linux-kernel - Re: [PATCH v2 4/5] dt-bindings: clock: mediatek: update audsys documentation to adapt MFD device

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Date:   Mon, 5 Feb 2018 00:08:33 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ryder Lee <ryder.lee@...iatek.com>
Cc:     Stephen Boyd <sboyd@...eaurora.org>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, Garlic Tseng <garlic.tseng@...iatek.com>
Subject: Re: [PATCH v2 4/5] dt-bindings: clock: mediatek: update audsys
 documentation to adapt MFD device

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@...iatek.com>
> ---
>  .../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@...20000 {
> -	compatible = "mediatek,mt7622-audsys", "syscon";
> -	reg = <0 0x11220000 0 0x1000>;
> -	#clock-cells = <1>;
> -};
> +	audio-subsystem@...20000 {
> +		compatible = "syscon", "simple-mfd";
> +		reg = <0 0x11220000 0 0x2000>;
> +
> +		audsys: clock {
> +			compatible = "mediatek,mt2701-audsys";
> +			#clock-cells = <1>;
> +		};
> +
> +		...
> +	};
> -- 
> 1.9.1
>