linux-kernel - Re: [PATCH v4 1/6] dt-bindings: phy: ti,tcan104x-can: Document NXP TJA105X/1048

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Message-ID: <20250901-uproar-shrill-07d51ea21a29@spud>
Date: Mon, 1 Sep 2025 20:00:25 +0100
From: Conor Dooley <conor@...nel.org>
To: Peng Fan <peng.fan@....com>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	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>,
	Aswath Govindraju <a-govindraju@...com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Frank Li <frank.li@....com>,
	Haibo Chen <haibo.chen@....com>, linux-can@...r.kernel.org,
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/6] dt-bindings: phy: ti,tcan104x-can: Document NXP
 TJA105X/1048

On Mon, Sep 01, 2025 at 07:54:01PM +0100, Conor Dooley wrote:
> On Mon, Sep 01, 2025 at 11:18:11AM +0800, Peng Fan wrote:
> > The TJA105[1,7] is a high-speed CAN transceiver which is a pin-compatible
> > alternative for TI TCAN1043 with sleep mode supported, and has a compatible
> > programming model, therefore use ti,tcan1043 as fallback compatible.
> > 
> > The TJA1048 is a dual high-speed CAN transceiver with sleep mode supported.
> > 
> > Reviewed-by: Frank Li <Frank.Li@....com>
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  .../devicetree/bindings/phy/ti,tcan104x-can.yaml   | 30 ++++++++++++++++++++--
> >  1 file changed, 28 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
> > index 4a8c3829d85d3c4a4963750d03567c1c345beb91..f8e0c24856a2ba83b5c988b246464f47e11a032f 100644
> > --- a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
> > +++ b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
> > @@ -19,18 +19,25 @@ properties:
> >            - enum:
> >                - microchip,ata6561
> >            - const: ti,tcan1042
> > +      - items:
> > +          - enum:
> > +              - nxp,tja1051
> > +              - nxp,tja1057
> > +          - const: ti,tcan1043
> >        - enum:
> >            - ti,tcan1042
> >            - ti,tcan1043
> > +          - nxp,tja1048
> >            - nxp,tjr1443
> >  
> >    '#phy-cells':
> > -    const: 0
> > +    enum: [0, 1]
> >  
> >    standby-gpios:
> >      description:
> >        gpio node to toggle standby signal on transceiver
> > -    maxItems: 1
> > +    minItems: 1
> > +    maxItems: 2
> 
> You're adding a second standby gpio, which one is which?
> I assume you mean that item 1 is stbn1 and item 2 is stbn 2 for tja1048.
> Might be kinda obvious, but I think it should be mentioned.
> 
> tja105{1,7} don't have a standby gpio, but they do have a silent mode.
> silent mode seems fundamentally different to standby, since the receiver
> still works. Seems like that should be handled differently, no?

The docs for standby mode for the tcan1043 don't match with the tja1051,
"Standby mode is a low power mode where the driver and receiver are
disabled," so does the fallback compatible even make sense? Seems like a
combination of enable and standby gpios are used to put the tcan device
into silent mode but the tja1051 has a pin for that alone and seemingly
does not support standby at all?

> 
> >  
> >    enable-gpios:
> >      description:
> > @@ -53,6 +60,25 @@ required:
> >    - compatible
> >    - '#phy-cells'
> >  
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: nxp,tja1048
> > +    then:
> > +      properties:
> > +        '#phy-cells':
> > +          const: 1
> > +        standby-gpios:
> > +          minItems: 2
> > +    else:
> > +      properties:
> > +        '#phy-cells':
> > +          const: 0
> > +        standby-gpios:
> > +          maxItems: 1
> > +
> >  additionalProperties: false
> >  
> >  examples:
> > 
> > -- 
> > 2.37.1
> > 



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