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

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Message-ID: <1552009283.2863.12.camel@mtksdaap41>
Date:   Fri, 8 Mar 2019 09:41:23 +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 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.
> +	subsys_number: specify the sub-system id which is corresponding
> +		       to the register address.

I would like this description similar to 'reg' property. For example:

If a client want GCE to access register from 0x14002000 ~ 0x14002fff,
in the view of GCE, it would access register from SUBSYS_1400XXXX with
an offset 0x2000 to SUBSYS_1400XXXX with an offset 0x2fff
So the description could be:

mediatek,gce-client-reg = <&gce SUBSYS_1400XXXX 0x2000 0x1000>

the second parameter is subsys, the third parameter is start offset, and
the fourth parameter is the size.

I change the property name to 'mediatek,gce-client-reg' because this
whole property describe the range GCE access rather than the subsys. 

Regards,
CK

>  
>  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>,