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

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Message-ID: <54aae3b8-ee85-c7eb-ecda-f574cb140675@linaro.org>
Date:   Wed, 15 Mar 2023 14:14:27 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
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 15/03/2023 12:25, Marc Kleine-Budde wrote:
> 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.

So maybe there is no need for this patch at all? Or the new compatibles
should be made compatible with generic fallback?

Best regards,
Krzysztof