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SubjectRe: [PATCH 05/11] staging: iio: ad7746: Remove unused defines
On Wed, 21 Mar 2018 11:28:53 -0300
Hernán Gonzalez <hernan@vanguardiasur.com.ar> wrote:

> Signed-off-by: Hernán Gonzalez <hernan@vanguardiasur.com.ar>
Hmm. This sort of patch is always a trade off between
clearing out unused code and the fact that the defines
sometimes provide useful information even when not
actually used.

> ---
> drivers/staging/iio/cdc/ad7746.c | 16 ----------------
> drivers/staging/iio/cdc/ad7746.h | 5 -----
> 2 files changed, 21 deletions(-)
>
> diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
> index 57623db..cba8cd1 100644
> --- a/drivers/staging/iio/cdc/ad7746.c
> +++ b/drivers/staging/iio/cdc/ad7746.c
> @@ -25,7 +25,6 @@
> * AD7746 Register Definition
> */
>
> -#define AD7746_REG_STATUS 0
> #define AD7746_REG_CAP_DATA_HIGH 1
> #define AD7746_REG_VT_DATA_HIGH 4
> #define AD7746_REG_CAP_SETUP 7
> @@ -38,17 +37,10 @@
> #define AD7746_REG_CAP_GAINH 15
> #define AD7746_REG_VOLT_GAINH 17
>
> -/* Status Register Bit Designations (AD7746_REG_STATUS) */
> -#define AD7746_STATUS_EXCERR BIT(3)
> -#define AD7746_STATUS_RDY BIT(2)
> -#define AD7746_STATUS_RDYVT BIT(1)
> -#define AD7746_STATUS_RDYCAP BIT(0)
> -
Hmm. My gut feeling is the driver really should be reading this
register... Ah well. Perhaps it can go in the meantime.

> /* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
> #define AD7746_CAPSETUP_CAPEN BIT(7)
> #define AD7746_CAPSETUP_CIN2 BIT(6) /* AD7746 only */
> #define AD7746_CAPSETUP_CAPDIFF BIT(5)
> -#define AD7746_CAPSETUP_CACHOP BIT(0)
Don't remove definitions of 'parts' of a register.
It is odd to only have some parts described.

>
> /* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
> #define AD7746_VTSETUP_VTEN (1 << 7)
> @@ -56,13 +48,8 @@
> #define AD7746_VTSETUP_VTMD_EXT_TEMP (1 << 5)
> #define AD7746_VTSETUP_VTMD_VDD_MON (2 << 5)
> #define AD7746_VTSETUP_VTMD_EXT_VIN (3 << 5)
> -#define AD7746_VTSETUP_EXTREF BIT(4)
> -#define AD7746_VTSETUP_VTSHORT BIT(1)
> -#define AD7746_VTSETUP_VTCHOP BIT(0)
Same comment, keep these as odd to not know if the rest of the register
is used etc...
>
> /* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
> -#define AD7746_EXCSETUP_CLKCTRL BIT(7)
> -#define AD7746_EXCSETUP_EXCON BIT(6)
> #define AD7746_EXCSETUP_EXCB BIT(5)
> #define AD7746_EXCSETUP_NEXCB BIT(4)
> #define AD7746_EXCSETUP_EXCA BIT(3)
> @@ -74,10 +61,7 @@
> #define AD7746_CONF_CAPFS_SHIFT 3
> #define AD7746_CONF_VTFS_MASK GENMASK(7, 6)
> #define AD7746_CONF_CAPFS_MASK GENMASK(5, 3)
> -#define AD7746_CONF_MODE_IDLE (0 << 0)
> -#define AD7746_CONF_MODE_CONT_CONV (1 << 0)
> #define AD7746_CONF_MODE_SINGLE_CONV (2 << 0)
> -#define AD7746_CONF_MODE_PWRDN (3 << 0)
This is really nasty. Some particular values may not be used
in the driver (and they should be - for example we should power
down on remove). Don't remove their definitions.
> #define AD7746_CONF_MODE_OFFS_CAL (5 << 0)
> #define AD7746_CONF_MODE_GAIN_CAL (6 << 0)
>
> diff --git a/drivers/staging/iio/cdc/ad7746.h b/drivers/staging/iio/cdc/ad7746.h
> index ea8572d..2fbcee8 100644
> --- a/drivers/staging/iio/cdc/ad7746.h
> +++ b/drivers/staging/iio/cdc/ad7746.h
> @@ -13,11 +13,6 @@
> * TODO: struct ad7746_platform_data needs to go into include/linux/iio
> */
>
> -#define AD7466_EXCLVL_0 0 /* +-VDD/8 */
> -#define AD7466_EXCLVL_1 1 /* +-VDD/4 */
> -#define AD7466_EXCLVL_2 2 /* +-VDD * 3/8 */
> -#define AD7466_EXCLVL_3 3 /* +-VDD/2 */
This is used... If you wanted to use the platform data you would
need these to fill it.

Jonathan
> -
> struct ad7746_platform_data {
> unsigned char exclvl; /*Excitation Voltage Level */
> bool exca_en; /* enables EXCA pin as the excitation output */

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