linux-kernel - Re: [PATCH] arm/dt: tegra devicetree support

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Message-ID: <20110720224910.GI6999@S2100-06.ap.freescale.net>
Date:	Thu, 21 Jul 2011 06:49:11 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Stephen Warren <swarren@...dia.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Erik Gilling <konkers@...roid.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] arm/dt: tegra devicetree support

On Wed, Jul 20, 2011 at 08:37:19AM -0700, Stephen Warren wrote:
> Grant Likely wrote at Tuesday, July 19, 2011 5:43 PM:
> > Everything required to populate NVIDIA Tegra devices from the device
> > tree.  This patch adds a new DT_MACHINE_DESC() which matches against
> > a tegra20 device tree.  So far it only registers the on-chip devices,
> > but it will be refined in follow on patches to configure clocks and
> > pin IO from the device tree also.
> > 
> > Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
> > ---
> > 
> > Hi all,
> > 
> > Similar to the versatile patch I just posted, this is certainly not
> > complete board support, but it is enough to be useful.  I'd like to
> > merge this for v3.1.  It should not break any existing board support.
> 
> > diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
> 
> tegra-*.dts don't include status="disable" for all the unused controllers.
> Should that be added?
> 
> > +	sound {
> > +		compatible = "nvidia,harmony-sound", "nvidia,tegra-wm8903";
> 
> I thought the sound bindings were still somewhat experimental and not
> completely agreed upon. One issue I see is that Device Tree is
> supposed to represent pure HW, rather than driver-required abstractions,
> and at least the compatible name here is pretty Linux-driver-specific.
> 
> I think there are some devices missing from the DT file for audio too,
> e.g. the ALSA "PCM" (DMA) driver.
> 
> Also, the bindings for this aren't documented IIRC.
> 
> I'd suggest dropping the audio part of the DT file until the audio side
> is more mature.
> 
> > +		spkr-en-gpios = <&codec 2 0>;
> 
> Should that be "gpio" not "gpios", since there is only one?
> 
My reason for using "gpios" over "gpio" is that
Documentation/devicetree/bindings/gpio/gpio.txt says so.  Unless you
want to change the document to elaborate the difference between "gpio"
and "gpios", which I do not see the necessity ...

GPIO properties should be named "[<name>-]gpios".

Regards,
Shawn

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