linux-kernel - Re: [PATCH net-next v2 09/10] dt-bindings: net: snps,dwmac: add per channel irq support

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Message-ID: <20230810-opossum-constable-719273142ce3@spud>
Date:   Thu, 10 Aug 2023 17:15:26 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 09/10] dt-bindings: net: snps,dwmac: add per
 channel irq support

On Thu, Aug 10, 2023 at 11:59:06PM +0800, Jisheng Zhang wrote:
> On Tue, Aug 08, 2023 at 08:39:58AM +0100, Conor Dooley wrote:
> > On Tue, Aug 08, 2023 at 12:41:50AM +0800, Jisheng Zhang wrote:
> > > The IP supports per channel interrupt, add support for this usage case.
> > > 
> > > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> > > ---
> > >  .../devicetree/bindings/net/snps,dwmac.yaml   | 33 +++++++++++++++++++
> > >  1 file changed, 33 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > > index 5d81042f5634..5a63302ad200 100644
> > > --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > > +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > > @@ -109,6 +109,7 @@ properties:
> > >        - description: The interrupt that occurs when Rx exits the LPI state
> > >        - description: The interrupt that occurs when Safety Feature Correctible Errors happen
> > >        - description: The interrupt that occurs when Safety Feature Uncorrectible Errors happen
> > > +      - description: All of the rx/tx per-channel interrupts
> > >  
> > >    interrupt-names:
> > >      minItems: 1
> > > @@ -118,6 +119,38 @@ properties:
> > >        - const: eth_lpi
> > >        - const: sfty_ce
> > >        - const: sfty_ue
> > > +      - const: rx0
> > > +      - const: rx1
> > > +      - const: rx2
> > > +      - const: rx3
> > > +      - const: rx4
> > > +      - const: rx5
> > > +      - const: rx6
> > > +      - const: rx7
> > > +      - const: rx8
> > > +      - const: rx9
> > > +      - const: rx10
> > > +      - const: rx11
> > > +      - const: rx12
> > > +      - const: rx13
> > > +      - const: rx14
> > > +      - const: rx15
> > > +      - const: tx0
> > > +      - const: tx1
> > > +      - const: tx2
> > > +      - const: tx3
> > > +      - const: tx4
> > > +      - const: tx5
> > > +      - const: tx6
> > > +      - const: tx7
> > > +      - const: tx8
> > > +      - const: tx9
> > > +      - const: tx10
> > > +      - const: tx11
> > > +      - const: tx12
> > > +      - const: tx13
> > > +      - const: tx14
> > > +      - const: tx15
> > 
> > I don't think Rob's comment about having added 2 interrupts but 32
> > interrupt names has been resolved.
> 
> I misunderstood Rob's comment. Now I'm not sure whether dt-binding
> can support regex or something or not, or let ask for advice in the
> following way: how could I write the dt-binding in this case? I didn't
> find similar examples so far. I'm not sure listing possible
> description and const properties for all channel interrupts is suitable.

I'm not sure that there is a better way. Rob maybe has a suggestion.

> > Did you actually test putting this many interrupts into a node?
> > AFAICT, any more than 6 will cause complaints.
> 
> I tried 12rx and 12tx interrupts in a node, didn't see dtc warning.
> so I guess the complaints are from dtb check? I will try to reproduce
> them.

I triggered some by putting more entries into the example in this
binding & doing dt binding check.

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