linux-kernel - Re: [PATCH v3 1/3] dt-bindings: dmaengine: Add MediaTek High-Speed DMA controller bindings

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Date:   Mon, 5 Feb 2018 00:09:10 -0600
From:   Rob Herring <robh@...nel.org>
To:     sean.wang@...iatek.com
Cc:     vinod.koul@...el.com, dan.j.williams@...el.com,
        mark.rutland@....com, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: dmaengine: Add MediaTek High-Speed
 DMA controller bindings

On Thu, Feb 01, 2018 at 11:45:23AM +0800, sean.wang@...iatek.com wrote:
> From: Sean Wang <sean.wang@...iatek.com>
> 
> Document the devicetree bindings for MediaTek High-Speed DMA controller
> which could be found on MT7623 SoC or other similar Mediatek SoCs.
> 
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> ---
>  .../devicetree/bindings/dma/mtk-hsdma.txt          | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/mtk-hsdma.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/mtk-hsdma.txt b/Documentation/devicetree/bindings/dma/mtk-hsdma.txt
> new file mode 100644
> index 0000000..c07c03e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/mtk-hsdma.txt
> @@ -0,0 +1,33 @@
> +MediaTek High-Speed DMA Controller
> +==================================
> +
> +This driver follows the generic DMA bindings defined in dma/dma.txt.

Bindings describe h/w, not drivers.

> +
> +Required properties:
> +
> +- compatible:	Must be one of
> +		  "mediatek,mt7622-hsdma": for MT7622 SoC
> +		  "mediatek,mt7623-hsdma": for MT7623 SoC
> +- reg:		Should contain the register's base address and length.
> +- interrupts:	Should contain a reference to the interrupt used by this
> +		device.
> +- clocks:	Should be the clock specifiers corresponding to the entry in
> +		clock-names property.
> +- clock-names:	Should contain "hsdma" entries.
> +- power-domains: Phandle to the power domain that the device is part of
> +- #dma-cells: 	The length of the DMA specifier, must be <1>. This one cell
> +		in dmas property of a client device represents the channel
> +		number.
> +Example:
> +
> +        hsdma: hsdma@...07000 {

dma-controller@...

> +		compatible = "mediatek,mt7623-hsdma";
> +		reg = <0 0x1b007000 0 0x1000>;
> +		interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_LOW>;
> +		clocks = <&ethsys CLK_ETHSYS_HSDMA>;
> +		clock-names = "hsdma";
> +		power-domains = <&scpsys MT2701_POWER_DOMAIN_ETH>;
> +		#dma-cells = <1>;
> +	};
> +
> +DMA clients must use the format described in dma/dma.txt file.
> -- 
> 2.7.4
>