linux-kernel - Re: [PATCH 2/2] dmaengine: msm_bam

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Message-Id: <20131025232015.9082FC403B6@trevor.secretlab.ca>
Date:	Sat, 26 Oct 2013 00:20:15 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Andy Gross <agross@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	David Brown <davidb@...eaurora.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>
Subject: Re: [PATCH 2/2] dmaengine: msm_bam_dma: Add device tree binding

On Fri, 25 Oct 2013 15:24:03 -0500, Andy Gross <agross@...eaurora.org> wrote:
> Add device tree probe support for the MSM BAM DMA driver.
> 
> Signed-off-by: Andy Gross <agross@...eaurora.org>
> ---
>  .../devicetree/bindings/dma/msm_bam_dma.txt        |   49 ++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/msm_bam_dma.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/msm_bam_dma.txt b/Documentation/devicetree/bindings/dma/msm_bam_dma.txt
> new file mode 100644
> index 0000000..fe3ed8f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/msm_bam_dma.txt
> @@ -0,0 +1,49 @@
> +MSM BAM DMA controller
> +
> +Required properties:
> +- compatible: Should be "qcom,bam"

Really should be more specific than this. "qcom,bam" doesn't clarify
what SoC this hardware is implemented on.

Otherwise the binding looks fine.

g.

> +- reg: Address range for DMA registers
> +- interrupts: single interrupt for this controller
> +- #dma-cells: must be <3>
> +- clocks: required clock
> +- clock-names: name of clock
> +
> +Example:
> +
> +	dma0: dma@...84000 = {
> +		compatible = "qcom,bam";
> +		reg = <0xf9984000 0x15000>;
> +		interrupts = <0 94 0>;
> +		clocks = <&bam_dma_ahb_cxc>;
> +		clock-names = "bam_clk";
> +		#dma-cells = <3>;
> +	};
> +
> +Client:
> +Required properties:
> +- dmas: List of dma channel requests
> +- dma-names: Names of aforementioned requested channels
> +
> +Clients must use the format described in the dma.txt file, using a four cell
> +specifier for each channel.
> +
> +The four cells in order are:
> +  1. A phandle pointing to the DMA controller
> +  2. The channel number
> +  3. The execution environment value for this channel.
> +  4. Direction of the fixed unidirectional channel
> +     0 - Memory to Device
> +     1 - Device to Memory
> +
> +Example:
> +	serial@...1e000 {
> +		compatible = "qcom,msm-uart";
> +		reg = <0xf991e000 0x1000>
> +			<0xf9944000 0x19000>;
> +		interrupts = <0 108 0>;
> +		clocks = <&blsp1_uart2_apps_cxc>, <&blsp1_ahb_cxc>;
> +		clock-names = "gsbi_uart_clk", "gsbi_pclk";
> +
> +		dmas = <&dma0 0 0 1>, <&dma0 1 0 0>;
> +		dma-names = "rx", "tx";
> +	};
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 
> --
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