Re: [PATCH v6, 1/8] dt-bindings: media: mediatek: vcodec: Adds encoder cores dt-bindings for mt8195

Krzysztof Kozlowski
2022-10-19T02:22:54Z

On 30/09/2022 23:17, Irui Wang wrote:
> mt8195 has two H264 encoder hardware, which are named core0 and core1.
> The two encoder cores are independent, we can just enable one core to
> do encoding or enable both of them to achieve higher performance. We
> pick core0 as main device and core1 as its subdevice, it just a way to
> to manage the two encoder hardware, because they are two equal encoder
> hardware with the same function.
>

You have redundant dt-bindings (second one) in the subject. Drop it.

> Signed-off-by: Irui Wang <irui.wang@mediatek.com>
> ---
> .../media/mediatek,vcodec-encoder-core.yaml | 217 ++++++++++++++++++
> .../media/mediatek,vcodec-encoder.yaml | 1 -
> 2 files changed, 217 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/media/mediatek,vcodec-encoder-core.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder-core.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder-core.yaml
> new file mode 100644
> index 000000000000..1dda7d7908da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder-core.yaml
> @@ -0,0 +1,217 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/media/mediatek,vcodec-encoder-core.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: MediaTek Video Encoder Accelerator With Multi Core
> +
> +maintainers:
> + - Irui Wang <irui.wang@mediatek.com>
> +
> +description: |
> + MediaTek Video Encoder is the video encoder hardware present in MediaTek
> + SoCs which supports high resolution encoding functionalities. To meet higher
> + encoder performance, there will be one or more encoder hardware inside SoC,
> + which named core0, core1, etc.. For example, mt8195 has two encoder hardware,
> + the two encoder cores block diagram, can check below.
> + --------------------------------------------------------------
> + Input frame 0 1 2 3 4 5 6
> + | | | | | | |
> + v | v | v | v
> + +-------+ | +-------+ | +-------+ | +-------+
> + | core0 | | | core0 | | | core0 | | | core0 |
> + +-------+ | +-------+ | +-------+ | +-------+
> + | | | | | | |
> + | v | v | v |
> + | +-------+ | +-------+ | +-------+ |
> + | | core1 | | | core1 | | | core1 | |
> + | +-------+ | +-------+ | +-------+ |
> + | | | | | | |
> + v v v v v v v <parent>
> + --------------------------------------------------------------
> + core || index <child>
> + \/
> + +--------------------------------------------------+
> + | core0/core1 |
> + | enable/disable power/clk/irq |
> + +--------------------------------------------------+
> + --------------------------------------------------------------
> + As above, there are two cores child devices, they are two encoder hardware
> + which can encode input frames in order. When start encoding, input frame 0
> + will be encoded by core0, and input frame 1 can be encoded by core1 even if
> + frame 0 has not been encoded done yet, after frame 0 encoded done, frame 2
> + will be encoded by core0, even input frames are encoded by core0 and odd
> + input frames are encoded by core1, these two encoder cores encode ench input
> + frames in this overlapping manner.
> +
> +properties:
> + compatible:
> + items:

Drop items (you have only one item).

> + - enum:
> + - mediatek,mt8195-vcodec-enc
> +
> + reg:
> + maxItems: 1
> +
> + mediatek,scp:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description: |
> + The node of system control processor (SCP), using
> + the remoteproc & rpmsg framework.
> +
> + iommus:
> + minItems: 1
> + maxItems: 32
> + description: |
> + List of the hardware port in respective IOMMU block for current Socs.
> + Refer to bindings/iommu/mediatek,iommu.yaml.

Drop the path, is rather obvious (and actually not correct, because it
misses include).

> +
> + interrupts:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + maxItems: 1
> +
> + power-domains:
> + maxItems: 1
> +
> + dma-ranges:
> + maxItems: 1
> + description: |
> + Describes the physical address space of IOMMU maps to memory.
> +
> + "#address-cells":
> + const: 2
> +
> + "#size-cells":
> + const: 2
> +
> + ranges: true
> +
> +# Required child node:
> +patternProperties:
> + "^venc-core@[0-9a-f]+$":

Didn't we have a big discussion that these should be called differently?
Maybe the hardware is different... but maybe not.

https://lore.kernel.org/all/20220930112237.14411-2-allen-kh.cheng@mediatek.com/

> + type: object
> + description: |
> + The video encoder core device node which should be added as subnodes to
> + the main venc node, it represents a encoder hardware.
> +
> + properties:
> + compatible:
> + const: mediatek,mtk-venc-hw
> +
> + reg:
> + maxItems: 1
> +
> + mediatek,hw-id:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Current encoder core id. We use it to pick which one encoder core
> + will be used to encoding current input frame.

