linux-kernel - Re: [PATCH v2 1/3] devicetree: bindings: Document qcom,msm-id and qcom,board-id

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Date:	Tue, 10 Mar 2015 13:10:08 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Olof Johansson <olof@...om.net>
Cc:	Arnd Bergmann <arnd@...db.de>, Kevin Hilman <khilman@...nel.org>,
	linux-arm-msm <linux-arm-msm@...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>,
	"arm@...nel.org" <arm@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Heiko Stübner <heiko@...ech.de>
Subject: Re: [PATCH v2 1/3] devicetree: bindings: Document qcom,msm-id and qcom,board-id

>>>>>>>>> The top level qcom,msm-id and qcom,board-id are utilized by bootloaders
>>>>>>>>>> on Qualcomm MSM platforms to determine which device tree should be
>>>>>>>>>> utilized and passed to the kernel.
>>>>>>>>>> 
>>>>>>>>>> Cc: <devicetree@...r.kernel.org>
>>>>>>>>>> Signed-off-by: Kumar Gala <galak@...eaurora.org>
>>>>>>>>> 
>>>>>>>>> Is this the special magic that allows qcom bootloaders to take a kernel
>>>>>>>>> plus multiple DTBs and figure out which DTB to pass?
>>>>>>>>> 
>>>>>>>>> Kevin
>>>>>>>> 
>>>>>>>> yes
>>>>>>> 
>>>>>>> That's a bummer.
>>>>>>> 
>>>>>>> Luckily, the solution for upstream is still quite simple: Provide only
>>>>>>> one devicetree, and it'll be used, right?
>>>>>> 
>>>>>> We can provide only one, we still need the IDs in the DT.
>>>>> 
>>>>> How are the DTS provided? Concatenated with the kernel, or in a
>>>>> wrapped data format? Or in a separate partition from the kernel?
>>>> 
>>>> Its a wrapped data format that is than concatenated with the kernel if I remember correctly.
>>> 
>>> Then you should be able to create a tool that can write this concatenated
>>> format and insert these properties from a table that matches the boot
>>> loader, right?
>>> 
>>>      Arnd
>> 
>> Are you suggesting the tool insert the properties in the DT?  I’m not sure I understand what the point of doing that would be.
> 
> To insert platform-local properties that mean nothing outside of the
> firmware packaging of the device trees, which is the case here?
> 
> I think the idea of having the installer script inserting them is
> quite reasonable in this case.
> 
> 
> -Olof

These values are static, so not sure what the point of having the installer script do that?

- k

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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