linux-kernel - Re: [PATCH 01/15] dt-bindings: mailbox: Add property for CMDQ secure driver

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Date:   Tue, 19 Sep 2023 11:46:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Jason-ch Chen <jason-ch.chen@...iatek.com>,
        Johnson Wang <johnson.wang@...iatek.com>,
        Elvis Wang <Elvis.Wang@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Shawn Sung <shawn.sung@...iatek.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 01/15] dt-bindings: mailbox: Add property for CMDQ secure
 driver

On Tue, Sep 19, 2023 at 03:21:50AM +0800, Jason-JH.Lin wrote:
> Add mboxes to define a GCE loopping thread as a secure irq handler.
> Add mediatek,event to define a GCE software event siganl as a secure
> irq.
> 
> These 2 properties are required for CMDQ secure driver.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> ---
>  .../mailbox/mediatek,gce-mailbox.yaml         | 30 +++++++++++++++----
>  1 file changed, 24 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
> index cef9d7601398..5c9aebe83d2d 100644
> --- a/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
> +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
> @@ -49,6 +49,21 @@ properties:
>      items:
>        - const: gce
>  
> +  mboxes:
> +    description:
> +      A mailbox channel used as a secure irq handler in normal world.
> +      Using mailbox to communicate with GCE to setup looping thread,
> +      it should have this property and a phandle, mailbox specifiers.

All cases of 'mboxes' have a phandle and specifiers. No need to repeat 
that here.

> +    $ref: /schemas/types.yaml#/definitions/phandle-array

Already has a type definition too. You need to define how many entries 
and what each entry is if more than one. IOW, the same thing as clocks, 
resets, interrupts, etc.

> +
> +  mediatek,gce-events:

This is used all over. It really needs a single definition which is then 
referenced by the users.

> +    description:
> +      The event id which is mapping to a software event signal to gce.
> +      It is used as a secure irq for every secure gce threads.
> +      The event id is defined in the gce header
> +      include/dt-bindings/mailbox/mediatek,<chip>-gce.h of each chips.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +
>  required:
>    - compatible
>    - "#mbox-cells"
> @@ -71,20 +86,23 @@ additionalProperties: false
>  
>  examples:
>    - |
> -    #include <dt-bindings/clock/mt8173-clk.h>
> +    #include <dt-bindings/clock/mediatek,mt8188-clk.h>
>      #include <dt-bindings/interrupt-controller/arm-gic.h>
>      #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/mailbox/mediatek,mt8188-gce.h>
>  
>      soc {
>          #address-cells = <2>;
>          #size-cells = <2>;
>  
> -        gce: mailbox@...12000 {
> -            compatible = "mediatek,mt8173-gce";
> -            reg = <0 0x10212000 0 0x1000>;
> -            interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>;
> +        gce0: mailbox@...20000 {
> +            compatible = "mediatek,mt8188-gce";

Are these new properties only for mt8188? If so, then you need a schema 
saying that. If not, then this is an unnecessary change to the example.

> +            reg = <0 0x10320000 0 0x4000>;
> +            interrupts = <GIC_SPI 226 IRQ_TYPE_LEVEL_HIGH 0>;
>              #mbox-cells = <2>;
> -            clocks = <&infracfg CLK_INFRA_GCE>;
> +            clocks = <&infracfg_ao CLK_INFRA_AO_GCE>;
>              clock-names = "gce";
> +            mboxes = <&gce0 15 CMDQ_THR_PRIO_1>;

The provider is also a consumer?

> +            mediatek,gce-events = <CMDQ_SYNC_TOKEN_SECURE_THR_EOF>;
>          };
>      };
> -- 
> 2.18.0
>