linux-kernel - Re: [PATCH v2 4/4] pmbus (pli1209bc): Add regulator support

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Date:   Mon, 14 Feb 2022 09:40:35 -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 v2 4/4] pmbus (pli1209bc): Add regulator support

On 2/14/22 04:40, Marcello Sylvester Bauer wrote:
> Add regulator support for PLI1209BC Digital Supervisor.
> 
> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
> ---
>   drivers/hwmon/pmbus/Kconfig     |  7 +++++++
>   drivers/hwmon/pmbus/pli1209bc.c | 31 +++++++++++++++++++++++++++++++
>   2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 831db423bea0..8b8f0d8733b2 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -319,6 +319,13 @@ config SENSORS_PLI1209BC
>   	  This driver can also be built as a module. If so, the module will
>   	  be called pli1209bc.
>   
> +config SENSORS_PLI1209BC_REGULATOR
> +	bool "Regulator support for PLI1209BC"
> +	depends on SENSORS_PLI1209BC && REGULATOR
> +	help
> +	  If you say yes here you get regulator support for Vicor PLI1209BC
> +	  Digital Supervisor.
> +
>   config SENSORS_PM6764TR
>   	tristate "ST PM6764TR"
>   	help
> diff --git a/drivers/hwmon/pmbus/pli1209bc.c b/drivers/hwmon/pmbus/pli1209bc.c
> index 8a9af2ccc46f..7212d73f6e04 100644
> --- a/drivers/hwmon/pmbus/pli1209bc.c
> +++ b/drivers/hwmon/pmbus/pli1209bc.c
> @@ -8,6 +8,7 @@
>   #include <linux/i2c.h>
>   #include <linux/module.h>
>   #include <linux/pmbus.h>
> +#include <linux/regulator/driver.h>
>   #include "pmbus.h"
>   
>   /*
> @@ -32,11 +33,37 @@ static int pli1209bc_read_word_data(struct i2c_client *client, int page,
>   		if (data < 0)
>   			return data;
>   		return data * 10;
> +	/*
> +	 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 return invalid data
> +	 * when the BCM is turned off. Since it is not possible to return
> +	 * ENODATA error, return zero instead.
> +	 */
> +	case PMBUS_READ_VOUT:
> +	case PMBUS_READ_TEMPERATURE_1:
> +		data = pmbus_read_word_data(client, page, phase,
> +					    PMBUS_STATUS_WORD);
> +		if (data < 0)
> +			return data;
> +		if (data & PB_STATUS_POWER_GOOD_N)
> +			return 0L;

Why 0L ? The return value of pli1209bc_read_word_data() is int.

> +		return pmbus_read_word_data(client, page, phase, reg);
>   	default:
>   		return -ENODATA;
>   	}
>   }
>   
> +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> +static const struct regulator_desc pli1209bc_reg_desc = {
> +	.name = "vout2",
> +	.id = 1,
> +	.of_match = of_match_ptr("vout2"),
> +	.regulators_node = of_match_ptr("regulators"),
> +	.ops = &pmbus_regulator_ops,
> +	.type = REGULATOR_VOLTAGE,
> +	.owner = THIS_MODULE,
> +};
> +#endif
> +
>   static struct pmbus_driver_info pli1209bc_info = {
>   	.pages = 2,
>   	.format[PSC_VOLTAGE_IN] = direct,
> @@ -74,6 +101,10 @@ static struct pmbus_driver_info pli1209bc_info = {
>   	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
>   	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
>   	.read_word_data = pli1209bc_read_word_data,
> +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> +	.num_regulators = 1,
> +	.reg_desc = &pli1209bc_reg_desc,
> +#endif
>   };
>   
>   static int pli1209bc_probe(struct i2c_client *client)