On 2023/12/21 21:53, Conor Dooley wrote:
Xingyu, Mark,
On Thu, Dec 21, 2023 at 11:32:22AM +0800, Xingyu Wu wrote:
Add bindings for the Multi-Channel I2S controller of Cadence on the StarFive JH8100 SoC.
Signed-off-by: Xingyu Wu xingyu.wu@starfivetech.com
.../bindings/sound/cdns,jh8100-i2s.yaml | 100 ++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/cdns,jh8100-i2s.yaml
diff --git a/Documentation/devicetree/bindings/sound/cdns,jh8100-i2s.yaml b/Documentation/devicetree/bindings/sound/cdns,jh8100-i2s.yaml new file mode 100644 index 000000000000..5d95d9ab3e45 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/cdns,jh8100-i2s.yaml @@ -0,0 +1,100 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/sound/cdns,jh8100-i2s.yaml#
Filename matching the compatible please.
Noted.
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+title: Cadence multi-channel I2S controller for StarFive JH8100 SoC
+description: |
You only need the | if there is formatting to preserve.
Will drop.
- The Cadence I2S Controller implements a function of the multi-channel
- (up to 8-channel) bus. It combines functions of a transmitter and a receiver.
- It is used in the StarFive JH8100 SoC.
+maintainers:
- Xingyu Wu xingyu.wu@starfivetech.com
- Walker Chen walker.chen@starfivetech.com
+properties:
- compatible:
- const: starfive,jh8100-i2s
- reg:
- maxItems: 1
- interrupts:
- description: |
The interrupt line number for the I2S controller. Add thisparameter if the I2S controller that you are using does notsupport DMA.You've got one i2s controller here, you should know if it supports DMA or not.
The I2S already supports interrupt handler, but if the SoC supports DMA controller to be use, it can optionally use DMA.
- maxItems: 1
- clocks:
- items:
- description: Bit clock- description: Main ICG clock- description: Inner master clock- clock-names:
- items:
- const: bclk- const: icg- const: mclk_inner- resets:
- maxItems: 1
- dmas:
- items:
- description: TX DMA Channel- description: RX DMA Channel- minItems: 1
- dma-names:
- items:
- const: tx- const: rx- minItems: 1
- cdns,i2s-max-channels:
- description: |
Number of I2S max stereo channels supported by the hardware.- $ref: /schemas/types.yaml#/definitions/uint32
- minimum: 1
- maximum: 8
Mark, is there no common property for this kind of thing? That said, there's one device here so the number is known at present. Another note, this property is not required, so it should have a default.
It's kinda hard to know with this binding - it is touted as being for a particular Cadence IP, and some aspects are pretty generic, but at the same time there's only one device here so it's hard to tell what is variable between implementations and what is not. Are there no other implementations of this controller? Unless it is brand new, I find that hard to believe.
Cheers, Conor.
Sorry, It does not seem to be common property. The Cadence I2S supports 8 channels. There are four I2S controllers on the JH8100 SoC, and two of them just provide 4 channels to use, one of them just provide 2 channels. It seems to depend on the SoC.
Thanks, Xingyu Wu
- "#sound-dai-cells":
- const: 0
+required:
- compatible
- reg
- clocks
- clock-names
- resets
+oneOf:
- required:
- dmas- dma-names
- required:
- interrupts+unevaluatedProperties: false
+examples:
- |
- i2s@122b0000 {
compatible = "starfive,jh8100-i2s";reg = <0x122b0000 0x1000>;clocks = <&syscrg_ne 133>,<&syscrg_ne 170>,<&syscrg 50>;clock-names = "bclk", "icg","mclk_inner";resets = <&syscrg_ne 43>;dmas = <&dma 7>, <&dma 6>;dma-names = "tx", "rx";cdns,i2s-max-channels = <2>;#sound-dai-cells = <0>;- };
-- 2.25.1