linux-kernel - Re: [PATCH 1/2] dt-bindings: milbeaut-m10v-hdmac: Add Socionext Milbeaut HDMAC bindings

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Date:   Tue, 9 Jul 2019 08:34:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     jassisinghbrar@...il.com
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, vkoul@...nel.org,
        mark.rutland@....com, orito.takao@...ionext.com,
        masami.hiramatsu@...aro.org, kasai.kazuhiro@...ionext.com,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH 1/2] dt-bindings: milbeaut-m10v-hdmac: Add Socionext
 Milbeaut HDMAC bindings

On Wed, Jun 12, 2019 at 07:52:37PM -0500, jassisinghbrar@...il.com wrote:
> From: Jassi Brar <jaswinder.singh@...aro.org>
> 
> Document the devicetree bindings for Socionext Milbeaut HDMAC
> controller. Controller has upto 8 floating channels, that need
> a predefined slave-id to work from a set of slaves.
> 
> Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
> ---
>  .../bindings/dma/milbeaut-m10v-hdmac.txt           | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/milbeaut-m10v-hdmac.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/milbeaut-m10v-hdmac.txt b/Documentation/devicetree/bindings/dma/milbeaut-m10v-hdmac.txt
> new file mode 100644
> index 000000000000..a104fcb9e73d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/milbeaut-m10v-hdmac.txt
> @@ -0,0 +1,51 @@
> +* Milbeaut AHB DMA Controller
> +
> +Milbeaut AHB DMA controller has transfer capability bellow.
> + - memory to memory transfer
> + - device to memory transfer
> + - memory to device transfer
> +
> +Required property:
> +- compatible:       Should be  "socionext,milbeaut-m10v-hdmac"
> +- reg:              Should contain DMA registers location and length.
> +- interrupts:       Should contain all of the per-channel DMA interrupts.

How many?

> +- #dma-cells:       Should be 1. Specify the ID of the slave.
> +- clocks:           Phandle to the clock used by the HDMAC module.
> +
> +
> +Example:
> +
> +	hdmac1: hdmac@...10000 {

dma-controller@...

> +		compatible = "socionext,milbeaut-m10v-hdmac";
> +		reg = <0x1e110000 0x10000>;
> +		interrupts = <0 132 4>,
> +			     <0 133 4>,
> +			     <0 134 4>,
> +			     <0 135 4>,
> +			     <0 136 4>,
> +			     <0 137 4>,
> +			     <0 138 4>,
> +			     <0 139 4>;
> +		#dma-cells = <1>;
> +		clocks = <&dummy_clk>;
> +	};
> +
> +* DMA client
> +
> +Clients have to specify the DMA requests with phandles in a list.

Nothing specific to this binding here and the client side is already 
documented, so drop this section.

> +
> +Required properties:
> +- dmas:             List of one or more DMA request specifiers. One DMA request specifier
> +                    consists of a phandle to the DMA controller followed by the integer
> +                    specifying the request line.
> +- dma-names:        List of string identifiers for the DMA requests. For the correct
> +                    names, have a look at the specific client driver.
> +
> +Example:
> +
> +	sni_spi1: spi@...00100 {
> +		...
> +		dmas = <&hdmac1 22>, <&hdmac1 21>;
> +		dma-names = "tx", "rx";
> +		...
> +	};
> -- 
> 2.17.1
>