linux-kernel - Re: [PATCH] Revert "hwmon: (pmbus) Add regulator supply into macro"

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Date:   Sun, 6 Nov 2022 17:32:15 +0100
From:   Marcello Sylverster Bauer <sylv@...v.io>
To:     Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Zev Weiss <zev@...ilderbeest.net>,
        naresh.solanki@...ements.com
Subject: Re: [PATCH] Revert "hwmon: (pmbus) Add regulator supply into macro"

On 11/5/22 00:46, Guenter Roeck wrote:
> This reverts commit 54cc3dbfc10dc3db7cb1cf49aee4477a8398fbde.
>
> Zev Weiss reports that the reverted patch may cause a regulator
> undercount. Here is his report:
>
> ... having regulator-dummy set as a supply on my PMBus regulators
> (instead of having them as their own top-level regulators without
> an upstream supply) leads to enable-count underflow errors when
> disabling them:
>
>      # echo 0 > /sys/bus/platform/devices/efuse01/state
>      [  906.094477] regulator-dummy: Underflow of regulator enable count
>      [  906.100563] Failed to disable vout: -EINVAL
>      [  136.992676] reg-userspace-consumer efuse01: Failed to configure state: -22
>
> Zev reports that reverting the patch fixes the problem. So let's do that
> for now.
>
> Fixes: 54cc3dbfc10d ("hwmon: (pmbus) Add regulator supply into macro")
> Cc: Marcello Sylvester Bauer <sylv@...v.io>
> Reported-by: Zev Weiss <zev@...ilderbeest.net>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Marcello Sylvester Bauer <sylv@...v.io>
> ---
>   drivers/hwmon/pmbus/pmbus.h | 1 -
>   1 file changed, 1 deletion(-)
>
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index 7daaf0caf4d3..10fb17879f8e 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -467,7 +467,6 @@ extern const struct regulator_ops pmbus_regulator_ops;
>   #define PMBUS_REGULATOR_STEP(_name, _id, _voltages, _step)  \
>   	[_id] = {						\
>   		.name = (_name # _id),				\
> -		.supply_name = "vin",				\
>   		.id = (_id),					\
>   		.of_match = of_match_ptr(_name # _id),		\
>   		.regulators_node = of_match_ptr("regulators"),	\