linux-kernel - Re: [Patch v2 2/2] dt/bindings: qcom

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Message-ID: <54AEAFB6.9050609@codeaurora.org>
Date:	Thu, 08 Jan 2015 11:26:30 -0500
From:	Christopher Covington <cov@...eaurora.org>
To:	Andy Gross <agross@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>
CC:	dmaengine@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	Archit Taneja <architt@...eaurora.org>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch v2 2/2] dt/bindings: qcom_adm: Fix channel specificers

Hi Andy,

On 01/07/2015 10:26 PM, Andy Gross wrote:
> This patch removes the crci information from the dma channel property.  At least
> one client device requires using more than one CRCI value for a channel.  This
> does not match the current binding and the crci information needs to be removed.
> 
> Instead, the client device will provide this information via other means.
> 
> Signed-off-by: Andy Gross <agross@...eaurora.org>
> ---
>  Documentation/devicetree/bindings/dma/qcom_adm.txt |   14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/qcom_adm.txt b/Documentation/devicetree/bindings/dma/qcom_adm.txt
> index 9bcab91..fba67c6 100644
> --- a/Documentation/devicetree/bindings/dma/qcom_adm.txt
> +++ b/Documentation/devicetree/bindings/dma/qcom_adm.txt
> @@ -4,8 +4,7 @@ Required properties:
>  - compatible: must contain "qcom,adm" for IPQ/APQ8064 and MSM8960
>  - reg: Address range for DMA registers
>  - interrupts: Should contain one interrupt shared by all channels
> -- #dma-cells: must be <2>.  First cell denotes the channel number.  Second cell
> -  denotes CRCI (client rate control interface) flow control assignment.
> +- #dma-cells: must be <1>.  First cell denotes the channel number.
>  - clocks: Should contain the core clock and interface clock.
>  - clock-names: Must contain "core" for the core clock and "iface" for the
>    interface clock.
> @@ -22,7 +21,7 @@ Example:
>  			compatible = "qcom,adm";
>  			reg = <0x18300000 0x100000>;
>  			interrupts = <0 170 0>;
> -			#dma-cells = <2>;
> +			#dma-cells = <1>;
>  
>  			clocks = <&gcc ADM0_CLK>, <&gcc ADM0_PBUS_CLK>;
>  			clock-names = "core", "iface";
> @@ -35,15 +34,12 @@ Example:
>  			qcom,ee = <0>;
>  		};
>  
> -DMA clients must use the format descripted in the dma.txt file, using a three
> +DMA clients must use the format descripted in the dma.txt file, using a two
>  cell specifier for each channel.
>  
>  Each dmas request consists of 3 cells:

Now 2 cells?

>   1. phandle pointing to the DMA controller
>   2. channel number
> - 3. CRCI assignment, if applicable.  If no CRCI flow control is required, use 0.
> -    The CRCI is used for flow control.  It identifies the peripheral device that
> -    is the source/destination for the transferred data.
>  
>  Example:
>  
> @@ -56,7 +52,7 @@ Example:
>  
>  		cs-gpios = <&qcom_pinmux 20 0>;
>  
> -		dmas = <&adm_dma 6 9>,
> -			<&adm_dma 5 10>;
> +		dmas = <&adm_dma 6>,
> +			<&adm_dma 5>;
>  		dma-names = "rx", "tx";
>  	};
> 

Chris

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Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
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