linux-kernel - Re: [PATCH v10 07/17] dt-bindings: display: mediatek: merge: add additional prop for mt8195

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Message-ID: <5ffef736524f3d7fb69f97332576ee9913032bcd.camel@pengutronix.de>
Date:   Wed, 08 Sep 2021 08:39:29 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     "jason-jh.lin" <jason-jh.lin@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        hsinyi@...omium.org, fshao@...omium.org,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        nancy.lin@...iatek.com, singo.chang@...iatek.com,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v10 07/17] dt-bindings: display: mediatek: merge: add
 additional prop for mt8195

Hi Jason,

On Wed, 2021-09-08 at 14:03 +0800, jason-jh.lin wrote:
> add MERGE additional properties description for mt8195:
> 1. async clock
> 2. fifo setting enable
> 3. reset controller
> 
> Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> ---
>  .../display/mediatek/mediatek,merge.yaml      | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,merge.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,merge.yaml
> index 75beeb207ceb..0fe204d9ad2c 100644
> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,merge.yaml
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,merge.yaml
> @@ -38,6 +38,19 @@ properties:
>    clocks:
>      items:
>        - description: MERGE Clock
> +      - description: MERGE Async Clock
> +          Controlling the synchronous process between MERGE and other display
> +          function blocks cross clock domain.
> +
> +  mediatek,merge-fifo-en:
> +    description:
> +      The setting of merge fifo is mainly provided for the display latency
> +      buffer to ensure that the back-end panel display data will not be
> +      underrun, a little more data is needed in the fifo.
> +      According to the merge fifo settings, when the water level is detected
> +      to be insufficient, it will trigger RDMA sending ultra and preulra
> +      command to SMI to speed up the data rate.
> +    type: boolean
>  
>    mediatek,gce-client-reg:
>      description:
> @@ -50,6 +63,10 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/phandle-array
>      maxItems: 1
>  
> +  resets:
> +    description: reset controller
> +      See Documentation/devicetree/bindings/reset/reset.txt for details.

>From the example this looks like it could have a maxItems: 1.

> +
>  required:
>    - compatible
>    - reg

Should the resets property be required for "mediatek,mt8195-disp-merge"?

> @@ -67,3 +84,16 @@ examples:
>          power-domains = <&spm MT8173_POWER_DOMAIN_MM>;
>          clocks = <&mmsys CLK_MM_DISP_MERGE>;
>      };
> +
> +    merge5: disp_vpp_merge5@...10000 {
> +        compatible = "mediatek,mt8195-disp-merge";
> +        reg = <0 0x1c110000 0 0x1000>;
> +        interrupts = <GIC_SPI 507 IRQ_TYPE_LEVEL_HIGH 0>;
> +        clocks = <&vdosys1 CLK_VDO1_VPP_MERGE4>,
> +                 <&vdosys1 CLK_VDO1_MERGE4_DL_ASYNC>;
> +        clock-names = "merge","merge_async";
> +        power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS1>;
> +        mediatek,gce-client-reg = <&gce1 SUBSYS_1c11XXXX 0x0000 0x1000>;
> +        mediatek,merge-fifo-en = <1>;
> +        resets = <&vdosys1 MT8195_VDOSYS1_SW0_RST_B_MERGE4_DL_ASYNC>;
> +    };

regards
Philipp