linux-kernel - Re: [PATCH v5 03/12] dt-binding: gce: add binding for gce subsys property

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Message-ID: <20190507174110.GA6767@bogus>
Date:   Tue, 7 May 2019 12:41:10 -0500
From:   Rob Herring <robh@...nel.org>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        CK HU <ck.hu@...iatek.com>,
        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 v5 03/12] dt-binding: gce: add binding for gce subsys
 property

On Tue, May 07, 2019 at 04:13:46PM +0800, Bibby Hsieh wrote:
> tcmdq 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>
> ---
>  .../devicetree/bindings/mailbox/mtk-gce.txt       | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> index 1f7f8f2a3f49..8fd9479bc9f6 100644
> --- a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> +++ b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> @@ -21,11 +21,19 @@ Required properties:
>  	priority: Priority of GCE thread.
>  	atomic_exec: GCE processing continuous packets of commands in atomic
>  		way.
> +- #subsys-cells: Should be 3.
> +	<&phandle subsys_number start_offset size>
> +	phandle: Label name of a gce node.
> +	subsys_number: specify the sub-system id which is corresponding
> +		       to the register address.
> +	start_offset: the start offset of register address that GCE can access.
> +	size: the total size of register address that GCE can access.

Like the #event-cells, do you need this if it isn't variable?

>  
>  Required properties for a client device:
>  - mboxes: Client use mailbox to communicate with GCE, it should have this
>    property and list of phandle, mailbox specifiers.
> -- mediatek,gce-subsys: u32, specify the sub-system id which is corresponding
> +Optional propertier for a client device:
> +- mediatek,gce-client-reg: u32, specify the sub-system id which is corresponding
>    to the register address.

This isn't a u32, but a phandle + 3 cells (or a list of those). How many 
entries can there be?

>  
>  Some vaules of properties are defined in 'dt-bindings/gce/mt8173-gce.h'
> @@ -40,6 +48,7 @@ Example:
>  		clocks = <&infracfg CLK_INFRA_GCE>;
>  		clock-names = "gce";
>  		#mbox-cells = <3>;
> +		#subsys-cells = <3>;
>  	};
>  
>  Example for a client device:
> @@ -48,9 +57,9 @@ 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>;
>  		mutex-event-eof = <CMDQ_EVENT_MUTEX0_STREAM_EOF
>  				CMDQ_EVENT_MUTEX1_STREAM_EOF>;
> -
> +		mediatek,gce-client-reg = <&gce SUBSYS_1400XXXX 0x3000 0x1000>,
> +					  <&gce SUBSYS_1401XXXX 0x2000 0x100>;
>  		...
>  	};
> -- 
> 2.18.0
>