Re: [PATCH 2/5] ARM: tegra: dts: add slink controller dt entry

From: Laxman Dewangan
Date: Fri Oct 19 2012 - 05:11:12 EST

On Friday 19 October 2012 04:11 AM, Stephen Warren wrote:
On 10/18/2012 04:56 AM, Laxman Dewangan wrote:
Add slink controller details in the dts file of
Tegra20 and Tegra30.
diff --git a/arch/arm/boot/dts/tegra20.dtsi b/arch/arm/boot/dts/tegra20.dtsi
+ slink@7000d400 {
+ compatible = "nvidia,tegra20-slink";
+ reg =<0x7000d400 0x200>;
+ interrupts =<0 59 0x04>;
+ nvidia,dma-req-sel =<15>;
I thought the common DT DMA bindings were going to be in 3.7, and hence
we could just use them here rather than inventing another custom
property for this purpose?
Adding Vinod here.

I looked the dma devicetree bingind document and did not found the generic binding name. Howvere, for arm-pl330.txt, it is explained as

pdma0: pdma@12680000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0x12680000 0x1000>;
interrupts = <99>;

Client drivers (device nodes requiring dma transfers from dev-to-mem or
mem-to-dev) should specify the DMA channel numbers using a two-value pair
as shown below.

[property name] = <[phandle of the dma controller] [dma request id]>;

where 'dma request id' is the dma request number which is connected
to the client controller. The 'property name' is recommended to be
of the form <name>-dma-channel.

Example: tx-dma-channel = <&pdma0 12>;

So here I can also add the name like same.

Do you see any issue in follow the above mechanism for Tegra dma client driver?


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