linux-kernel - Re: [PATCH v2 1/3] hwmon: (pmbus/core): Update regulator flag map

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Date:   Mon, 28 Nov 2022 14:41:34 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>
Cc:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] hwmon: (pmbus/core): Update regulator flag map

On 11/28/22 09:47, Naresh Solanki wrote:
> Add regulator flag map for PMBUS status byte & status input.
> 
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>

You are adding a lot of input errors here. The regulator documentation
only covers output errors. I am not sure if this set of changes is
really appropriate. You'll have to make a much better case for those changes;
from what I can see they are all controversial and were originally left out
on purpose.

> ---
>   drivers/hwmon/pmbus/pmbus_core.c | 30 ++++++++++++++++++++++--------
>   1 file changed, 22 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index 95e95783972a..f5caceaaef2a 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -2752,6 +2752,15 @@ struct pmbus_regulator_status_category {
>   
>   static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] = {
>   	{
> +		.func = -1,

This would need a comment. I don't really see the benefit over the original
code.

> +		.reg = PMBUS_STATUS_BYTE,
> +		.bits = (const struct pmbus_regulator_status_assoc[]) {
> +			{ PB_STATUS_IOUT_OC,   REGULATOR_ERROR_OVER_CURRENT },
> +			{ PB_STATUS_VOUT_OV,   REGULATOR_ERROR_REGULATION_OUT },
> +			{ PB_STATUS_VIN_UV,    REGULATOR_ERROR_UNDER_VOLTAGE },
> +			{ },
> +		},
> +	}, {
>   		.func = PMBUS_HAVE_STATUS_VOUT,
>   		.reg = PMBUS_STATUS_VOUT,
>   		.bits = (const struct pmbus_regulator_status_assoc[]) {
> @@ -2768,6 +2777,7 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
>   			{ PB_IOUT_OC_WARNING,    REGULATOR_ERROR_OVER_CURRENT_WARN },
>   			{ PB_IOUT_OC_FAULT,      REGULATOR_ERROR_OVER_CURRENT },
>   			{ PB_IOUT_OC_LV_FAULT,   REGULATOR_ERROR_OVER_CURRENT },
> +			{ PB_POUT_OP_FAULT,      REGULATOR_ERROR_OVER_CURRENT },

OP_FAULT (power fault) and over current are really not the same thing.

>   			{ },
>   		},
>   	}, {
> @@ -2778,6 +2788,18 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
>   			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP },
>   			{ },
>   		},
> +	}, {
> +		.func = PMBUS_HAVE_STATUS_INPUT,
> +		.reg = PMBUS_STATUS_INPUT,
> +		.bits = (const struct pmbus_regulator_status_assoc[]) {
> +			{ PB_IIN_OC_FAULT,       REGULATOR_ERROR_OVER_CURRENT },
> +			{ PB_IIN_OC_WARNING,     REGULATOR_ERROR_OVER_CURRENT_WARN },
> +			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE },
> +			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN },
> +			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN },
> +			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_OVER_VOLTAGE_WARN },

fault -> warning ? Shouldn't this be REGULATOR_ERROR_FAIL (Regulator
output has failed) ?

> +			{ },
> +		},
>   	},
>   };
>   
> @@ -2834,14 +2856,6 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
>   		if (status & PB_STATUS_POWER_GOOD_N)
>   			*flags |= REGULATOR_ERROR_REGULATION_OUT;
>   	}
> -	/*
> -	 * Unlike most other status bits, PB_STATUS_{IOUT_OC,VOUT_OV} are
> -	 * defined strictly as fault indicators (not warnings).
> -	 */
> -	if (status & PB_STATUS_IOUT_OC)
> -		*flags |= REGULATOR_ERROR_OVER_CURRENT;
> -	if (status & PB_STATUS_VOUT_OV)
> -		*flags |= REGULATOR_ERROR_REGULATION_OUT;
>   
>   	/*
>   	 * If we haven't discovered any thermal faults or warnings via
> 
> base-commit: 9494c53e1389b120ba461899207ac8a3aab2632c