linux-kernel - Re: [PATCH v3 1/2] dt-bindings: phy: add support for NXPs TJA1145 CAN transceiver

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Message-ID: <20251014121926.GA63762@legfed1>
Date: Tue, 14 Oct 2025 14:19:26 +0200
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: dimitri.fedrau@...bherr.com, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: phy: add support for NXPs TJA1145
 CAN transceiver

Am Mon, Oct 13, 2025 at 08:41:49PM +0100 schrieb Conor Dooley:
> On Mon, Oct 13, 2025 at 11:19:18AM +0200, Dimitri Fedrau via B4 Relay wrote:
> > From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > 
> > Adding documentation for NXPs TJA1145 CAN transceiver, which resides like
> > the ti,tcan104x-can.yaml in the same directory as other generic PHY
> > subsystem bindings. At the moment there is only support for simple PHYs
> > by using regulator bindings in combination with can-transceiver.yaml or
> > PHYs that implement the generic PHY subsystem like the NXP TJA1145.
> > 
> > Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > ---
> >  .../devicetree/bindings/phy/nxp,tja1145-can.yaml   | 79 ++++++++++++++++++++++
> >  1 file changed, 79 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/nxp,tja1145-can.yaml b/Documentation/devicetree/bindings/phy/nxp,tja1145-can.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..3b81a2e1ead8452ed5fcf2021f33d628d4e12346
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/nxp,tja1145-can.yaml
> > @@ -0,0 +1,79 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/phy/nxp,tja1145-can.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: TJA1145 CAN transceiver
> > +
> > +maintainers:
> > +  - Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > +
> > +allOf:
> > +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: nxp,tja1145-can
> 
> I'd drop the -can here, since I don't think the device can be anything
> else?
>
Will drop the -can. Device cannot be anything else.

> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  "#phy-cells":
> > +    const: 0
> > +
> > +  spi-max-frequency:
> > +    maximum: 4000000
> > +
> > +  spi-cpha: true
> 
> Is this optionally cpha or always? I'd mark it required if it is always
> needed for the device to function.
> 
According to the datasheet it is cpha. Didn't test if the device is
running with a different configuration. I mark it as required then.

> > +
> > +  spi-cs-setup-delay-ns:
> > +    minimum: 50
> > +    default: 50
> > +
> > +  spi-cs-hold-delay-ns:
> > +    minimum: 50
> > +    default: 50
> > +
> > +  spi-cs-inactive-delay-ns:
> > +    minimum: 250
> > +    default: 250
> > +
> > +  vcc-supply:
> > +    description:
> > +      CAN transceiver supply voltage
> > +
> > +  vio-supply:
> > +    description:
> > +      Supply voltage for I/O level adaptor
> > +
> > +  vbat-supply:
> > +    description:
> > +      Battery supply voltage
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - "#phy-cells"
> > +
> > +unevaluatedProperties: false
> 
> If the properties you've listed above from spi-peripheral-props are the
> only ones suitable for the device, I think additionalProperties: false
> is sufficient here.
> 
I switch to additionalProperties: false then

Best regards,
Dimitri Fedrau