On Wed, Jan 31, 2018 at 03:42:44PM +0800, Ryder Lee wrote:
> As the MediaTek audio hardware block that expose functionalities that are
> handled by separate subsystems in the kernel, and there are registers that
> are shared between related drivers.
>
> Switch the current device to an MFD device, add more descriptions about the
> subsystem and modify example accordingly.
>
> Signed-off-by: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
> ---
> .../bindings/arm/mediatek/mediatek,audsys.txt | 37 ++++++++++++++++++----
> 1 file changed, 30 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.txt b/Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.txt
> index 9b8f578..677af40 100644
> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.txt
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.txt
> @@ -1,22 +1,45 @@
> -MediaTek AUDSYS controller
> +MediaTek Audio Subsystem
> ============================
> +The audio subsystem is one of the multi-function blocks of MediaTek SoCs.
> +It contains a system controller, which provides a number registers giving
> +access to two features: AUDSYS clocks and Audio Front End (AFE) components.
>
> +For the top level node:
> +- compatible: must be: "syscon", "simple-mfd";
This should have some SoC specific compatible.
> +- reg: register area of the Audio Subsystem
> +
> +Required sub-nodes:
> +
> +AUDSYS clocks:
> +-------
> The MediaTek AUDSYS controller provides various clocks to the system.
>
> Required Properties:
>
> - compatible: Should be one of:
> - - "mediatek,mt7622-audsys", "syscon"
> + - "mediatek,mt2701-audsys";
> + - "mediatek,mt7622-audsys";
> - #clock-cells: Must be 1
>
> The AUDSYS controller uses the common clk binding from
> Documentation/devicetree/bindings/clock/clock-bindings.txt
> The available clocks are defined in dt-bindings/clock/mt*-clk.h.
There's no register range associated with the clocks? If there is, add a
reg property.
>
> +AFE components:
> +-------
> +For common binding part and usage, refer to
> +../sonud/mt2701-afe-pcm.txt.
> +
> Example:
>
> -audsys: audsys@11220000 {
> - compatible = "mediatek,mt7622-audsys", "syscon";
> - reg = <0 0x11220000 0 0x1000>;
> - #clock-cells = <1>;
> -};
> + audio-subsystem@11220000 {
> + compatible = "syscon", "simple-mfd";
> + reg = <0 0x11220000 0 0x2000>;
> +
> + audsys: clock {
> + compatible = "mediatek,mt2701-audsys";
> + #clock-cells = <1>;
> + };
> +
> + ...
> + };
> --
> 1.9.1
>
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