Enhanced Asynchronous Sample Rate Converter) is a new > IP module found on i.MX8MN. > > Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx> > --- > .../devicetree/bindings/sound/fsl,easrc.yaml | 101 ++++++++++++++++++ > 1 file changed, 101 insertions(+) > create mode 100644 Documentation/devicetree/bindings/sound/fsl,easrc.yaml > > diff --git a/Documentation/devicetree/bindings/sound/fsl,easrc.yaml b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml > new file mode 100644 > index 000000000000..ff22f8056a63 > --- /dev/null > +++ b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml > @@ -0,0 +1,101 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/sound/fsl,easrc.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: NXP Asynchronous Sample Rate Converter (ASRC) Controller > + > +maintainers: > + - Shengjiu Wang <shengjiu.wang@xxxxxxx> > + > +properties: > + $nodename: > + pattern: "^easrc@.*" > + > + compatible: > + const: fsl,imx8mn-easrc > + > + reg: > + maxItems: 1 > + > + interrupts: > + maxItems: 1 > + > + clocks: > + items: > + - description: Peripheral clock > + > + clock-names: > + items: > + - const: mem > + > + dmas: > + maxItems: 8 > + > + dma-names: > + items: > + - const: ctx0_rx > + - const: ctx0_tx > + - const: ctx1_rx > + - const: ctx1_tx > + - const: ctx2_rx > + - const: ctx2_tx > + - const: ctx3_rx > + - const: ctx3_tx > + > + fsl,easrc-ram-script-name: 'firmware-name' is the established property name for this. > + allOf: > + - $ref: /schemas/types.yaml#/definitions/string > + - const: imx/easrc/easrc-imx8mn.bin Though if there's only 1 possible value, why does this need to be in DT? > + description: The coefficient table for the filters If the firmware is only 1 thing, then perhaps this should just be a DT property rather than a separate file. It depends on who owns/creates this file. If fixed for the platform, then DT is a good fit. If updated separately from DT and boot firmware, then keeping it separate makes sense. > + > + fsl,asrc-rate: > + allOf: > + - $ref: /schemas/types.yaml#/definitions/uint32 > + - minimum: 8000 > + - maximum: 192000 > + description: Defines a mutual sample rate used by DPCM Back Ends > + > + fsl,asrc-format: > + allOf: > + - $ref: /schemas/types.yaml#/definitions/uint32 > + - enum: [2, 6, 10, 32, 36] > + default: 2 > + description: > + Defines a mutual sample format used by DPCM Back Ends > + > +required: > + - compatible > + - reg > + - interrupts > + - clocks > + - clock-names > + - dmas > + - dma-names > + - fsl,easrc-ram-script-name > + - fsl,asrc-rate > + - fsl,asrc-format > + > +examples: > + - | > + #include <dt-bindings/clock/imx8mn-clock.h> > + > + easrc: easrc@300C0000 { > + compatible = "fsl,imx8mn-easrc"; > + reg = <0x0 0x300C0000 0x0 0x10000>; > + interrupts = <0x0 122 0x4>; > + 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-format = <2>; > + }; > -- > 2.21.0 >
