Re: [RFC PATCH 04/13] dt-bindings: mfd: ROHM BD72720

[Matti Vaittinen <mazziesaccount@gmail.com>]

On 13/10/2025 15:58, Linus Walleij wrote:
> Hi Matti,
> 
> thanks for your patch!

Thank You for taking the time to review of this RFC!

> On Tue, Oct 7, 2025 at 10:33 AM Matti Vaittinen
> <mazziesaccount@gmail.com> wrote:
> 
>> +  rohm,pin-dvs0:
>> +    $ref: /schemas/types.yaml#/definitions/string
>> +    description:
>> +      BD72720 has 4 different OTP options to determine the use of dvs0-pin.
>> +      OTP0 - regulator RUN state control.
>> +      OTP1 - GPI.
>> +      OTP2 - GPO.
>> +      OTP3 - Power sequencer output.
>> +      This property specifies the use of the pin.
>> +    enum:
>> +      - dvs-input
>> +      - gpi
>> +      - gpo
>> +
>> +  rohm,pin-dvs1:
>> +    $ref: /schemas/types.yaml#/definitions/string
>> +    description:
>> +      see rohm,pin-dvs0
>> +    enum:
>> +      - dvs-input
>> +      - gpi
>> +      - gpo
>> +
>> +  rohm,pin-exten0:
>> +    $ref: /schemas/types.yaml#/definitions/string
>> +    description: BD72720 has an OTP option to use exten0-pin for different
>> +      purposes. Set this property accrdingly.
> 
> accordingly?
> 
>> +    const: gpo
>> +
>> +  rohm,pin-exten1:
>> +    $ref: /schemas/types.yaml#/definitions/string
>> +    description: BD72720 has an OTP option to use exten1-pin for different
>> +      purposes. Set this property accrdingly.
> 
> accordingly?
> 
>> +    const: gpo
>> +
>> +  rohm,pin-fault_b:
>> +    $ref: /schemas/types.yaml#/definitions/string
>> +    description: BD72720 has an OTP option to use fault_b-pin for different
>> +      purposes. Set this property accrdingly.
> 
> accordingly?

Gah. Well spotted, thanks!

> 
>> +    const: gpo
> 
> These are a bit idiomatic, not using the actual framework for such
> things (pin control) BUT: they are on the other hand crystal
> clear for an integrator working with this device tree, and only
> four pins so why over-engineer it. I am fine
> with them if the DT people are.

I kind of like to emphasize the fact that this is not really a pin-mux 
in a traditional sense. We can't change the routing after OTP is 
written. As such, it more resembles "wiring" of the signal inside the 
PMIC, and this property is not a control but tells us how the signal is 
wired. But yeah, let's see what others think of it.

Yours,
	-- Matti