2017年1月17日 22:02于 Mylène Josserand <mylene.josserand@xxxxxxxxxxxxxxxxxx>写道：
>
> Add a new compatible for sun4i-i2s driver to handle some
> SoCs that have a reset line that must be asserted/deasserted.
>
> This new compatible, "allwinner,sun6i-a31-i2s", requires two
> properties:
> - resets: phandle to the reset line
> - reset-names: the name of the reset line ("rst").
> Except these differences, the compatible is identical to previous one
> which will not handle a reset line.
But I think the IP block is identical, right?
Should a new compatible be added only for reset-line?
>
> Signed-off-by: Mylène Josserand <mylene.josserand@xxxxxxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/sound/sun4i-i2s.txt | 23 ++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> index 7a2c0945fd22..f673206e309b 100644
> --- a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> +++ b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> @@ -7,6 +7,7 @@ Required properties:
>
> - compatible: should be one of the following:
> - "allwinner,sun4i-a10-i2s"
> + - "allwinner,sun6i-a31-i2s" for controller with reset lines
> - reg: physical base address of the controller and length of memory mapped
> region.
> - interrupts: should contain the I2S interrupt.
> @@ -19,7 +20,13 @@ Required properties:
> - "mod" : module clock for the I2S controller
> - #sound-dai-cells : Must be equal to 0
>
> +Required properties for the following compatibles:
> + - "allwinner,sun6i-a31-i2s"
> +- resets: phandle to the reset line for this codec
> +- reset-names: Contains the reset signal name "rst"
> +
> Example:
> +For "allwinner,sun4i-a10-i2s":
>
> i2s0: i2s@01c22400 {
> #sound-dai-cells = <0>;
> @@ -32,3 +39,19 @@ i2s0: i2s@01c22400 {
> <&dma SUN4I_DMA_NORMAL 3>;
> dma-names = "rx", "tx";
> };
> +
> +For "allwinner,sun6i-a31-i2s":
> +
> +dai: dai@01c22c00 {
> + #sound-dai-cells = <0>;
> + compatible = "allwinner,sun6i-a31-i2s";
> + reg = <0x01c22c00 0x200>;
> + interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&ccu CLK_BUS_CODEC>, <&ccu CLK_AC_DIG>;
> + clock-names = "apb", "mod";
> + resets = <&ccu RST_BUS_CODEC>;
> + reset-names = "rst";
> + dmas = <&dma 15>, /* AUDIO_CODEC port */
> + <&dma 15>; /* AUDIO_CODEC port */
> + dma-names = "rx", "tx";
> +};
> --
> 2.11.0
>
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