On Mon, Feb 13, 2017 at 04:17:31PM +0800, Baoyou Xie wrote:
> This patch adds dt-binding documentation for zte's tdm controller.
>
> Signed-off-by: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
"bindings doc" instead of "documentation" in patch subject is more
clear.
> ---
> .../devicetree/bindings/sound/zte,tdm.txt | 32 ++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/sound/zte,tdm.txt
>
> diff --git a/Documentation/devicetree/bindings/sound/zte,tdm.txt b/Documentation/devicetree/bindings/sound/zte,tdm.txt
> new file mode 100644
> index 0000000..f6e4f7f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/zte,tdm.txt
> @@ -0,0 +1,32 @@
> +ZTE TDM DAI driver
> +
> +Required properties:
> +
> +- compatible : should be one of the following.
> + * zte,zx-tdm
We usually use particular SoC name (e.g. zx296702) rather than family
name (e.g. zx or zx2967) in the compatible string to specify the
programming model, because that's more explicit.
> +- reg : physical base address of the controller and length of memory mapped
> + region.
> +- clocks : Pairs of phandle and specifier referencing the controller's clocks.
> +- clock-names: "tdm_wclk" for the wclk.
> + "tdm_pclk" for the pclk.
The "tdm_" prefix in the name is redundant, as it's in tdm context
anyway.
> +-#clock-cells: should be 1.
> +- zte,tdm-dma-sysctrl : Reference to the sysctrl controller controlling
> + the dma. includes:
> + phandle of sysctrl.
> + register offset in sysctrl for control dma.
> + mask of the register that be written to dma.
> + value of the register that be written to dma.
written to dma? I think it gets written to sysctrl block.
> +
> +Example:
> +
> + tdm: tdm@1487000 {
> + compatible = "zte,zx-tdm";
> + reg = <0x01487000 0x1000>;
> + clocks = <&audiocrm AUDIO_TDM_WCLK>, <&audiocrm AUDIO_TDM_PCLK>;
> + clock-names = "tdm_wclk", "tdm_pclk";
> + #clock-cells = <1>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&tdm_global_pin>;
> + zte,tdm-dma-sysctrl = <&sysctrl 0x10c 0xf 0xf>;
I think we only need to set up bit 2 instead of bits [3:0], since we
only need to select dma channel 20 and 21 for PCM/TDM from UART5.
> + status = "ok";
We usually use "okay" instead of "ok" for status. For example in
bindings doc, I would suggest that we simply omit 'status' property.
Shawn
> + };
> --
> 2.7.4
>
>
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