linux-kernel - Re: [PATCH v2 1/2] dt-bindings: mailbox: Convert mtk-gce to DT schema

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Message-ID: <20220916141703.GA271453-robh@kernel.org>
Date:   Fri, 16 Sep 2022 09:17:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     jassisinghbrar@...il.com, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, houlong.wei@...iatek.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] dt-bindings: mailbox: Convert mtk-gce to DT schema

On Fri, Sep 16, 2022 at 10:07:41AM +0200, AngeloGioacchino Del Regno wrote:
> Convert the mtk-gce mailbox binding to DT schema format.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> 
> A previous attempt for this was made at [1], but it was changing
> the way of getting clocks (by name for all).
> Keeping clock-names not required for the multi-gce case makes this
> binding simpler, hence I chose to abandon the change at [1] and go
> for this one instead.
> 
> Any Reviewed-by or Acked-by tag was dropped, as this conversion was
> completely redone from scratch and differs from [1] for the
> aforementioned reasons.
> 
> [1]: https://lore.kernel.org/all/20220524151512.247435-1-angelogioacchino.delregno@collabora.com/
> 
>  .../mailbox/mediatek,gce-mailbox.yaml         | 104 ++++++++++++++++++
>  .../devicetree/bindings/mailbox/mtk-gce.txt   |  82 --------------
>  2 files changed, 104 insertions(+), 82 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
> new file mode 100644
> index 000000000000..ac6ca7fc5302
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
> @@ -0,0 +1,104 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/mediatek,gce-mailbox.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek Global Command Engine Mailbox
> +
> +maintainers:
> +  - Houlong Wei <houlong.wei@...iatek.com>
> +
> +description: |

Don't need '|' if not formatting to preserve.

> +  The Global Command Engine (GCE) is used to help read/write registers with
> +  critical time limitation, such as updating display configuration during the
> +  vblank. The GCE can be used to implement the Command Queue (CMDQ) driver.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt6779-gce
> +      - mediatek,mt8173-gce
> +      - mediatek,mt8183-gce
> +      - mediatek,mt8186-gce
> +      - mediatek,mt8192-gce
> +      - mediatek,mt8195-gce
> +
> +  "#mbox-cells":
> +    const: 2
> +    description:
> +      The first cell describes the Thread ID of the GCE,
> +      the second cell describes the priority of the GCE thread
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Global Command Engine clock
> +
> +  clock-names:
> +    items:
> +      - const: gce
> +
> +required:
> +  - compatible
> +  - "#mbox-cells"
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +if:
> +  not:
> +    properties:
> +      compatible:
> +        contains:
> +          const: mediatek,mt8195-gce
> +then:
> +  required:
> +    - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  # Example for a device client and for a MediaTek mutex client
> +  - |
> +    #include <dt-bindings/clock/mt8173-clk.h>
> +    #include <dt-bindings/gce/mt8173-gce.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/power/mt8173-power.h>
> +
> +    gce: mailbox@...20000 {
> +        compatible = "mediatek,mt8173-gce";
> +        reg = <0x10816000 0x1000>;
> +        interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>;
> +        #mbox-cells = <2>;
> +        clocks = <&infracfg CLK_INFRA_GCE>;
> +        clock-names = "gce";
> +    };
> +
> +    syscon@...00000 {
> +        compatible = "mediatek,mt8173-mmsys", "syscon";
> +        reg = <0x14000000 0x1000>;
> +        power-domains = <&spm MT8173_POWER_DOMAIN_MM>;
> +        #clock-cells = <1>;
> +        #reset-cells = <1>;
> +        mboxes = <&gce 0 CMDQ_THR_PRIO_HIGHEST>,
> +                 <&gce 1 CMDQ_THR_PRIO_HIGHEST>;
> +        mediatek,gce-client-reg = <&gce SUBSYS_1400XXXX 0 0x1000>;

Provider binding examples don't normally show clients in examples (and 
vice-versa). Presumably we already have this in the 
"mediatek,mt8173-mmsys" binding.

> +    };
> +
> +    mutex@...20000 {
> +        compatible = "mediatek,mt8173-disp-mutex";
> +        reg = <0x14020000 0x1000>;
> +        interrupts = <GIC_SPI 169 IRQ_TYPE_LEVEL_LOW>;
> +        power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
> +        clocks = <&mmsys CLK_MM_MUTEX_32K>;
> +        mediatek,gce-client-reg = <&gce SUBSYS_1402XXXX 0 0x1000>;
> +        mediatek,gce-events = <CMDQ_EVENT_MUTEX0_STREAM_EOF>,
> +                              <CMDQ_EVENT_MUTEX1_STREAM_EOF>;

ditto.