linux-kernel - Re: [PATCH v2 1/4] dt bindings: remoteproc: Add bindings for MT8183 APU

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Message-ID: <20200929173003.GA124290@xps15>
Date:   Tue, 29 Sep 2020 11:30:03 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Alexandre Bailon <abailon@...libre.com>
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        matthias.bgg@...il.com, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stephane.leprovost@...iatek.com, gpain@...libre.com
Subject: Re: [PATCH v2 1/4] dt bindings: remoteproc: Add bindings for MT8183
 APU

On Thu, Sep 10, 2020 at 03:01:45PM +0200, Alexandre Bailon wrote:
> This adds dt bindings for the APU present in the MT8183.
> 
> Signed-off-by: Alexandre Bailon <abailon@...libre.com>
> ---
>  .../bindings/remoteproc/mtk,apu.yaml          | 107 ++++++++++++++++++
>  1 file changed, 107 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/mtk,apu.yaml
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,apu.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,apu.yaml
> new file mode 100644
> index 000000000000..7a71d2f5c4e6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/mtk,apu.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +
> +---
> +$id: "http://devicetree.org/schemas/remoteproc/mtk,apu.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: MT8183 AI Processor Unit (APU) a.k.a. Vision Processor Unit (VPU)
> +
> +description:
> +  This document defines the binding for the APU, a co-processor that could
> +  offload the CPU for machine learning and neural network.
> +
> +maintainers:
> +  - Alexandre Bailon <abailon@...Libre.com>
> +
> +properties:
> +  compatible:
> +    const: mediatek,mt8183-apu
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      Three clocks are expected for AXI, IPU and JTAG.
> +      The JTAG clock seems to be required to run the DSP,
> +      even when JTAG is not in use."
> +    maxItems: 3
> +
> +  clock-names:
> +    items:
> +      - const: axi
> +      - const: ipu
> +      - const: jtag
> +
> +  iommus:
> +    maxItems: 3
> +
> +  memory-region:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  pinctrl:
> +    description: pinctrl handles, required to configure pins for JTAG.
> +
> +  pinctrl-names:
> +    items:
> +      - const: jtag
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - iommus
> +  - memory-region
> +  - power-domains
> +
> +additionalProperties: false
> +

What about the pintctrl for the JTAG part?

> +examples:
> +  - |
> +    #include <dt-bindings/clock/mt8183-clk.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/memory/mt8183-larb-port.h>
> +    #include <dt-bindings/power/mt8183-power.h>
> +
> +    reserved-memory {
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +      ranges;
> +
> +      apu_ram: apu_ram@...0000000 {
> +        compatible = "shared-dma-pool";
> +        reg = <0x60000000 0x040000000>;
> +        no-map;
> +        linux,cma-default;
> +      };
> +    };
> +
> +    apu0: apu@...00000 {
> +      compatible = "mediatek,mt8183-apu";
> +      reg = <0x19180000 0x14000>;
> +      interrupts = <GIC_SPI 292 IRQ_TYPE_LEVEL_LOW>;
> +
> +      iommus = <&iommu M4U_PORT_IMG_IPUO>,
> +         <&iommu M4U_PORT_IMG_IPU3O>,
> +         <&iommu M4U_PORT_IMG_IPUI>;
> +
> +      clocks = <&ipu_core0 CLK_IPU_CORE0_AXI>,
> +         <&ipu_core0 CLK_IPU_CORE0_IPU>,
> +         <&ipu_core0 CLK_IPU_CORE0_JTAG>;
> +
> +      clock-names = "axi", "ipu", "jtag";
> +
> +      power-domains = <&scpsys MT8183_POWER_DOMAIN_VPU_CORE0>;
> +      memory-region = <&apu_ram>;
> +    };
> +...
> -- 
> 2.26.2
>