linux-kernel - Re: [PATCH v7 3/3] Documentation: dma: Add APM X-Gene SoC DMA engine driver documentation

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Date:	Mon, 16 Mar 2015 16:01:01 +0530
From:	Rameshwar Sahu <rsahu@....com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	dan.j.williams@...el.com, dmaengine@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	ddutile@...hat.com, jcm@...hat.com, patches@....com,
	Loc Ho <lho@....com>
Subject: Re: [PATCH v7 3/3] Documentation: dma: Add APM X-Gene SoC DMA engine
 driver documentation

Hi Vinod,

On Mon, Mar 16, 2015 at 2:59 PM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Thu, Mar 12, 2015 at 04:45:21PM +0530, Rameshwar Prasad Sahu wrote:
>> This patch adds device tree binding for APM X-Gene SoC DMA engine driver.
> The patch title should be to add the bindings and not Documentation

Got it, thanks
>
> --
> ~Vinod
>>
>> Signed-off-by: Rameshwar Prasad Sahu <rsahu@....com>
>> Signed-off-by: Loc Ho <lho@....com>
>> ---
>>  .../devicetree/bindings/dma/apm-xgene-dma.txt      | 47 ++++++++++++++++++++++
>>  1 file changed, 47 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
>>
>> diff --git a/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt b/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
>> new file mode 100644
>> index 0000000..d305876
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
>> @@ -0,0 +1,47 @@
>> +Applied Micro X-Gene SoC DMA nodes
>> +
>> +DMA nodes are defined to describe on-chip DMA interfaces in
>> +APM X-Gene SoC.
>> +
>> +Required properties for DMA interfaces:
>> +- compatible: Should be "apm,xgene-dma".
>> +- device_type: set to "dma".
>> +- reg: Address and length of the register set for the device.
>> +  It contains the information of registers in the following order:
>> +  1st - DMA control and status register address space.
>> +  2nd - Descriptor ring control and status register address space.
>> +  3rd - Descriptor ring command register address space.
>> +  4th - Soc efuse register address space.
>> +- interrupts: DMA has 5 interrupts sources. 1st interrupt is
>> +  DMA error reporting interrupt. 2nd, 3rd, 4th and 5th interrupts
>> +  are completion interrupts for each DMA channels.
>> +- clocks: Reference to the clock entry.
>> +
>> +Optional properties:
>> +- dma-coherent : Present if dma operations are coherent
>> +
>> +Example:
>> +     dmaclk: dmaclk@...7c000 {
>> +             compatible = "apm,xgene-device-clock";
>> +             #clock-cells = <1>;
>> +             clocks = <&socplldiv2 0>;
>> +             reg = <0x0 0x1f27c000 0x0 0x1000>;
>> +             reg-names = "csr-reg";
>> +             clock-output-names = "dmaclk";
>> +     };
>> +
>> +     dma: dma@...70000 {
>> +                     compatible = "apm,xgene-storm-dma";
>> +                     device_type = "dma";
>> +                     reg = <0x0 0x1f270000 0x0 0x10000>,
>> +                           <0x0 0x1f200000 0x0 0x10000>,
>> +                           <0x0 0x1b008000 0x0 0x2000>,
>> +                           <0x0 0x1054a000 0x0 0x100>;
>> +                     interrupts = <0x0 0x82 0x4>,
>> +                                  <0x0 0xb8 0x4>,
>> +                                  <0x0 0xb9 0x4>,
>> +                                  <0x0 0xba 0x4>,
>> +                                  <0x0 0xbb 0x4>;
>> +                     dma-coherent;
>> +                     clocks = <&dmaclk 0>;
>> +     };
>> --
>> 1.8.2.1
>>
>
> --
--
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