linux-kernel - Re: [PATCH 3/5] iio: pressure: bmp280: Rearrange vars in reverse xmas tree order

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Date:   Mon, 16 Oct 2023 09:40:18 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Angel Iglesias <ang.iglesiasg@...il.com>
Cc:     linux-iio@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>,
        linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 3/5] iio: pressure: bmp280: Rearrange vars in reverse
 xmas tree order

On Sun, 15 Oct 2023 17:16:25 +0200
Angel Iglesias <ang.iglesiasg@...il.com> wrote:

> Small cleanup reordering local variable declarations following reverse
> christmas tree convention.
> 
> Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.com>
> 
> diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
> index 6089f3f9d8f4..ea02a623bb58 100644
> --- a/drivers/iio/pressure/bmp280-core.c
> +++ b/drivers/iio/pressure/bmp280-core.c
> @@ -766,8 +766,8 @@ static const struct iio_info bmp280_info = {
>  
>  static int bmp280_chip_config(struct bmp280_data *data)
>  {
> -	u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) |
> -		  FIELD_PREP(BMP280_OSRS_PRESS_MASK, data->oversampling_press + 1);
> +	u8 osrs = FIELD_PREP(BMP280_OSRS_PRESS_MASK, data->oversampling_press + 1) |
> +		  FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1);

For fields within a register, don't bother.
Normally the order is dictated by someone reading the fields on a datasheet.  
Feels like reorganzing them is just noise to me.

The rest look like good little tidy ups to me.

>  	int ret;
>  
>  	ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,
> diff --git a/drivers/iio/pressure/bmp280-i2c.c b/drivers/iio/pressure/bmp280-i2c.c
> index b3e069730f97..34e3bc758493 100644
> --- a/drivers/iio/pressure/bmp280-i2c.c
> +++ b/drivers/iio/pressure/bmp280-i2c.c
> @@ -7,9 +7,9 @@
>  
>  static int bmp280_i2c_probe(struct i2c_client *client)
>  {
> -	struct regmap *regmap;
> -	const struct bmp280_chip_info *chip_info;
>  	const struct i2c_device_id *id = i2c_client_get_device_id(client);
> +	const struct bmp280_chip_info *chip_info;
> +	struct regmap *regmap;
>  
>  	chip_info = i2c_get_match_data(client);
>  
> diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
> index 2eed483a8cc4..433d6fac83c4 100644
> --- a/drivers/iio/pressure/bmp280-spi.c
> +++ b/drivers/iio/pressure/bmp280-spi.c
> @@ -14,8 +14,7 @@
>  static int bmp280_regmap_spi_write(void *context, const void *data,
>                                     size_t count)
>  {
> -	struct device *dev = context;
> -	struct spi_device *spi = to_spi_device(dev);
> +	struct spi_device *spi = to_spi_device(context);
>  	u8 buf[2];
>  
>  	memcpy(buf, data, 2);
> @@ -31,8 +30,7 @@ static int bmp280_regmap_spi_write(void *context, const void *data,
>  static int bmp280_regmap_spi_read(void *context, const void *reg,
>                                    size_t reg_size, void *val, size_t val_size)
>  {
> -	struct device *dev = context;
> -	struct spi_device *spi = to_spi_device(dev);
> +	struct spi_device *spi = to_spi_device(context);
>  
>  	return spi_write_then_read(spi, reg, reg_size, val, val_size);
>  }