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Date: Thu, 29 Apr 2021 15:38:45 -0500
From: Rob Herring <robh+dt@...nel.org>
To: Corentin Labbe <clabbe@...libre.com>
Cc: Vinod <vkoul@...nel.org>, devicetree@...r.kernel.org,
"open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM"
<dmaengine@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] dt-bindings: dma: convert arm-pl08x to yaml
On Thu, Apr 29, 2021 at 2:25 PM Corentin Labbe <clabbe@...libre.com> wrote:
>
> Converts dma/arm-pl08x.txt to yaml.
> In the process, I add an example for the faraday variant.
>
> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> ---
> Changes since v1:
> - fixes yamllint warning about indent
> - added select
> - fixed example (needed includes)
>
> .../devicetree/bindings/dma/arm-pl08x.txt | 59 --------
> .../devicetree/bindings/dma/arm-pl08x.yaml | 141 ++++++++++++++++++
> 2 files changed, 141 insertions(+), 59 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/dma/arm-pl08x.txt
> create mode 100644 Documentation/devicetree/bindings/dma/arm-pl08x.yaml
> diff --git a/Documentation/devicetree/bindings/dma/arm-pl08x.yaml b/Documentation/devicetree/bindings/dma/arm-pl08x.yaml
> new file mode 100644
> index 000000000000..06dec6f3e9a8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/arm-pl08x.yaml
> @@ -0,0 +1,141 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/arm-pl08x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ARM PrimeCells PL080 and PL081 and derivatives DMA controller
> +
> +maintainers:
> + - Vinod Koul <vkoul@...nel.org>
> +
> +allOf:
> + - $ref: "dma-controller.yaml#"
> +
> +# We need a select here so we don't match all nodes with 'arm,primecell'
> +select:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - arm,pl080
> + - arm,pl081
> + required:
> + - compatible
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - const: "arm,pl080"
> + - const: "arm,primecell"
> + - items:
> + - const: "arm,pl081"
> + - const: "arm,primecell"
The first 2 oneOf entries can be combined into one.
And you don't need quotes.
> + - items:
> + - const: faraday,ftdma020
> + - const: arm,pl080
> + - const: arm,primecell
blank line between each DT property
> + arm,primecell-periphid:
> + $ref: /schemas/types.yaml#/definitions/uint32
This already has a type in the common definition, so drop.
> + description: on the FTDMAC020 the primecell ID is not hard-coded
> + in the hardware and must be specified here as <0x0003b080>. This number
> + follows the PrimeCell standard numbering using the JEP106 vendor code 0x38
> + for Faraday Technology.
> + reg:
> + minItems: 1
Convention is 'maxItems: 1'.
> + description: Address range of the PL08x registers
> + interrupts:
> + minItems: 1
> + description: The PL08x interrupt number
> + clocks:
> + minItems: 1
> + description: The clock running the IP core clock
> + clock-names:
> + const: "apb_pclk"
primecell.yaml already covers this IIRC. Just 'maxItems: 1' is fine here.
> + lli-bus-interface-ahb1:
> + type: boolean
> + description: if AHB master 1 is eligible for fetching LLIs
> + lli-bus-interface-ahb2:
> + type: boolean
> + description: if AHB master 2 is eligible for fetching LLIs
> + mem-bus-interface-ahb1:
> + type: boolean
> + description: if AHB master 1 is eligible for fetching memory contents
> + mem-bus-interface-ahb2:
> + type: boolean
> + description: if AHB master 2 is eligible for fetching memory contents
> + "#dma-cells":
> + const: 2
> + description: must be <2>. First cell should contain the DMA request,
'must be <2>' is already stated by the schema.
> + second cell should contain either 1 or 2 depending on
> + which AHB master that is used.
> +
> + memcpy-burst-size:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum:
> + - 1
> + - 4
> + - 8
> + - 16
> + - 32
> + - 64
> + - 128
> + - 256
> + description: the size of the bursts for memcpy
> + memcpy-bus-width:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum:
> + - 8
> + - 16
> + - 32
> + - 64
> + description: |
Don't need '|' unless you need to preserve formatting.
> + the bus width used for memcpy in bits: 8, 16 or 32 are legal
> + values, the Faraday FTDMAC020 can also accept 64 bits
> +
> +required:
> + - reg
> + - interrupts
> + - clocks
> + - clock-names
> + - "#dma-cells"
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + dmac0: dma-controller@...30000 {
> + compatible = "arm,pl080", "arm,primecell";
> + reg = <0x10130000 0x1000>;
> + interrupt-parent = <&vica>;
> + interrupts = <15>;
> + clocks = <&hclkdma0>;
> + clock-names = "apb_pclk";
> + lli-bus-interface-ahb1;
> + lli-bus-interface-ahb2;
> + mem-bus-interface-ahb2;
> + memcpy-burst-size = <256>;
> + memcpy-bus-width = <32>;
> + #dma-cells = <2>;
> + };
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> + #include <dt-bindings/reset/cortina,gemini-reset.h>
> + #include <dt-bindings/clock/cortina,gemini-clock.h>
> + dma-controller@...00000 {
> + compatible = "faraday,ftdma020", "arm,pl080", "arm,primecell";
> + /* Faraday Technology FTDMAC020 variant */
> + arm,primecell-periphid = <0x0003b080>;
> + reg = <0x67000000 0x1000>;
> + interrupts = <9 IRQ_TYPE_EDGE_RISING>;
> + resets = <&syscon GEMINI_RESET_DMAC>;
> + clocks = <&syscon GEMINI_CLK_AHB>;
> + clock-names = "apb_pclk";
> + /* Bus interface AHB1 (AHB0) is totally tilted */
> + lli-bus-interface-ahb2;
> + mem-bus-interface-ahb2;
> + memcpy-burst-size = <256>;
> + memcpy-bus-width = <32>;
> + #dma-cells = <2>;
> + };
> --
> 2.26.3
>
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