linux-kernel - Re: [PATCH v1 1/1] hwmon: (pmbus) Add regulator supply into macro

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Date:   Thu, 17 Feb 2022 09:36:51 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marcello Sylvester Bauer <sylv@...v.io>,
        Jean Delvare <jdelvare@...e.com>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>
Subject: Re: [PATCH v1 1/1] hwmon: (pmbus) Add regulator supply into macro

On 2/17/22 02:23, Marcello Sylvester Bauer wrote:
> Add optional regulator supply into PWBUS_REGULATOR macro. This makes it

The code doesn't look optional to me. What exactly is optional ?

> possible to define a vin-supply in DT. Not defining a supply will only
> cause the following debug output:
> 
> ```
> Looking up vin-supply property in node [...] failed
> ```
> 
> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
> ---
>   drivers/hwmon/pmbus/pmbus.h | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index e0aa8aa46d8c..38f049d68d32 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -464,6 +464,7 @@ extern const struct regulator_ops pmbus_regulator_ops;
>   #define PMBUS_REGULATOR(_name, _id)				\
>   	[_id] = {						\
>   		.name = (_name # _id),				\
> +		.supply_name = "vin",				\
>   		.id = (_id),					\
>   		.of_match = of_match_ptr(_name # _id),		\
>   		.regulators_node = of_match_ptr("regulators"),	\

That seems to be quite far reaching. How does this affect / change behavior
of existing systems which so far did not expect supply_name to be set ?

Guenter