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Date:   Fri, 7 Jul 2023 09:20:56 -0600
From:   Rob Herring <robh@kernel.org>
To:     Gatien CHEVALLIER <gatien.chevallier@foss.st.com>
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Subject: Re: [PATCH 04/10] dt-bindings: treewide: add feature-domains
 description in binding files
Message-ID: <20230707152056.GA317056-robh@kernel.org>
References: <20230705172759.1610753-1-gatien.chevallier@foss.st.com>
 <20230705172759.1610753-5-gatien.chevallier@foss.st.com>
 <20230706145108.GA3858320-robh@kernel.org>
 <0aaace47-1bb4-82c5-57a5-6f5d27eb4d45@foss.st.com>
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On Fri, Jul 07, 2023 at 02:28:28PM +0200, Gatien CHEVALLIER wrote:
> Hello Rob,
> 
> On 7/6/23 16:51, Rob Herring wrote:
> > On Wed, Jul 05, 2023 at 07:27:53PM +0200, Gatien Chevallier wrote:
> > > feature-domains is an optional property that allows a peripheral to
> > > refer to one or more feature domain controller(s).
> > > 
> > > Description of this property is added to all peripheral binding files of
> > > the peripheral under the STM32 firewall controllers. It allows an accurate
> > > representation of the hardware, where various peripherals are connected
> > > to this firewall bus. The firewall can then check the peripheral accesses
> > > before allowing it to probe.
> > > 
> > > Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> > > ---
> > > 
> > > Disclaimer: Some error with dtbs_check will be observed as I've
> > > considered the property to be generic, as Rob asked
> > > 
> > >   Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
> > >   Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
> > >   Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
> > >   .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
> > >   .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
> > >   Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
> > >   .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
> > >   Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
> > >   Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
> > >   Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
> > >   Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
> > >   Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
> > >   .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
> > >   Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
> > >   Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
> > >   .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
> > >   Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
> > >   Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
> > >   24 files changed, 97 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > index b767ec72a999..daf8dcaef627 100644
> > > --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > @@ -50,6 +50,10 @@ properties:
> > >     power-domains:
> > >       maxItems: 1
> > > +  feature-domains:
> > > +    minItems: 1
> > > +    maxItems: 3
> > 
> > What are the 3 entries?
> > 
> > Rob
> 
> I thought I was benefiting from the description of the pattern-property in
> the RIFSC YAML file. But yes anyway, it seems like it needs some description
> here as the dependency does not appear in this file.

Humm, that should limit the maximum entries to 2, so 3 would never work 
(if RIFSC is the parent). 

> I picked 3 as a maxItems for our ST needs, I'll give it some more thought
> when coming back with something clearer.

I'd expect you have 1 entry for register bus and 1 entry for DMA bus if 
there is one. It's block specific for how many entries, so the RIFSC 
schema should not be setting that. You could possibly say that 
'feature-domains' is required for all the child nodes though.

Rob