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

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Message-ID: <20250213-scariness-enhance-56eda6901f69@spud>
Date: Thu, 13 Feb 2025 20:07:22 +0000
From: Conor Dooley <conor@...nel.org>
To: Dimitri Fedrau <dima.fedrau@...il.com>
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

On Wed, Feb 12, 2025 at 08:52:04PM +0100, Dimitri Fedrau wrote:
> 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.

I'm not quite following, do all of these devices need to have an
external phy but the property did not exist until now? How did any of
them work, if that's the case?

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