Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates
 149.199.62.198 as permitted sender) receiver=protection.outlook.com;
 client-ip=149.199.62.198; helo=xsj-pvapexch02.xlnx.xilinx.com;
Envelope-to: git@xilinx.com,
 michal.simek@xilinx.com,
 rajan.vaja@xilinx.com,
 linux-arm-kernel@lists.infradead.org,
 devicetree@vger.kernel.org,
 robh+dt@kernel.org,
 krzk@kernel.org,
 monstr@monstr.eu,
 linux-kernel@vger.kernel.org,
 laurent.pinchart@ideasonboard.com
Subject: Re: [PATCH 06/12] arm64: dts: zynqmp: Add label for zynqmp_ipi
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Michal Simek <michal.simek@xilinx.com>
CC:     <linux-kernel@vger.kernel.org>, <monstr@monstr.eu>,
        <git@xilinx.com>, Kalyani Akula <kalyani.akula@xilinx.com>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Manish Narani <manish.narani@xilinx.com>,
        Rajan Vaja <rajan.vaja@xilinx.com>,
        Rob Herring <robh+dt@kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>
References: <cover.1606917949.git.michal.simek@xilinx.com>
 <272e23e0123f02c559bfa4ada9de73eb197aced8.1606917949.git.michal.simek@xilinx.com>
 <X81fXtxvsc7KE7cK@pendragon.ideasonboard.com>
 <X81forerb/QuXB2U@pendragon.ideasonboard.com>
From:   Michal Simek <michal.simek@xilinx.com>
Message-ID: <0c35fcf0-145e-b3a9-9af9-a5f60ede10c2@xilinx.com>
Date:   Mon, 7 Dec 2020 10:43:39 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.5.1
MIME-Version: 1.0
In-Reply-To: <X81forerb/QuXB2U@pendragon.ideasonboard.com>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2020 09:43:58.7358
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 4659a6d8-e9c2-4380-33ec-08d89a949f25
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch02.xlnx.xilinx.com]
X-MS-Exchange-CrossTenant-AuthSource: BL2NAM02FT009.eop-nam02.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR02MB2799
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


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@xilinx.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