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From:   =?UTF-8?Q?Hern=C3=A1n_Gonzalez?= <hernan@vanguardiasur.com.ar>
Date:   Mon, 16 Apr 2018 11:50:20 -0300
Message-ID: <CALfa3vFmpU5VgO=g2hS1tCBsdZ4DgG_Xi8oq2N2RX-iL2HeYkA@mail.gmail.com>
Subject: Re: [PATCH v2 07/14] staging: iio: ad7746: Remove unused defines
To:     Jonathan Cameron <jic23@kernel.org>
Cc:     knaack.h@gmx.de, lars@metafoo.de,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        gregkh@linuxfoundation.org, Michael.Hennerich@analog.com,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
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You're right, got confused from the macro defined in the .c file. I'll
leave this alone on the next series
Thanks!

On Sun, Apr 15, 2018 at 12:12 PM, Jonathan Cameron <jic23@kernel.org> wrote=
:
> On Fri, 13 Apr 2018 13:36:44 -0300
> Hern=C3=A1n Gonzalez <hernan@vanguardiasur.com.ar> wrote:
>
>> Signed-off-by: Hern=C3=A1n Gonzalez <hernan@vanguardiasur.com.ar>
>> ---
>>  drivers/staging/iio/cdc/ad7746.c | 7 -------
>>  drivers/staging/iio/cdc/ad7746.h | 5 -----
>>  2 files changed, 12 deletions(-)
>>
>> diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/=
ad7746.c
>> index f53612a..d39ab34 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
>> @@ -38,12 +37,6 @@
>>  #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)
>> -
> There is a pretty strong argument that the driver 'should' be
> checking the status register...
>
> I would leave it the defines here.  When they are acting
> as 'documentation' of the register layout of a device, they
> do little harm and can be very useful.
>
>>  /* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_S=
ETUP) */
>>  #define AD7746_CAPSETUP_CAPEN                BIT(7)
>>  #define AD7746_CAPSETUP_CIN2         BIT(6) /* AD7746 only */
>> 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 */
>> -
>
> Think about what these are for.... They aren't unused
> if you are actually using platform data on a given oard.
>
>>  struct ad7746_platform_data {
>>       unsigned char exclvl;   /*Excitation Voltage Level */
>>       bool exca_en;           /* enables EXCA pin as the excitation outp=
ut */
>