linux-kernel - Re: [PATCH 1/1 v2] imx6q-wandboard-revb1.dts: use unique machine name

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Date:	Mon, 8 Feb 2016 01:25:15 +0100
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Robert Nelson <robertcnelson@...il.com>
Cc:	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	George Joseph <george.joseph@...rview5.com>,
	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>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Fabio Estevam <fabio.estevam@....co>
Subject: Re: [PATCH 1/1 v2] imx6q-wandboard-revb1.dts: use unique machine name



On 08.02.2016 00:52, Robert Nelson wrote:
> On Sat, Feb 6, 2016 at 6:06 AM, Heinrich Schuchardt <xypron.glpk@....de> wrote:
>> Downstream packages like Debian flash-kernel use
>> /proc/device-tree/model
>> to determine which dtb file to install.
>>
>> Hence each dts in the Linux kernel should provide a unique model identifier.
>>
>> https://lkml.org/lkml/2014/7/8/579 created the new file
>> imx6q-wandboard-revb1.dts but used the same model identifier
>> as in imx6q-wandboard.dts.
>>
>> This patch provides a unique model identifier for revision B1 of
>> the Wandboard Quad.
>>
>> v2:
>>         correct name of referenced Debian package
>>
>> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
>> ---
>>  arch/arm/boot/dts/imx6q-wandboard-revb1.dts | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/imx6q-wandboard-revb1.dts b/arch/arm/boot/dts/imx6q-wandboard-revb1.dts
>> index 20bf3c2..9207d80 100644
>> --- a/arch/arm/boot/dts/imx6q-wandboard-revb1.dts
>> +++ b/arch/arm/boot/dts/imx6q-wandboard-revb1.dts
>> @@ -13,7 +13,7 @@
>>  #include "imx6qdl-wandboard-revb1.dtsi"
>>
>>  / {
>> -       model = "Wandboard i.MX6 Quad Board";
>> +       model = "Wandboard i.MX6 Quad Board rev B1";
> 
> Okay, this seems a little silly....
> 
> The wandboard has 5 versions:
> 
> solo: imx6dl-wandboard-revb1.dts
> 
> model = "Wandboard i.MX6 Dual Lite Board";
> 
> dual rev b: imx6dl-wandboard-revb1.dts
> 
> model = "Wandboard i.MX6 Dual Lite Board";
> 
> dual rev c: imx6dl-wandboard.dts
> 
> model = "Wandboard i.MX6 Dual Lite Board";
> 
> quad rev b: imx6q-wandboard-revb1.dts
> model = "Wandboard i.MX6 Quad Board"; - > model = "Wandboard i.MX6
> Quad Board rev B1";
> 
> quad rev c: imx6q-wandboard.dts
> model = "Wandboard i.MX6 Quad Board";
> 
> 
> Do you guys see the issue?  Either we change them "ALL", rev b or rev c...
> 
> Or "flash-kernel" needs to learn to copy more then one dtb (in this
> case 5 *.dtb's)
> 
> PS, u-boot already can boot on all these with the same SPL/u-boot
> image and detect which board and load the correct device tree binary..
> 
> Regards,
> 
Hello Robert,

I only see four dts files mentioned in your mail (solo using the same as
dual rev B1).

We do not know if imx6dl-wandboard.dts and imx6q-wandboard.dts
will support future revisions of the boards. So it doesn't make
much sense to mark them as restricted to revision C1.

You are right in that we should add a change to
imx6dl-wandboard-revb1.dts to the same patch.

Best regards

Heinrich Schuchardt