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Received: from BYAPR12MB4758.namprd12.prod.outlook.com (2603:10b6:a03:a5::28) by DM6PR12MB4466.namprd12.prod.outlook.com (2603:10b6:5:2ae::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7025.18; Wed, 22 Nov 2023 08:49:57 +0000 Received: from BYAPR12MB4758.namprd12.prod.outlook.com ([fe80::39a2:42da:ea20:3349]) by BYAPR12MB4758.namprd12.prod.outlook.com ([fe80::39a2:42da:ea20:3349%5]) with mapi id 15.20.7002.028; Wed, 22 Nov 2023 08:49:57 +0000 Message-ID: Date: Wed, 22 Nov 2023 09:49:34 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] docs: dt-bindings: add DTS Coding Style document Content-Language: en-US To: Dragan Simic , Krzysztof Kozlowski Cc: wens@kernel.org, =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Andrew Davis , Arnd Bergmann , Bjorn Andersson , Geert Uytterhoeven , Heiko Stuebner , Konrad Dybcio , Neil Armstrong , Nishanth Menon , Olof Johansson , linux-rockchip@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-msm@vger.kernel.org References: <20231120084044.23838-1-krzysztof.kozlowski@linaro.org> <6b288a2e-d147-4bd3-b1d4-daf56295d939@gmail.com> <01f9ce3b-e6e5-4b05-bf7f-0b3a5f74910a@linaro.org> <7232a48b-b9ad-44b5-ae6a-d12dad70b3c4@linaro.org> <58a9caacc1226c7c3a2bdfe73ef1791f@manjaro.org> From: Michal Simek Autocrypt: addr=michal.simek@amd.com; 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Standard/common properties (defined by common bindings, e.g. without >>>>>> +   vendor-prefixes) >>>>>> +5. Vendor-specific properties >>>>>> +6. status (if applicable) >>>>>> +7. Child nodes, where each node is preceded with a blank line >>>>>> + >>>>>> +The "status" property is by default "okay", thus it can be omitted. >>>>> >>>>> I think it would really help to include position of #address-cells and >>>>> #size-cells here. In some files I saw them above "compatible" that seems >>>>> unintuitive. Some prefer putting them at end which I think makes sense >>>>> as they affect children nodes. >>>>> >>>>> Whatever you choose it'd be just nice to have things consistent. >>>> >>>> This is a standard/common property, thus it goes to (4) above. >>> >>> It's probably a mix, but AFAIK a lot of the device trees in tree have >>> #*-cells after "status". In some cases they are added in the board >>> .dts files, not the chip/module .dtsi files. >> >> Existing DTS is not a good example :) >> >>> >>> +1 that it makes sense at the end as they affect child nodes. >> >> I still insist that status must be the last, because: >> 1. Many SoC nodes have address/size cells but do not have any children >> (I2C, SPI), so we put useless information at the end. >> 2. Status should be the final information to say whether the node is >> ready or is not. I read the node, check properties and then look at the end: >> a. Lack of status means it is ready. >> b. status=disabled means device still needs board resources/customization > > I agree with the "status" belonging to the very end, because it's both logical > and much more readable.  Also, "status" is expected to be modified in the > dependent DT files, which makes it kind of volatile and even more deserving to > be placed last. I am just curious if having status property at the end won't affect execution/boot up time. Not sure how it is done in Linux but in U-Boot at least (we want to have DTs in sync between Linux and U-Boot) of_find_property is pretty much big loop over all properties. And status property defined at the end means going over all of them to find it out to if device is present. Not sure if Linux works in the same way but at least of_get_property is done in the same way. It is not big deal on high speed cpus but wanted to point it out. Thanks, Michal