[PATCH v3] docs: dt-bindings: add DTS Coding Style document

[Dragan Simic]

On 2023-11-29 11:43, Krzysztof Kozlowski wrote:
> On 28/11/2023 21:00, Dragan Simic wrote:
>> 
>> I went through the language of the entire patch, after the notice that
>> the v4 would no longer accept language improvements.  My wording- and
>> grammar-related suggestions are available inline below.
> 
> Thanks. I want to finish this at some point and it might not happen if
> grammar fixes will be coming every patch revision. Then after we finish
> review, new feedback will appear about using British or American
> spelling (which reminds me old quote/email about which variant of
> English is most popular in Linux kernel: the incorrect one).

Ah, that's a good one. :)  Basically, both English variants should be 
fine, but a single document should obviously use only one variant.

>>> +=====================================
>>> +Devicetree Sources (DTS) Coding Style
>>> +=====================================
>>> +
>>> +When writing Devicetree Sources (DTS) please observe below 
>>> guidelines.
>>>  They
>> 
>> The sentence above should be replaced with: "The following guidelines
>> are to be followed when writing Devicetree Source (DTS) files."
> 
> Are you sure? It's passive and I was taught it is discouraged for
> writing. See for example:
> https://www.hamilton.edu/academics/centers/writing/seven-sins-of-writing/1

Hmm, you're right, passive voice is usually not the best choice.  Here's 
my take two for the suggested replacement sentence, which is actually a 
simplified version:

"This document contains the guidelines for writing Devicetree Source 
(DTS) files."

>>> +should be considered complementary to any rules expressed already in
>>> Devicetree
>>> +Specification and dtc compiler (including W=1 and W=2 builds).
>> 
>> A definite article ("the") should be added before "Devicetree
> 
> ack
> 
>> Specification" and "dtc".  Also, "Specification" in "Devicetree
>> Specification" should be capitalized.
> 
> It was.

Oh, sorry, I see now.  IIRC, it wasn't capitalized in some places, so I 
made a mistake here.

>>> +
>>> +Individual architectures and sub-architectures can add additional
>>> rules, making
>>> +the style stricter.
>> 
>> "Sub-architectures" should be replaced with "subarchitectures".  "Can
> 
> A hint, you can write such review feedback as:
> s/sub-architectures/subarchitectures/

Sure, but I specifically wanted to be less terse, as a way to be 
respectful.

> BTW, my language spelling points "subarchitectures" as mistake, but
> sure, ack.

Using hyphens or not is almost always debatable, but modern English in 
general leans toward not using them.

>>> +3. Unit addresses shall use lowercase hex, without leading zeros
>>> (padding).
>> 
>> "Lowercase hex" should be replaced with "lowercase hexadecimal 
>> digits".
>> 
>>> +
>>> +4. Hex values in properties, e.g. "reg", shall use lowercase hex.  
>>> The
>>> address
>>> +   part can be padded with leading zeros.
>> 
>> "Hex values" should be replaced with "Hexadecimal values".  "Lowercase
>> hex" should be replaced with "lowercase hexadecimal digits".
> 
> ack, but that's quite picky. We are (software) engineers so we are
> supposed to know the slang.

Sure, but this document is of a bit formal nature, so using slightly 
more formal language can only be helpful.

>>> +2. Nodes without unit addresses shall be ordered alpha-numerically 
>>> by
>>> the node
>>> +   name.  For a few types of nodes, they can be ordered by the main
>>> property
>>> +   (e.g. pin configuration states ordered by value of "pins"
>>> property).
>> 
>> "Alpha-numerically" should be replaced with "alphabetically".
> 
> Are you sure? Does alphabetical order include numbers?

That's a good question, which also crossed my mind while writing the 
suggestions down.  A more correct word would be "lexicographically", 
with something like ", with the already defined valid characters making 
the symbol set and the ACSII character set defining the ordering, " 
serving as an additional explanation.

This would be a rather formal, but also very precise definition of the 
applied ordering.

>>> +3. When extending nodes in the board DTS via &label, the entries 
>>> shall
>>> be
>>> +   ordered either alpha-numerically or by keeping the order from 
>>> DTSI
>>> (choice
>>> +   depending on sub-architecture).
>> 
>> "Alpha-numerically" should be replaced with "alphabetically".
> 
> Similar concern

I agree.  We could use "lexicographically" instead, with the precise 
definition already established earlier in the document.

>>> +board DTS, not in the SoC or SoM DTSI.  A partial exception is a
>>> common
>>> +external reference SoC-input clock, which could be coded as a
>>> fixed-clock in
>> 
>> "SoC-input" should be replaced with "SoC input".
> 
> ack, thanks!

Thank you once again for working on this document!