netdev - Re: [PATCH 1/5] dt-bindings: can: tcan4x5x: Add tcan4552 and tcan4553 variants

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Message-ID: <20230315112508.6q52rekhmk66uiwj@pengutronix.de>
Date:   Wed, 15 Mar 2023 12:25:08 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Markus Schneider-Pargmann <msp@...libre.com>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vincent MAILHOL <mailhol.vincent@...adoo.fr>,
        Simon Horman <simon.horman@...igine.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindings: can: tcan4x5x: Add tcan4552 and
 tcan4553 variants

On 14.03.2023 21:01:10, Krzysztof Kozlowski wrote:
> On 14/03/2023 16:11, Markus Schneider-Pargmann wrote:
> > These two new chips do not have state or wake pins.
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> > ---
> >  .../devicetree/bindings/net/can/tcan4x5x.txt          | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
> > index e3501bfa22e9..38a2b5369b44 100644
> > --- a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
> > +++ b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
> > @@ -4,7 +4,10 @@ Texas Instruments TCAN4x5x CAN Controller
> >  This file provides device node information for the TCAN4x5x interface contains.
> >  
> >  Required properties:
> > -	- compatible: "ti,tcan4x5x"
> > +	- compatible:
> > +		"ti,tcan4x5x" or
> > +		"ti,tcan4552" or
> > +		"ti,tcan4553"
> 
> Awesome, they nicely fit into wildcard... Would be useful to deprecate
> the wildcard at some point and switch to proper compatibles in such
> case, because now they became confusing.

I plead for DT stability!

As I understand correctly, the exact version of the chip (4550, 4552, or
4553) can be detected via the ID2 register.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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