linux-kernel - Re: [PATCH 4/5] ARM: tegra: Add host1x, dc and hdmi to Tegra114 device tree

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Date:	Wed, 28 Aug 2013 15:18:15 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Mikko Perttunen <mperttunen@...dia.com>
Cc:	Terje Bergstrom <tbergstrom@...dia.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] ARM: tegra: Add host1x, dc and hdmi to Tegra114
 device tree

On Wed, Aug 28, 2013 at 03:41:35PM +0300, Mikko Perttunen wrote:
> On 08/28/2013 03:25 PM, Thierry Reding wrote:
[...]
> >>Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> >>---
> >>  arch/arm/boot/dts/tegra114.dtsi | 43 +++++++++++++++++++++++++++++++++++++++++
> >>  1 file changed, 43 insertions(+)
> >>
> >>diff --git a/arch/arm/boot/dts/tegra114.dtsi b/arch/arm/boot/dts/tegra114.dtsi
> >>index 2905145..ce5a95c 100644
> >>--- a/arch/arm/boot/dts/tegra114.dtsi
> >>+++ b/arch/arm/boot/dts/tegra114.dtsi
> >>@@ -27,6 +27,49 @@
> >>  			(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> >>  	};
> >>
> >>+	host1x {
> >>+		compatible = "nvidia,tegra114-host1x", "nvidia,tegra30-host1x",
> >
> >I don't think that's correct. The Tegra114 host1x is not backwards
> >compatible with the Tegra30 host1x.
> >
> >That said, I have a local patch that is a bit more complete in that it
> >adds other host1x devices as listed in the TRM as well. But I'll leave
> >it up to Stephen how he prefers to handle that. It should be fine to
> >defer adding nodes for additional hardware blocks when the supporting
> >drivers are merged. We've done it for other devices as well.
> 
> Ok. Will need to add tegra114-host1x to the host1x driver compat
> strings, then, but I guess that's better than having it wrong in the
> DT.

I think that's not all. I have local patches that also introduce a v2 of
host1x, because the number of syncpoints is different. There may also be
other differences, but Terje might be more qualified to answer that.

> >>+		hdmi {
> >>+			compatible = "nvidia,tegra114-hdmi";
> >>+			reg = <0x54280000 0x00040000>;
> >>+			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
> >>+			clocks = <&tegra_car TEGRA114_CLK_HDMI>,
> >>+				    <&tegra_car TEGRA114_CLK_PLL_D_OUT0>;
> >
> >Any reason why we can't use pll_d2_out0 here, like we do on Tegra30?
> 
> I have this set to PLL_D because I don't have panel support so disp1
> will be the HDMI DC. However, it doesn't seem to matter which one is
> specified here. I have also tested HDMI with disp2 and that works
> too.

Well eventually we'll add panel support and I think it'd be good to stay
consistent as to what clocks are used for the internal and external
displays.

Thierry

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