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

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Message-ID: <20231214-tinderbox-glitzy-60d1936ab85f-mkl@pengutronix.de>
Date:   Thu, 14 Dec 2023 12:31:04 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Conor Dooley <conor@...nel.org>
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 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?

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
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