linux-kernel - Re: [PATCH 1/2] dt-bindings: can: fsl,flexcan: add transceiver capabilities

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Message-ID: <20250212195204.GA6577@debian>
Date: Wed, 12 Feb 2025 20:52:04 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: dimitri.fedrau@...bherr.com, Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-can@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: can: fsl,flexcan: add transceiver
 capabilities

Am Tue, Feb 11, 2025 at 04:38:48PM +0000 schrieb Conor Dooley:
> On Tue, Feb 11, 2025 at 02:12:33PM +0100, Dimitri Fedrau via B4 Relay wrote:
> > From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > 
> > Currently the flexcan driver does not support adding PHYs. Add the
> > capability to ensure that the PHY is in operational state when the link
> > is set to an "up" state.
> > 
> > Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > ---
> >  Documentation/devicetree/bindings/net/can/fsl,flexcan.yaml | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/can/fsl,flexcan.yaml b/Documentation/devicetree/bindings/net/can/fsl,flexcan.yaml
> > index 97dd1a7c5ed26bb7f1b2f78c326d91e2c299938a..397957569588a61111a313cf9107e29dacc9e667 100644
> > --- a/Documentation/devicetree/bindings/net/can/fsl,flexcan.yaml
> > +++ b/Documentation/devicetree/bindings/net/can/fsl,flexcan.yaml
> > @@ -70,6 +70,9 @@ properties:
> >    xceiver-supply:
> >      description: Regulator that powers the CAN transceiver.
> >  
> > +  phys:
> > +    maxItems: 1
> 
> Can all devices in this binding support external phy? Are all devices
> limited to a single external phy?
> 
As far as I know, these devices are controllers without integrated PHY.
So they need a single external PHY. Transceivers can be very simple like
xceiver-supply in the binding, but I want to use "ti,tcan1043" in 
drivers/phy/phy-can-transceiver.

Best regards,
Dimitri Fedrau

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