linux-kernel - Re: [PATCH 06/12] arm64: dts: zynqmp: Add label for zynqmp

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Date:   Mon, 7 Dec 2020 10:43:39 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Michal Simek <michal.simek@...inx.com>
CC:     <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
        <git@...inx.com>, Kalyani Akula <kalyani.akula@...inx.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Manish Narani <manish.narani@...inx.com>,
        Rajan Vaja <rajan.vaja@...inx.com>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 06/12] arm64: dts: zynqmp: Add label for zynqmp_ipi



On 06. 12. 20 23:48, Laurent Pinchart wrote:
> On Mon, Dec 07, 2020 at 12:46:56AM +0200, Laurent Pinchart wrote:
>> Hi Michal,
>>
>> Thank you for the patch.
>>
>> On Wed, Dec 02, 2020 at 03:06:05PM +0100, Michal Simek wrote:
>>> Add label which is used by bootloader for adding bootloader specific flag.
>>>
>>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>>> ---
>>>
>>> U-Boot needs to add u-boot,dm-pre-reloc; property
>>
>> I'm not entirely sure what best practice rules are in this area, but
>> shouldn't U-Boot locate the node by name instead of label ?
> 
> And regardless of what mechanism is used, it should be documented in the
> bindings.

I don't think we should be documenting labels because names can be
whatever. DT binding spec is just talking about name rules.

6.2 chapter.

A label shall be between - 1 to 31 characters in length, be composed
only of the characters in the set Table 6.1, and must not start with a
number.

- Table 6.1: Valid characters for DTS labels
Character	Description
0-9		digit
a-z		lowercase letter
A-Z		uppercase letter
_		underscore

Thanks,
Michal