linux-kernel - Re: [PATCH 2/6] Staging: iio: cdc: ad7152.c: Prefer using the BIT macro

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Date:	Thu, 10 Sep 2015 08:01:04 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Shraddha Barke <shraddha.6596@...il.com>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Peter Meerwald <pmeerw@...erw.net>,
	Hartmut Knaack <knaack.h@....de>, linux-kernel@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 2/6] Staging: iio: cdc: ad7152.c: Prefer using the BIT
 macro

On Thu, 10 Sep 2015, Shraddha Barke wrote:

> This patch replaces bit shifting on 1 with the BIT(x) macro
> as it's extensively used by other function in this driver.

Don't use BIT in the mixed cases.

julia

> 
> This was done with coccinelle:
> @@ int g; @@
> 
> -(1 << g)
> +BIT(g)
> 
> Signed-off-by: Shraddha Barke <shraddha.6596@...il.com>
> ---
>  drivers/staging/iio/cdc/ad7152.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/iio/cdc/ad7152.c b/drivers/staging/iio/cdc/ad7152.c
> index 87110d9..ba44c0e 100644
> --- a/drivers/staging/iio/cdc/ad7152.c
> +++ b/drivers/staging/iio/cdc/ad7152.c
> @@ -41,30 +41,30 @@
>  #define AD7152_REG_CFG2			26
>  
>  /* Status Register Bit Designations (AD7152_REG_STATUS) */
> -#define AD7152_STATUS_RDY1		(1 << 0)
> -#define AD7152_STATUS_RDY2		(1 << 1)
> -#define AD7152_STATUS_C1C2		(1 << 2)
> -#define AD7152_STATUS_PWDN		(1 << 7)
> +#define AD7152_STATUS_RDY1		BIT(0)
> +#define AD7152_STATUS_RDY2		BIT(1)
> +#define AD7152_STATUS_C1C2		BIT(2)
> +#define AD7152_STATUS_PWDN		BIT(7)
>  
>  /* Setup Register Bit Designations (AD7152_REG_CHx_SETUP) */
> -#define AD7152_SETUP_CAPDIFF		(1 << 5)
> +#define AD7152_SETUP_CAPDIFF		BIT(5)
>  #define AD7152_SETUP_RANGE_2pF		(0 << 6)
> -#define AD7152_SETUP_RANGE_0_5pF	(1 << 6)
> +#define AD7152_SETUP_RANGE_0_5pF	BIT(6)
>  #define AD7152_SETUP_RANGE_1pF		(2 << 6)
>  #define AD7152_SETUP_RANGE_4pF		(3 << 6)
>  #define AD7152_SETUP_RANGE(x)		((x) << 6)
>  
>  /* Config Register Bit Designations (AD7152_REG_CFG) */
> -#define AD7152_CONF_CH2EN		(1 << 3)
> -#define AD7152_CONF_CH1EN		(1 << 4)
> +#define AD7152_CONF_CH2EN		BIT(3)
> +#define AD7152_CONF_CH1EN		BIT(4)
>  #define AD7152_CONF_MODE_IDLE		(0 << 0)
> -#define AD7152_CONF_MODE_CONT_CONV	(1 << 0)
> +#define AD7152_CONF_MODE_CONT_CONV	BIT(0)
>  #define AD7152_CONF_MODE_SINGLE_CONV	(2 << 0)
>  #define AD7152_CONF_MODE_OFFS_CAL	(5 << 0)
>  #define AD7152_CONF_MODE_GAIN_CAL	(6 << 0)
>  
>  /* Capdac Register Bit Designations (AD7152_REG_CAPDAC_XXX) */
> -#define AD7152_CAPDAC_DACEN		(1 << 7)
> +#define AD7152_CAPDAC_DACEN		BIT(7)
>  #define AD7152_CAPDAC_DACP(x)		((x) & 0x1F)
>  
>  /* CFG2 Register Bit Designations (AD7152_REG_CFG2) */
> -- 
> 2.1.4
> 
> 
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