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

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Message-ID: <1517821892.12510.32.camel@mtkswgap22>
Date:   Mon, 5 Feb 2018 17:11:32 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     <devicetree@...r.kernel.org>,
        Garlic Tseng <garlic.tseng@...iatek.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        <linux-kernel@...r.kernel.org>, "Mark Brown" <broonie@...nel.org>,
        <linux-mediatek@...ts.infradead.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Lee Jones <lee.jones@...aro.org>, <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 4/5] dt-bindings: clock: mediatek: update audsys
 documentation to adapt MFD device

On Mon, 2018-02-05 at 00:08 -0600, Rob Herring wrote:
> 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.

As we don't have a specific driver (compatible string) for it and if we
need to add that I think the term '*-audsys' is very suitable here, but
unfortunately, it has already picked for clock driver (see child node).

I also took ../../marvell/*-system-controller.txt as examples for my
case. Thus, I'm not sure should we still need a new one here?

> > +- 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.

No, we don't need reg property here, as the two sub-drivers will obtain
the regmap  which is propagated from the parent.

Thanks

> >  
> > +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
> > 
> 
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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