linux-kernel - Re: [PATCH 1/4] ARM: tegra: rely on bootloader pinmux programming on nyan-big

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Date:	Wed, 7 Jan 2015 09:06:30 +0100
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] ARM: tegra: rely on bootloader pinmux programming on nyan-big

On 6 January 2015 at 18:09, Stephen Warren <swarren@...dotorg.org> wrote:
> On 01/06/2015 03:37 AM, Tomeu Vizoso wrote:
>>
>> Following 6dbaff2b, the kernel expects that the bootloader has correctly
>> programmed the Tegra pinmux.
>>
>> DTs for the Jetson and the Venice2 had been updated already but this one
>> was left behind.
>
>
> So this setup is true for NVIDIA-controlled development/reference boards
> where we've ensured that the bootloader sets up 100% of the pinmux.
>
> However, I know that Coreboot on this board doesn't set up everything in the
> pinmux, and since it's in r/o flash never will. As such, I'm not sure this
> change is safe for this board. That is, unless you want to force upstream
> kernels to be booted via a chain-loaded path: Coreboot (r/o) -> U-Boot (r/w
> with full pinmux setup) -> kernel.
>
>> Have tested this with the stock vendor firmware (coreboot) and have found
>> no
>> issues.
>
>
> There are presumably a bunch of features which aren't yet supported
> upstream, and hence you couldn't test though? That means we might find that
> parts of the pinmux aren't yet programmed but need to be to enable those
> features.

Sure, there's no chance that my testing could have been extensive enough.

Following Andrew's feedback, I will be looking at getting the pinmux
programming right in the DTs.

Thanks,

Tomeu

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