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Date: Wed, 16 Jun 2021 18:00:18 -0600
From: Rob Herring <robh@...nel.org>
To: Ming Qian <ming.qian@....com>
Cc: mchehab@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
hverkuil-cisco@...all.nl, kernel@...gutronix.de,
festevam@...il.com, linux-imx@....com, aisheng.dong@....com,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/13] dt-bindings: media: imx8q: add imx video codec
bindings
On Mon, Jun 07, 2021 at 04:42:48PM +0800, Ming Qian wrote:
> Add devicetree binding documentation for IMX8Q Video Processing Unit IP
>
> Signed-off-by: Ming Qian <ming.qian@....com>
> Signed-off-by: Shijie Qin <shijie.qin@....com>
> Signed-off-by: Zhou Peng <eagle.zhou@....com>
> ---
> .../bindings/media/nxp,imx8q-vpu.yaml | 198 ++++++++++++++++++
> 1 file changed, 198 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/nxp,imx8q-vpu.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/nxp,imx8q-vpu.yaml b/Documentation/devicetree/bindings/media/nxp,imx8q-vpu.yaml
> new file mode 100644
> index 000000000000..058ca69c107a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/nxp,imx8q-vpu.yaml
> @@ -0,0 +1,198 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/nxp,imx8q-vpu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX8Q video encode and decode accelerators
> +
> +maintainers:
> + - Ming Qian <ming.qian@....com>
> + - Shijie Qin <shijie.qin@....com>
> +
> +description: |-
> + The Amphion MXC video encoder(Windsor) and decoder(Malone) accelerators present
> + on NXP i.MX8Q SoCs.
> +
> +allOf:
> + - $ref: /schemas/simple-bus.yaml#
This is not a 'simple-bus'. A simple bus doesn't have power-domains,
memory-region, or mailbox.
simple-mfd maybe, but looks like there's dependencies here so you should
trigger probing yourself.
> +
> +properties:
> + $nodename:
> + pattern: "^vpu-bus@[0-9a-f]+$"
> +
> + compatible:
> + contains:
No, must be exact.
> + items:
> + - enum:
> + - nxp,imx8qm-vpu
> + - nxp,imx8qxp-vpu
> +
> + reg:
> + maxItems: 1
> +
> + power-domains:
> + maxItems: 1
> +
> + memory-region:
> + description:
> + Phandle to a node describing reserved memory used by VPU.
> + (see bindings/reserved-memory/reserved-memory.txt)
> +
> + mailbox:
This needs to be a pattern looking at the example.
> + description:
> + Each vpu encoder or decoder correspond a MU, which used for communication
> + between driver and firmware. Implement via mailbox on driver.
> + (see bindings/mailbox/fsl,mu.yaml)
Do a $ref to the file.
> +
> +patternProperties:
> + "^vpu_[en, de]coder@[0-9a-f]+$":
(en|de)
> + type: object
> + description:
> + Each core correspond a decoder or encoder, need to configure them
> + separately. NXP i.MX8QM SoC has one decoder and two encoder, i.MX8QXP SoC
> + has one decoder and one encoder.
> +
> + properties:
> + compatible:
> + oneOf:
> + - const: nxp,imx8q-vpu-decoder
> + - const: nxp,imx8q-vpu-encoder
> +
> + reg:
> + maxItems: 1
> +
> + power-domains:
> + maxItems: 1
> +
> + mbox-names:
> + items:
> + - const: tx0
> + - const: tx1
> + - const: rx
> +
> + mboxes:
> + description:
> + List of phandle of 2 MU channels for tx, 1 MU channel for rx.
How many? (maxItems: 1 or an 'items' list needed)
> + boot-region:
> + description:
> + Phandle to a node describing reserved memory used by firmware
> + loading.
> +
> + rpc-region:
> + description:
> + Phandle to a node describing reserved memory used by RPC shared
> + memory between firmware and driver.
