linux-kernel - Re: [PATCH] arm64: tegra: Add missing Smaug revision

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Date:	Thu, 30 Jun 2016 15:04:22 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Jon Hunter <jonathanh@...dia.com>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Rhyland Klein <rklein@...dia.com>,
	Olof Johansson <olof@...om.net>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: tegra: Add missing Smaug revision

On Wed, Jun 29, 2016 at 6:02 PM, Jon Hunter <jonathanh@...dia.com> wrote:
>
> On 29/06/16 09:52, Alexandre Courbot wrote:
>> The "google,smaug-rev2" string is missing from the compatible list of
>> Smaug's DT. The differences of rev2 are not relevant at our current
>> level of support and it boots just fine, so add it.
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> ---
>>  arch/arm64/boot/dts/nvidia/tegra210-smaug.dts | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts b/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts
>> index 431266a48e9c..82a96bd27bc8 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts
>> +++ b/arch/arm64/boot/dts/nvidia/tegra210-smaug.dts
>> @@ -11,7 +11,8 @@
>>       compatible = "google,smaug-rev8", "google,smaug-rev7",
>>                    "google,smaug-rev6", "google,smaug-rev5",
>>                    "google,smaug-rev4", "google,smaug-rev3",
>> -                  "google,smaug-rev1", "google,smaug", "nvidia,tegra210";
>> +                  "google,smaug-rev2", "google,smaug-rev1",
>> +                  "google,smaug", "nvidia,tegra210";
>>
>>       aliases {
>>               serial0 = &uarta;
>
> Acked-by: Jon Hunter <jonathanh@...dia.com>
>
> Olof, let us know if you have any comments on this? Looks like I missed
> this initially because the rev2 support had been broken out in the
> chrome-os kernel tree to support some specific features for this board.
> However, I think for now it is ok to include rev2 here as well for mainline.

This should be perfectly safe. If I run a diff between
tegra210-smaug-p1.dts and tegra210-smaug-p2.dts in the ChromeOS tree,
the only node that differs is sysedp-batmon-calc. The other node in
these files (spiflash) is identical.

Besides I don't think there are that many rev2s out there. :)