linux-kernel - Re: [PATCH RESEND v1 2/7] dt-bindings: can: mpfs: add missing required clock

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Date:   Thu, 14 Dec 2023 13:16:55 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     linux-riscv@...ts.infradead.org,
        Conor Dooley <conor.dooley@...rochip.com>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "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>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH RESEND v1 2/7] dt-bindings: can: mpfs: add missing
 required clock

On Thu, Dec 14, 2023 at 12:31:04PM +0100, Marc Kleine-Budde wrote:
> On 13.12.2023 13:02:49, Conor Dooley wrote:
> > On Tue, Dec 12, 2023 at 09:49:41PM +0100, Marc Kleine-Budde wrote:
> > > On 08.12.2023 17:12:24, Conor Dooley wrote:
> > > > From: Conor Dooley <conor.dooley@...rochip.com>
> > > > 
> > > > The CAN controller on PolarFire SoC has an AHB peripheral clock _and_ a
> > > > CAN bus clock. The bus clock was omitted when the binding was written,
> > > > but is required for operation. Make up for lost time and add it.
> > > > 
> > > > Cautionary tale in adding bindings without having implemented a real
> > > > user for them perhaps.
> > > > 
> > > > Fixes: c878d518d7b6 ("dt-bindings: can: mpfs: document the mpfs CAN controller")
> > > > Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> > > > ---
> > > >  .../devicetree/bindings/net/can/microchip,mpfs-can.yaml    | 7 +++++--
> > > >  1 file changed, 5 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/Documentation/devicetree/bindings/net/can/microchip,mpfs-can.yaml b/Documentation/devicetree/bindings/net/can/microchip,mpfs-can.yaml
> > > > index 45aa3de7cf01..05f680f15b17 100644
> > > > --- a/Documentation/devicetree/bindings/net/can/microchip,mpfs-can.yaml
> > > > +++ b/Documentation/devicetree/bindings/net/can/microchip,mpfs-can.yaml
> > > > @@ -24,7 +24,10 @@ properties:
> > > >      maxItems: 1
> > > >  
> > > >    clocks:
> > > > -    maxItems: 1
> > > > +    maxItems: 2
> > > > +    items:
> > > > +      - description: AHB peripheral clock
> > > > +      - description: CAN bus clock
> > > 
> > > Do we we want to have a "clock-names" property, as we need the clock
> > > rate of the CAN bus clock.
> > 
> > We should not need the clock-names property to be able to get both of
> > the clocks. clk_bulk_get_all() for example should be usable here.
> 
> ACK, but we need the clock rate of CAN clock. Does this binding check
> that the CAN clock rate is the 2nd one?

The items list requires that the can clock be the second one, so drivers
etc can rely on that ordering.

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