linux-kernel - Re: [PATCH v2 1/3] w1: ds2482: Add regulator support

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Message-ID: <2ff7omfp752zdtzozcle5jn7nsyonsbqgjefrx5t4lncoer5bw@wb76uxg26ugg>
Date: Sat, 23 Nov 2024 17:32:14 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kryštof Černý <cleverline1mc@...il.com>
Cc: Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Stefan Wahren <stefan.wahren@...rgebyte.com>, Ben Gardner <bgardner@...tec.com>, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/3] w1: ds2482: Add regulator support

On Fri, Nov 22, 2024 at 09:53:57AM +0100, Kryštof Černý wrote:
> Adds a support for attaching a supply regulator.
> 
> Signed-off-by: Kryštof Černý <cleverline1mc@...il.com>
> ---
>  drivers/w1/masters/ds2482.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c
> index a2ecbb863c57f38bffc8e3cd463db1940e603179..3fb35e92fc1587dc4e609c0061fa5057e0027a80 100644
> --- a/drivers/w1/masters/ds2482.c
> +++ b/drivers/w1/masters/ds2482.c
> @@ -15,6 +15,7 @@
>  #include <linux/slab.h>
>  #include <linux/i2c.h>
>  #include <linux/delay.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <linux/w1.h>
>  
> @@ -117,6 +118,9 @@ struct ds2482_data {
>  	u8			channel;
>  	u8			read_prt;	/* see DS2482_PTR_CODE_xxx */
>  	u8			reg_config;
> +
> +	/* reference to the optional regulator */

Drop comment, obvious.

> +	struct regulator *vcc_reg;

Missing indentation after type - see earlier lines.

>  };
>  
>  
> @@ -445,6 +449,7 @@ static int ds2482_probe(struct i2c_client *client)
>  	int err = -ENODEV;
>  	int temp1;
>  	int idx;
> +	int ret;
>  
>  	if (!i2c_check_functionality(client->adapter,
>  				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
> @@ -457,6 +462,18 @@ static int ds2482_probe(struct i2c_client *client)
>  		goto exit;
>  	}
>  
> +	/* Get the vcc regulator */
> +	data->vcc_reg = devm_regulator_get(&client->dev, "vcc");
> +	if (IS_ERR(data->vcc_reg))
> +		return PTR_ERR(data->vcc_reg);
> +
> +	/* Enable the vcc regulator */
> +	ret = regulator_enable(data->vcc_reg);

You wanted devm_regulator_get_enable().

... but your comment also suggests devm_regulator_get_enable_optional().


Best regards,
Krzysztof