linux-kernel - Re: [PATCH] dt-bindings: clock: si5351: Make compatible string required property

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Message-ID: <20241002214129.GA1347474-robh@kernel.org>
Date: Wed, 2 Oct 2024 16:41:29 -0500
From: Rob Herring <robh@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Michal Simek <michal.simek@....com>, linux-kernel@...r.kernel.org,
	monstr@...str.eu, michal.simek@...inx.com, git@...inx.com,
	Alvin Šipraga <alsi@...g-olufsen.dk>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	"open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>
Subject: Re: [PATCH] dt-bindings: clock: si5351: Make compatible string
 required property

On Wed, Oct 02, 2024 at 02:17:22PM +0200, Krzysztof Kozlowski wrote:
> On 02/10/2024 12:31, Michal Simek wrote:
> > 
> > 
> > On 10/2/24 10:24, Michal Simek wrote:
> >>
> >>
> >> On 10/2/24 10:19, Krzysztof Kozlowski wrote:
> >>> On 02/10/2024 09:51, Michal Simek wrote:
> >>>> Compatible property is likely also required property.
> >>>>
> >>>> Signed-off-by: Michal Simek <michal.simek@....com>
> >>>> ---
> >>>
> >>> That's a convention but not necessary, a no-op.
> >>
> >> But how do you identify device then?
> >> Or are you saying that device description is valid even if there is no 
> >> compatible string?
> > 
> > One more thing
> > commit 524dfbc4e9fc ("dt-bindings: clock: si5351: convert to yaml") is showing
> > that compatible property was required in txt file.
> > 
> > -Required properties:
> > -- compatible: shall be one of the following:
> > -       "silabs,si5351a" - Si5351a, QFN20 package
> > -       "silabs,si5351a-msop" - Si5351a, MSOP10 package
> > 
> > I can update commit message to describe it too.
> 
> Devices do not work without compatible, so this is obvious... and like
> said - it is already required, so the change is redundant. Does not
> harm, though.

To put it another way, by the time the schema is applied, we already 
know that compatible is present because that is *how* the schema gets 
applied in the first place.

Rob