linux-kernel - Re: [PATCH v2] hwmon: (pmbus) lm25066: Add regulator support

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Date:   Sat, 19 Feb 2022 06:33:13 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Zev Weiss <zev@...ilderbeest.net>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: (pmbus) lm25066: Add regulator support

On Fri, Feb 18, 2022 at 04:07:42PM -0800, Zev Weiss wrote:
> While these chips aren't strictly advertised as voltage regulators per
> se, they (aside from the lm25056) support the PMBus OPERATION command
> to enable and disable their outputs and have status bits for reporting
> various warnings and faults, and can hence usefully support all the
> pmbus_regulator_ops operations.
> 
> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>

Applied to hwmon-next.

Thanks,
Guenter

> ---
> 
> Changes since v1 [0]:
>  - split out of power-efuse driver series
> 
> [0] https://lore.kernel.org/openbmc/20220217104444.7695-3-zev@bewilderbeest.net/
> 
>  drivers/hwmon/pmbus/Kconfig   |  7 +++++++
>  drivers/hwmon/pmbus/lm25066.c | 14 ++++++++++++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index c96f7b7338bd..c73aa50c7615 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -174,6 +174,13 @@ config SENSORS_LM25066
>  	  This driver can also be built as a module. If so, the module will
>  	  be called lm25066.
>  
> +config SENSORS_LM25066_REGULATOR
> +	bool "Regulator support for LM25066 and compatibles"
> +	depends on SENSORS_LM25066 && REGULATOR
> +	help
> +	  If you say yes here you get regulator support for National
> +	  Semiconductor LM25066, LM5064, and LM5066.
> +
>  config SENSORS_LTC2978
>  	tristate "Linear Technologies LTC2978 and compatibles"
>  	help
> diff --git a/drivers/hwmon/pmbus/lm25066.c b/drivers/hwmon/pmbus/lm25066.c
> index 8402b41520eb..09792cd03d9f 100644
> --- a/drivers/hwmon/pmbus/lm25066.c
> +++ b/drivers/hwmon/pmbus/lm25066.c
> @@ -435,6 +435,12 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
>  	return ret;
>  }
>  
> +#if IS_ENABLED(CONFIG_SENSORS_LM25066_REGULATOR)
> +static const struct regulator_desc lm25066_reg_desc[] = {
> +	PMBUS_REGULATOR("vout", 0),
> +};
> +#endif
> +
>  static const struct i2c_device_id lm25066_id[] = {
>  	{"lm25056", lm25056},
>  	{"lm25066", lm25066},
> @@ -545,6 +551,14 @@ static int lm25066_probe(struct i2c_client *client)
>  	info->m[PSC_CURRENT_IN] = info->m[PSC_CURRENT_IN] * shunt / 1000;
>  	info->m[PSC_POWER] = info->m[PSC_POWER] * shunt / 1000;
>  
> +#if IS_ENABLED(CONFIG_SENSORS_LM25066_REGULATOR)
> +	/* LM25056 doesn't support OPERATION */
> +	if (data->id != lm25056) {
> +		info->num_regulators = ARRAY_SIZE(lm25066_reg_desc);
> +		info->reg_desc = lm25066_reg_desc;
> +	}
> +#endif
> +
>  	return pmbus_do_probe(client, info);
>  }
>