linux-kernel - Re: [PATCH v2 03/10] dt-binding: gce: add binding for gce subsys property

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Date:   Thu, 7 Mar 2019 10:20:55 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
CC:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        Nicolas Boichat <drinkcat@...omium.org>,
        "YT Shen" <yt.shen@...iatek.com>,
        Daoyuan Huang <daoyuan.huang@...iatek.com>,
        Jiaguang Zhang <jiaguang.zhang@...iatek.com>,
        Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <ginny.chen@...iatek.com>, <kendrick.hsu@...iatek.com>,
        Frederic Chen <Frederic.Chen@...iatek.com>
Subject: Re: [PATCH v2 03/10] dt-binding: gce: add binding for gce subsys
 property

Hi, Bibby:

On Thu, 2019-03-07 at 09:39 +0800, CK Hu wrote:
> Hi, Bibby:
> 
> On Wed, 2019-03-06 at 17:50 +0800, Bibby Hsieh wrote:
> > cmdq driver provide a function that get the relationship
> > of sub system number from device node for client.
> > add specification for #subsys-cells, mediatek,gce-subsys.
> > 
> > Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/mailbox/mtk-gce.txt | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> > index 812698f..07b2adf 100644
> > --- a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> > +++ b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> > @@ -26,6 +26,13 @@ Required properties:
> >  	phandle: Label name of a gce node.
> >  	event_number: the event number defined in 'dt-bindings/gce/mt8173-gce.h'
> >  		      or 'dt-binding/gce/mt8183-gce.h'.
> > +#subsys-cells: Should be 2.
> > +	<&phandle register_base_address subsys_number>
> > +	phandle: Label name of a gce node.
> > +	register_base_address: the register base address that client
> > +			       want to write or read.
> 
> This look like the same as 'reg' property. I would prefer use
> already-defined property, for example:
> 
> 		mmsys: clock-controller@...00000 {
> 			compatible = "mediatek,mt8173-mmsys", "syscon";
> 			reg = <0 0x14000000 0 0x1000>;
> 			mediatek,gce-subsys = <&gce SUBSYS_1400XXXX>;
> 		};

My previous thinking may not be proper, GCE could write register but its
behavior may be not the same as CPU, so it's better not to mix these two
register_base_address.

Regards,
CK

> 
> Regards,
> CK
> 
> > +	subsys_number: specify the sub-system id which is corresponding
> > +		       to the register address.
> >  
> >  Required properties for a client device:
> >  - mboxes: Client use mailbox to communicate with GCE, it should have this
> > @@ -50,6 +57,7 @@ Example:
> >  		thread-num = CMDQ_THR_MAX_COUNT;
> >  		#mbox-cells = <3>;
> >  		#event-cells = <1>;
> > +		#subsys-cells = <2>;
> >  	};
> >  
> >  Example for a client device:
> > @@ -58,7 +66,8 @@ Example for a client device:
> >  		compatible = "mediatek,mt8173-mmsys";
> >  		mboxes = <&gce 0 CMDQ_THR_PRIO_LOWEST 1>,
> >  			 <&gce 1 CMDQ_THR_PRIO_LOWEST 1>;
> > -		mediatek,gce-subsys = <SUBSYS_1400XXXX>;
> > +		mediatek,gce-subsys = <&gce 0x14000000 SUBSYS_1400XXXX>,
> > +				      <&gce 0x14010000 SUBSYS_1401XXXX>;
> >  		mediatek,gce-event-names = "rdma0_sof",
> >  					   "rsz0_sof";
> >  		mediatek,gce-events = <&gce CMDQ_EVENT_MDP_RDMA0_SOF>,
>