linux-kernel - Re: [PATCH] dt-bindings: mfd: Explain lack of child dependency in simple-mfd

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Date: Mon, 24 Jun 2024 12:10:57 +0100
From: Lee Jones <lee@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: mfd: Explain lack of child dependency in
 simple-mfd

On Sun, 23 Jun 2024, Krzysztof Kozlowski wrote:

> On 21/06/2024 13:10, Lee Jones wrote:
> > On Thu, 20 Jun 2024, Krzysztof Kozlowski wrote:
> > 
> >> On 20/06/2024 19:17, Lee Jones wrote:
> >>> On Sun, 16 Jun 2024, Krzysztof Kozlowski wrote:
> >>>
> >>>> Common mistake of usage of 'simple-mfd' compatible is a dependency of
> >>>> children on resources acquired and managed by the parent, e.g. clocks.
> >>>> Extend the simple-mfd documentation to cover this case.
> >>>>
> >>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> >>>> ---
> >>>>  Documentation/devicetree/bindings/mfd/mfd.txt | 13 +++++++------
> >>>>  1 file changed, 7 insertions(+), 6 deletions(-)
> >>>>
> >>>> diff --git a/Documentation/devicetree/bindings/mfd/mfd.txt b/Documentation/devicetree/bindings/mfd/mfd.txt
> >>>> index 336c0495c8a3..98b4340b65f3 100644
> >>>> --- a/Documentation/devicetree/bindings/mfd/mfd.txt
> >>>> +++ b/Documentation/devicetree/bindings/mfd/mfd.txt
> >>>> @@ -18,12 +18,13 @@ A typical MFD can be:
> >>>>  Optional properties:
> >>>>  
> >>>>  - compatible : "simple-mfd" - this signifies that the operating system should
> >>>> -  consider all subnodes of the MFD device as separate devices akin to how
> >>>> -  "simple-bus" indicates when to see subnodes as children for a simple
> >>>> -  memory-mapped bus. For more complex devices, when the nexus driver has to
> >>>> -  probe registers to figure out what child devices exist etc, this should not
> >>>> -  be used. In the latter case the child devices will be determined by the
> >>>> -  operating system.
> >>>> +  consider all subnodes of the MFD device as separate and independent devices
> >>>> +  akin to how "simple-bus" indicates when to see subnodes as children for a
> >>>> +  simple memory-mapped bus. "Independent devices" means that children do not
> >>>
> >>> I'm not against the change, but I think it can be phased better.
> >>>
> >>> Quoting the new part and going on to explain what you mean by it doesn't
> >>> flow very well.  Are you able to massage it so it reads a little more
> >>> nicely please?
> >>
> >> Does this feels better?
> >>
> >> compatible : "simple-mfd" - this signifies that the operating system
> >> should consider all subnodes of the MFD device as separate and
> >> independent devices, so not needing any resources to be provided by the
> >> parent device. Similarly to how "simple-bus" indicates when to see
> >> subnodes as children for a simple memory-mapped bus.
> >>
> >> For more complex devices, when the nexus driver has to probe registers
> >> to figure out what child devices exist etc, this should not be used. In
> >> the latter case the child devices will be determined by the operating
> >> system.
> > 
> > Flows a lot better, yes.
> 
> Sure.
> 
> > 
> > Submit it and please include the original author this time.
> 
> Everything is scripted, so you ask me for additional, manual steps just
> to find the author and then Cc-them. I'll do it but it would be much
> easier if the interested party added themself as reviewer or maintainer
> of the binding.

How you set-up your tooling is your business.  =;)

Who to Cc is often situation dependent, some of the semantics you'd find
hard to script.  `scripts/get_maintainer.pl` provides some helpful
arguments (e.g. --git-min-percent 75) which seem to work a lot of the
time.

In this particular case, you're making heavy changes to a passage of text
which someone has taken the time to craft.  Adding them to the
conversation should be seen as a common courtesy.

-- 
Lee Jones [李琼斯]