linux-kernel - Re: [PATCH v4 04/11] iio: accel: adxl313: add function to enable measurement

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Message-ID: <20250608162738.407c7d20@jic23-huawei>
Date: Sun, 8 Jun 2025 16:27:38 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Lothar Rubusch <l.rubusch@...il.com>
Cc: dlechner@...libre.com, nuno.sa@...log.com, andy@...nel.org,
 corbet@....net, lucas.p.stankus@...il.com, lars@...afoo.de,
 Michael.Hennerich@...log.com, bagasdotme@...il.com,
 linux-iio@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 04/11] iio: accel: adxl313: add function to enable
 measurement

On Sun,  1 Jun 2025 17:21:32 +0000
Lothar Rubusch <l.rubusch@...il.com> wrote:

> Rework controlling measurement and standby of the sensor. Therefore,
> replace writing the register directly by encapsulating this and dealing
> with the return value in a separte function to enable and disable
> measurement. This will help to avoid redundant code in all locations
> where the sensor configuration needs to be adjusted, thus measurement will
> be set to standby, in follow up patches.
> 
> Further, reduce the control mask to only the measurement bit. The sleep bit
> actually controls a different behavior (not just putting the sensor to
> standby for configuration, but turning it into sleep mode) and it is not
> used so far. In consequence, there is no need to cover sleep bit and
> measurement with the same mask.
> 
> Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
This is a good bit to have as a precursor patch (as you have done)
because it is refactoring the existing code.  It doesn't stand on it's
own though given for now there is only one caller, so I won't pick it up
until the patch that uses it is ready to go.

Jonathan

> ---
>  drivers/iio/accel/adxl313.h      |  3 +--
>  drivers/iio/accel/adxl313_core.c | 10 +++++++---
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/accel/adxl313.h b/drivers/iio/accel/adxl313.h
> index fc937bdf83b6..9bf2facdbf87 100644
> --- a/drivers/iio/accel/adxl313.h
> +++ b/drivers/iio/accel/adxl313.h
> @@ -36,8 +36,7 @@
>  #define ADXL313_RATE_MSK		GENMASK(3, 0)
>  #define ADXL313_RATE_BASE		6
>  
> -#define ADXL313_POWER_CTL_MSK		GENMASK(3, 2)
> -#define ADXL313_MEASUREMENT_MODE	BIT(3)
> +#define ADXL313_POWER_CTL_MSK		BIT(3)
>  
>  #define ADXL313_RANGE_MSK		GENMASK(1, 0)
>  #define ADXL313_RANGE_MAX		3
> diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
> index 0c893c286017..6170c9daa30f 100644
> --- a/drivers/iio/accel/adxl313_core.c
> +++ b/drivers/iio/accel/adxl313_core.c
> @@ -63,6 +63,12 @@ bool adxl313_is_volatile_reg(struct device *dev, unsigned int reg)
>  }
>  EXPORT_SYMBOL_NS_GPL(adxl313_is_volatile_reg, "IIO_ADXL313");
>  
> +static int adxl313_set_measure_en(struct adxl313_data *data, bool en)
> +{
> +	return regmap_assign_bits(data->regmap, ADXL313_REG_POWER_CTL,
> +				  ADXL313_POWER_CTL_MSK, en);
> +}
> +
>  static int adxl312_check_id(struct device *dev,
>  			    struct adxl313_data *data)
>  {
> @@ -410,9 +416,7 @@ static int adxl313_setup(struct device *dev, struct adxl313_data *data,
>  	}
>  
>  	/* Enables measurement mode */
> -	return regmap_update_bits(data->regmap, ADXL313_REG_POWER_CTL,
> -				  ADXL313_POWER_CTL_MSK,
> -				  ADXL313_MEASUREMENT_MODE);
> +	return adxl313_set_measure_en(data, true);
>  }
>  
>  /**