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

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Message-ID: <20251013-supplier-edition-0ffc88286b5d@spud>
Date: Mon, 13 Oct 2025 20:41:49 +0100
From: Conor Dooley <conor@...nel.org>
To: dimitri.fedrau@...bherr.com
Cc: 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,
	Dimitri Fedrau <dima.fedrau@...il.com>,
	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

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?

> +
> +  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.

> +
> +  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.

Cheers,
Conor.

pw-bot: changes-requested

> +
> +examples:
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        can-phy@0 {
> +            compatible = "nxp,tja1145-can";
> +            reg = <0>;
> +            #phy-cells = <0>;
> +            spi-max-frequency = <4000000>;
> +            spi-cpha;
> +            spi-cs-setup-delay-ns = <50>;
> +            spi-cs-hold-delay-ns = <50>;
> +            spi-cs-inactive-delay-ns = <250>;
> +            vcc-supply = <&reg_5v0>;
> +            vio-supply = <&reg_3v3>;
> +            vbat-supply = <&reg_24v0>;
> +        };
> +    };
> 
> -- 
> 2.39.5
> 
> 

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