06006ad29a
Add dma-channels property, then we can determine how many channels there by device tree, rather than statically defining it in PDMA driver. In addition, we also modify the compatible for PDMA versioning scheme. Signed-off-by: Zong Li <zong.li@sifive.com> Reviewed-by: Rob Herring <robh@kernel.org> Suggested-by: Palmer Dabbelt <palmer@rivosinc.com> Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Link: https://lore.kernel.org/r/7cc9a7b5f7e6c28fc9eb172c441b5aed2159b8a0.1648461096.git.zong.li@sifive.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
75 lines
1.7 KiB
YAML
75 lines
1.7 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/dma/sifive,fu540-c000-pdma.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: SiFive Unleashed Rev C000 Platform DMA
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maintainers:
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- Green Wan <green.wan@sifive.com>
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- Palmer Debbelt <palmer@sifive.com>
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- Paul Walmsley <paul.walmsley@sifive.com>
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description: |
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Platform DMA is a DMA engine of SiFive Unleashed. It supports 4
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channels. Each channel has 2 interrupts. One is for DMA done and
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the other is for DME error.
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In different SoC, DMA could be attached to different IRQ line.
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DT file need to be changed to meet the difference. For technical
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doc,
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https://static.dev.sifive.com/FU540-C000-v1.0.pdf
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allOf:
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- $ref: "dma-controller.yaml#"
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properties:
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compatible:
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items:
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- enum:
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- sifive,fu540-c000-pdma
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- const: sifive,pdma0
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description:
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Should be "sifive,<chip>-pdma" and "sifive,pdma<version>".
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Supported compatible strings are -
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"sifive,fu540-c000-pdma" for the SiFive PDMA v0 as integrated onto the
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SiFive FU540 chip resp and "sifive,pdma0" for the SiFive PDMA v0 IP block
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with no chip integration tweaks.
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reg:
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maxItems: 1
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interrupts:
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minItems: 1
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maxItems: 8
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dma-channels:
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description: For backwards-compatibility, the default value is 4
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minimum: 1
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maximum: 4
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default: 4
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'#dma-cells':
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const: 1
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required:
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- compatible
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- reg
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- interrupts
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unevaluatedProperties: false
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examples:
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- |
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dma-controller@3000000 {
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compatible = "sifive,fu540-c000-pdma", "sifive,pdma0";
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reg = <0x3000000 0x8000>;
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dma-channels = <4>;
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interrupts = <23>, <24>, <25>, <26>, <27>, <28>, <29>, <30>;
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#dma-cells = <1>;
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};
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...
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