[alsa-devel] [PATCH V2 4/5] ARM: dt: tegra30.dtsi: Add audio-related nodes

Stephen Warren swarren at wwwdotorg.org
Wed Apr 11 07:28:19 CEST 2012

On 04/10/2012 10:27 PM, Olof Johansson wrote:
> On Tue, Apr 10, 2012 at 4:19 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> From: Stephen Warren <swarren at nvidia.com>
>> Add nodes for the Tegra30 AHUB and I2S controllers.
>> diff --git a/arch/arm/boot/dts/tegra30.dtsi b/arch/arm/boot/dts/tegra30.dtsi
>> +       ahub at 70080000 {
> No need for unit address here since there's only one node with this
> name -- "ahub {"  is sufficient.

Is there actually a benefit from leaving it out though?

>> +               compatible = "nvidia,tegra30-ahub";
>> +               reg = <0x70080000 0x200 0x70080200 0x100>;
> Why not just use 0x70080000 0x300?

The register space is logically divided into two chunks; the first for
the DMA FIFOs and the second for the AHUB routing registers. Future
chips may change the relative positions and sizes of these two chunks,
hence I figured it was best to model them independently even though
they're contiguous in Tegra30.

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