linux-kernel - Re: [PATCH 1/5] ARM: DT: tegra114: add APB DMA controller DT entry

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Message-ID: <513A250C.1000202@wwwdotorg.org>
Date:	Fri, 08 Mar 2013 10:51:08 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, pdeschrijver@...dia.com
Subject: Re: [PATCH 1/5] ARM: DT: tegra114: add APB DMA controller DT entry

On 03/08/2013 06:52 AM, Laxman Dewangan wrote:
> NVIDIA's Tegra114 has 32 channels APB DMA controller. Add DT entry for
> APB DMA controllers and make it compatible with "nvidia,tegra114-apbdma".

> diff --git a/arch/arm/boot/dts/tegra114.dtsi b/arch/arm/boot/dts/tegra114.dtsi

> +	apbdma: dma {
> +		compatible = "nvidia,tegra114-apbdma";

So I know that the Tegra114 HW has a new channel-pause feature, which
the driver /can/ use. However, if the driver didn't know about that
feature, and continued to use the global-pause feature, would it still
work fine?

In other words, is the Tegra114 HW 100% backwards-compatible with the
Tegra30 HW, it's just that there are new features that SW could
optionally use?

If that is true, then we should also include "nvidia,tegra30-apbdma" in
the compatible value.
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