linux-kernel - Re: [PATCH v2 1/3] dt-bindings: mediatek: add vdosys1 RDMA definition for mt8195

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Date:   Tue, 10 May 2022 10:23:24 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: mediatek: add vdosys1 RDMA definition
 for mt8195


On 5/9/22 4:45 PM, Rex-BC Chen wrote:
> On Mon, 2022-05-09 at 15:31 +0800, Krzysztof Kozlowski wrote:
>> On 09/05/2022 06:43, Rex-BC Chen wrote:
>>> From: "Nancy.Lin" <nancy.lin@...iatek.com>
>>>
>>> Add vdosys1 RDMA definition.
>>>
>>> Signed-off-by: Nancy.Lin <nancy.lin@...iatek.com>
>>> Reviewed-by: AngeloGioacchino Del Regno <
>>> angelogioacchino.delregno@...labora.com>
>>> ---
>>>   .../display/mediatek/mediatek,mdp-rdma.yaml   | 94
>>> +++++++++++++++++++
>>>   1 file changed, 94 insertions(+)
>>>   create mode 100644
>>> Documentation/devicetree/bindings/display/mediatek/mediatek,mdp-
>>> rdma.yaml
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/display/mediatek/mediatek,mdp-
>>> rdma.yaml
>>> b/Documentation/devicetree/bindings/display/mediatek/mediatek,mdp-
>>> rdma.yaml
>>> new file mode 100644
>>> index 000000000000..ca31accb0a95
>>> --- /dev/null
>>> +++
>>> b/Documentation/devicetree/bindings/display/mediatek/mediatek,mdp-
>>> rdma.yaml
>>> @@ -0,0 +1,94 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id:
>>> https://urldefense.com/v3/__http://devicetree.org/schemas/display/mediatek/mediatek,mdp-rdma.yaml*__;Iw!!CTRNKA9wMg0ARbw!x6pqRSLbN1fx6j57PKXCTTp8n7bulgpLzXS8uUh5vAIxkRKD8K6EqOopnFrXvT54LQXmIEDFFvPQzC4ldr1TddEeTw$
>>>   
>>> +$schema:
>>> https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!x6pqRSLbN1fx6j57PKXCTTp8n7bulgpLzXS8uUh5vAIxkRKD8K6EqOopnFrXvT54LQXmIEDFFvPQzC4ldr3y-9sW3w$
>>>   
>>> +
>>> +title: MediaTek MDP RDMA
>>> +
>>> +maintainers:
>>> +  - Chun-Kuang Hu <chunkuang.hu@...nel.org>
>>> +  - Philipp Zabel <p.zabel@...gutronix.de>
>>> +
>>> +description:
>>> +  The MediaTek MDP RDMA stands for Read Direct Memory Access.
>>> +  It provides real time data to the back-end panel driver, such as
>>> DSI,
>>> +  DPI and DP_INTF.
>>> +  It contains one line buffer to store the sufficient pixel data.
>>> +  RDMA device node must be siblings to the central MMSYS_CONFIG
>>> node.
>>> +  For a description of the MMSYS_CONFIG binding, see
>>> +  Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.ya
>>> ml for details.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    oneOf:
>> oneOf is not needed
>>
>>> +      - items:
>> items not needed, you have only one item.
>>
> Hello Krzysztof,
>
> Thanks for your review.
> ok, we will drop them.
>
>>> +          - const: mediatek,mt8195-vdo1-rdma
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  interrupts:
>>> +    maxItems: 1
>>> +
>>> +  power-domains:
>>> +    description: A phandle and PM domain specifier as defined by
>>> bindings of
>>> +      the power controller specified by phandle. See
>>> +      Documentation/devicetree/bindings/power/power-domain.yaml
>>> for details.
>> Skip description, it's obvious. Instead maxItems.
>>
> ok, we will fix it.
>
>>> +
>>> +  clocks:
>>> +    items:
>>> +      - description: RDMA Clock
>>> +
>>> +  iommus:
>>> +    description:
>>> +      This property should point to the respective IOMMU block
>>> with master port as argument,
>>> +      see
>>> Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml for
>>> details.
>> Skip description, it's obvious. Instead maxItems.
>>
> ok, we will fix it.
>
>>> +
>>> +  mediatek,gce-client-reg:
>>> +    description:
>>> +      The register of display function block to be set by gce.
>>> There are 4 arguments,
>>> +      such as gce node, subsys id, offset and register size. The
>>> subsys id that is
>>> +      mapping to the register of display function blocks is
>>> defined in the gce header
>>> +      include/include/dt-bindings/gce/<chip>-gce.h of each chips.
>> Double "include" in the path.
> ok, we will fix it.
>
>>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +    items:
>>> +      items:
>>> +        - description: phandle of GCE
>>> +        - description: GCE subsys id
>>> +        - description: register offset
>>> +        - description: register size
>>> +    maxItems: 1
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - power-domains
>>> +  - clocks
>>> +  - iommus
>>> +  - mediatek,gce-client-reg
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>>> +    #include <dt-bindings/clock/mt8195-clk.h>
>>> +    #include <dt-bindings/power/mt8195-power.h>
>>> +    #include <dt-bindings/gce/mt8195-gce.h>
>>> +    #include <dt-bindings/memory/mt8195-memory-port.h>
>>> +
>>> +    soc {
>>> +        #address-cells = <2>;
>>> +        #size-cells = <2>;
>>> +
>>> +        vdo1_rdma0: mdp-rdma@...04000 {
>> Generic node name. dma-controller (if it does not conflict with
>> dma-common.yaml schema)?
> We don't understand what dma-controller you are referring to? Can you
> help explain more? Thanks!
>
> BRs,
> Rex
Hello Krzysztof,


Could you also help us to explain what do you mean here?

Thanks!


BRs,

Rex
>>> +            compatible = "mediatek,mt8195-vdo1-rdma";
>>> +            reg = <0 0x1c104000 0 0x1000>;
>>> +            interrupts = <GIC_SPI 495 IRQ_TYPE_LEVEL_HIGH 0>;
>>> +            clocks = <&vdosys1 CLK_VDO1_MDP_RDMA0>;
>>> +            power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS1>;
>>> +            iommus = <&iommu_vdo M4U_PORT_L2_MDP_RDMA0>;
>>> +            mediatek,gce-client-reg = <&gce0 SUBSYS_1c10XXXX
>>> 0x4000 0x1000>;
>>> +        };
>>> +    };
>>
>> Best regards,
>> Krzysztof