Isn't this coming from unit address? Why do you need some ID?

> +
> + iommus:
> + minItems: 1
> + maxItems: 32
> + description: |
> + List of the hardware port in respective IOMMU block for current Socs.
> + Refer to bindings/iommu/mediatek,iommu.yaml.

Also drop last line.

> +
> + interrupts:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + maxItems: 1
> +
> + power-domains:
> + maxItems: 1
> +
> + required:
> + - compatible
> + - reg
> + - mediatek,hw-id
> + - iommus
> + - interrupts
> + - clocks
> + - clock-names
> + - assigned-clocks
> + - assigned-clock-parents
> + - power-domains
> +
> + additionalProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - mediatek,scp
> + - iommus
> + - interrupts
> + - clocks
> + - clock-names
> + - dma-ranges
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/memory/mt8195-memory-port.h>
> + #include <dt-bindings/interrupt-controller/irq.h>
> + #include <dt-bindings/clock/mt8195-clk.h>
> + #include <dt-bindings/power/mt8195-power.h>
> +
> + soc {
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + venc: venc@1a020000 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> + compatible = "mediatek,mt8195-vcodec-enc";
> + reg = <0 0x1a020000 0 0x10000>;
> + mediatek,scp = <&scp>;
> + iommus = <&iommu_vdo M4U_PORT_L19_VENC_RCPU>,
> + <&iommu_vdo M4U_PORT_L19_VENC_REC>,
> + <&iommu_vdo M4U_PORT_L19_VENC_BSDMA>,
> + <&iommu_vdo M4U_PORT_L19_VENC_SV_COMV>,
> + <&iommu_vdo M4U_PORT_L19_VENC_RD_COMV>,
> + <&iommu_vdo M4U_PORT_L19_VENC_CUR_LUMA>,
> + <&iommu_vdo M4U_PORT_L19_VENC_CUR_CHROMA>,
> + <&iommu_vdo M4U_PORT_L19_VENC_REF_LUMA>,
> + <&iommu_vdo M4U_PORT_L19_VENC_REF_CHROMA>;
> + interrupts = <GIC_SPI 341 IRQ_TYPE_LEVEL_HIGH 0>;
> + clocks = <&vencsys CLK_VENC_VENC>;
> + clock-names = "clk_venc";
> + power-domains = <&spm MT8195_POWER_DOMAIN_VENC>;
> + dma-ranges = <0x1 0x0 0x0 0x40000000 0x0 0xfff00000>;
> + #address-cells = <2>;
> + #size-cells = <2>;
> + ranges;
> +
> + venc-core@1b020000 {
> + compatible = "mediatek,mtk-venc-hw";
> + reg = <0 0x1b020000 0 0x10000>;
> + mediatek,hw-id = <1>;
> + iommus = <&iommu_vpp M4U_PORT_L20_VENC_RCPU>,
> + <&iommu_vpp M4U_PORT_L20_VENC_REC>,
> + <&iommu_vpp M4U_PORT_L20_VENC_BSDMA>,
> + <&iommu_vpp M4U_PORT_L20_VENC_SV_COMV>,
> + <&iommu_vpp M4U_PORT_L20_VENC_RD_COMV>,
> + <&iommu_vpp M4U_PORT_L20_VENC_CUR_LUMA>,
> + <&iommu_vpp M4U_PORT_L20_VENC_CUR_CHROMA>,
> + <&iommu_vpp M4U_PORT_L20_VENC_REF_LUMA>,
> + <&iommu_vpp M4U_PORT_L20_VENC_REF_CHROMA>;
> + interrupts = <GIC_SPI 346 IRQ_TYPE_LEVEL_HIGH 0>;
> + clocks = <&vencsys_core1 CLK_VENC_CORE1_VENC>;
> + clock-names = "clk_venc_core1";
> + assigned-clocks = <&topckgen CLK_TOP_VENC>;
> + assigned-clock-parents = <&topckgen CLK_TOP_UNIVPLL_D4>;
> + power-domains = <&spm MT8195_POWER_DOMAIN_VENC_CORE1>;
> + };
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> index 32aee09aea33..f5f79efe3ba3 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> @@ -22,7 +22,6 @@ properties:
> - mediatek,mt8183-vcodec-enc
> - mediatek,mt8188-vcodec-enc
> - mediatek,mt8192-vcodec-enc
> - - mediatek,mt8195-vcodec-enc

Why? Commit msg did not explain this to me.

>
> reg:
> maxItems: 1

Best regards,
Krzysztof