linux-kernel - Re: [PATCH v4 3/3] hwmon: (lm75) Add regulator support

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Date:   Thu, 1 Oct 2020 11:13:01 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alban Bedel <alban.bedel@...q.com>, linux-hwmon@...r.kernel.org
Cc:     Jean Delvare <jdelvare@...e.com>, Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] hwmon: (lm75) Add regulator support

On 10/1/20 7:57 AM, Alban Bedel wrote:
> Add regulator support for boards where the sensor first need to be
> powered up before it can be used.
> 
> Signed-off-by: Alban Bedel <alban.bedel@...q.com>
> ---
> v2: Rely on dummy regulators instead of explicitly handling missing
>     regulator
> v3: Use a devm action to handle disabling the regulator
> ---

Second '---' is not needed.

I can not apply patches 1 and 2 of the series since I don't have an
Ack from a DT maintainer, but this one looks good. Applied.

Guenter


>  drivers/hwmon/lm75.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
> index ba0be48aeadd..e9c1f55b2706 100644
> --- a/drivers/hwmon/lm75.c
> +++ b/drivers/hwmon/lm75.c
> @@ -17,6 +17,7 @@
>  #include <linux/of.h>
>  #include <linux/regmap.h>
>  #include <linux/util_macros.h>
> +#include <linux/regulator/consumer.h>
>  #include "lm75.h"
>  
>  /*
> @@ -101,6 +102,7 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
>  struct lm75_data {
>  	struct i2c_client		*client;
>  	struct regmap			*regmap;
> +	struct regulator		*vs;
>  	u8				orig_conf;
>  	u8				current_conf;
>  	u8				resolution;	/* In bits, 9 to 16 */
> @@ -534,6 +536,13 @@ static const struct regmap_config lm75_regmap_config = {
>  	.use_single_write = true,
>  };
>  
> +static void lm75_disable_regulator(void *data)
> +{
> +	struct lm75_data *lm75 = data;
> +
> +	regulator_disable(lm75->vs);
> +}
> +
>  static void lm75_remove(void *data)
>  {
>  	struct lm75_data *lm75 = data;
> @@ -567,6 +576,10 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  	data->client = client;
>  	data->kind = kind;
>  
> +	data->vs = devm_regulator_get(dev, "vs");
> +	if (IS_ERR(data->vs))
> +		return PTR_ERR(data->vs);
> +
>  	data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config);
>  	if (IS_ERR(data->regmap))
>  		return PTR_ERR(data->regmap);
> @@ -581,6 +594,17 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  	data->sample_time = data->params->default_sample_time;
>  	data->resolution = data->params->default_resolution;
>  
> +	/* Enable the power */
> +	err = regulator_enable(data->vs);
> +	if (err) {
> +		dev_err(dev, "failed to enable regulator: %d\n", err);
> +		return err;
> +	}
> +
> +	err = devm_add_action_or_reset(dev, lm75_disable_regulator, data);
> +	if (err)
> +		return err;
> +
>  	/* Cache original configuration */
>  	status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
>  	if (status < 0) {
>