> +
> + print-offset:
> + description:
> + The memory offset from RPC address, used by reserve firmware log.
These need vendor prefix and type ref.
> +
> + id:
> + description: Index of vpu core.
Nope. We don't do indexes.
> +
> + required:
> + - compatible
> + - reg
> + - power-domains
> + - mbox-names
> + - mboxes
> + - boot-region
> + - rpc-region
> + - print-offset
> + - id
> +
> + additionalProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - power-domains
> + - memory-region
> +
> +additionalProperties: true
> +
> +examples:
> + # Device node example for i.MX8QM platform:
> + - |
> + #include <dt-bindings/firmware/imx/rsrc.h>
> +
> + vpu: vpu-bus@...00000 {
> + compatible = "nxp,imx8qm-vpu", "simple-bus";
> + ranges = <0x2c000000 0x2c000000 0x2000000>;
> + reg = <0x2c000000 0x1000000>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + power-domains = <&pd IMX_SC_R_VPU>;
> + memory-region = <&vpu_reserved>;
> +
> + mu_m0: mailbox@...00000 {
> + compatible = "fsl,imx6sx-mu";
> + reg = <0x2d000000 0x20000>;
> + interrupts = <0 472 4>;
> + #mbox-cells = <2>;
> + power-domains = <&pd IMX_SC_R_VPU_MU_0>;
> + };
> +
> + mu1_m0: mailbox@...20000 {
> + compatible = "fsl,imx6sx-mu";
> + reg = <0x2d020000 0x20000>;
> + interrupts = <0 473 4>;
> + #mbox-cells = <2>;
> + power-domains = <&pd IMX_SC_R_VPU_MU_1>;
> + };
> +
> + mu2_m0: mailbox@...40000 {
> + compatible = "fsl,imx6sx-mu";
> + reg = <0x2d040000 0x20000>;
> + interrupts = <0 474 4>;
> + #mbox-cells = <2>;
> + power-domains = <&pd IMX_SC_R_VPU_MU_2>;
> + };
> +
> + vpu_core0: vpu_decoder@...80000 {
> + compatible = "nxp,imx8q-vpu-decoder";
> + reg = <0x2d080000 0x10000>;
> + power-domains = <&pd IMX_SC_R_VPU_DEC_0>;
> + mbox-names = "tx0", "tx1", "rx";
> + mboxes = <&mu_m0 0 0
> + &mu_m0 0 1
> + &mu_m0 1 0>;
> + boot-region = <&decoder_boot>;
> + rpc-region = <&decoder_rpc>;
> + print-offset = <0x180000>;
> + id = <0>;
> + };
> +
> + vpu_core1: vpu_encoder@...90000 {
> + compatible = "nxp,imx8q-vpu-encoder";
> + reg = <0x2d090000 0x10000>;
> + power-domains = <&pd IMX_SC_R_VPU_ENC_0>;
> + mbox-names = "tx0", "tx1", "rx";
> + mboxes = <&mu1_m0 0 0
> + &mu1_m0 0 1
> + &mu1_m0 1 0>;
> + boot-region = <&encoder1_boot>;
> + rpc-region = <&encoder1_rpc>;
> + print-offset = <0x80000>;
> + id = <1>;
> + };
> +
> + vpu_core2: vpu_encoder@...a0000 {
> + reg = <0x2d0a0000 0x10000>;
> + compatible = "nxp,imx8q-vpu-encoder";
> + power-domains = <&pd IMX_SC_R_VPU_ENC_1>;
> + mbox-names = "tx0", "tx1", "rx";
> + mboxes = <&mu2_m0 0 0
> + &mu2_m0 0 1
> + &mu2_m0 1 0>;
> + boot-region = <&encoder2_boot>;
> + rpc-region = <&encoder2_rpc>;
> + print-offset = <0x80000>;
> + id = <2>;
> + };
> + };
> +
> +...
> --
> 2.31.1
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