linux-kernel - Re: [PATCH v8 1/4] dt-bindings: can: m

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Message-Id: <DC6876NJBA2V.3OEXXYEA6Z9TK@baylibre.com>
Date: Tue, 19 Aug 2025 09:29:02 +0200
From: "Markus Schneider-Pargmann" <msp@...libre.com>
To: "Markus Schneider-Pargmann" <msp@...libre.com>, "Marc Kleine-Budde"
 <mkl@...gutronix.de>
Cc: "Chandrasekar Ramakrishnan" <rcsekar@...sung.com>, "Rob Herring"
 <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor
 Dooley" <conor+dt@...nel.org>, "Vishal Mahaveer" <vishalm@...com>, "Kevin
 Hilman" <khilman@...libre.com>, "Dhruva Gole" <d-gole@...com>, "Sebin
 Francis" <sebin.francis@...com>, "Kendall Willis" <k-willis@...com>,
 "Akashdeep Kaur" <a-kaur@...com>, "Simon Horman" <horms@...nel.org>,
 "Vincent MAILHOL" <mailhol.vincent@...adoo.fr>,
 <linux-can@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 1/4] dt-bindings: can: m_can: Add wakeup properties

On Tue Aug 19, 2025 at 9:20 AM CEST, Markus Schneider-Pargmann wrote:
> Hi,
>
> On Wed Aug 13, 2025 at 9:23 AM CEST, Marc Kleine-Budde wrote:
>> On 12.08.2025 11:10:22, Markus Schneider-Pargmann wrote:
>>> The pins associated with m_can have to have a special configuration to
>>> be able to wakeup the SoC from some system states. This configuration is
>>> described in the wakeup pinctrl state while the default state describes
>>> the default configuration.
>>> 
>>> Also m_can can be a wakeup-source if capable of wakeup.
>>> 
>>> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
>>> ---
>>>  .../devicetree/bindings/net/can/bosch,m_can.yaml   | 22 ++++++++++++++++++++++
>>>  1 file changed, 22 insertions(+)
>>> 
>>> diff --git a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
>>> index c4887522e8fe97c3947357b4dbd4ecf20ee8100a..ecba8783198fc1658fcc236d8aa3c89d8c90abbd 100644
>>> --- a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
>>> +++ b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
>>> @@ -106,6 +106,22 @@ properties:
>>>          maximum: 32
>>>      minItems: 1
>>>  
>>> +  pinctrl-0:
>>> +    description: Default pinctrl state
>>> +
>>> +  pinctrl-1:
>>> +    description: Wakeup pinctrl state
>>> +
>>> +  pinctrl-names:
>>> +    description:
>>> +      When present should contain at least "default" describing the default pin
>>> +      states. The second state called "wakeup" describes the pins in their
>>> +      wakeup configuration required to exit sleep states.
>>> +    minItems: 1
>>> +    items:
>>> +      - const: default
>>> +      - const: wakeup
>>> +
>>
>> This breaks at least the stm32mp15 SoCs that define a sleep state:
>>
>> &m_can1 {
>> 	resets = <&rcc FDCAN_R>;
>> 	pinctrl-names = "default", "sleep";
>> 	pinctrl-0 = <&m_can1_pins_b>;
>> 	pinctrl-1 = <&m_can1_sleep_pins_b>;
>> 	status = "okay";
>> };
>
> I am struggling to find binding documentation that explicitly lists
> this sleep pinctrl state. So what is the intended purpose here? Also the
> driver does nothing with this at the moment right?
>
> I mean I can also add a sleep state to the binding or just leave the
> binding empty so it can be anything, but that feels wrong.

Sorry, I missed the sleep use in the driver, will add it to the binding. I am
wondering why it wasn't in the binding before.

Thanks!

Best
Markus

>
> Best
> Markus
>
>>
>>>    power-domains:
>>>      description:
>>>        Power domain provider node and an args specifier containing
>>> @@ -122,6 +138,12 @@ properties:
>>>      minItems: 1
>>>      maxItems: 2
>>>  
>>> +  wakeup-source:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +    description:
>>> +      List of phandles to system idle states in which mcan can wakeup the system.
>>> +
>>> +
>>
>> One newline should be enough.
>>
>>>  required:
>>>    - compatible
>>>    - reg
>>> 
>>> -- 
>>> 2.50.1
>>> 
>>> 
>>> 
>>
>> Marc


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