linux-kernel - Re: [PATCH v2 1/4] iio: adc: ad7923: Remove the unused defines

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Date:   Sun, 15 Dec 2019 15:47:30 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>,
        "lkcamp@...ts.libreplanetbr.org" <lkcamp@...ts.libreplanetbr.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "djunho@...il.com" <djunho@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "lars@...afoo.de" <lars@...afoo.de>
Subject: Re: [PATCH v2 1/4] iio: adc: ad7923: Remove the unused defines

On Wed, 11 Dec 2019 07:26:07 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:

> On Tue, 2019-12-10 at 12:08 -0300, Daniel Junho wrote:
> > [External]
> > 
> > Removes the unused define AD7923_CHANNEL_x from the code.
> > 
> > Signed-off-by: Daniel Junho <djunho@...il.com>
> > ---
> >  drivers/iio/adc/ad7923.c | 4 ----
> >  1 file changed, 4 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
> > index 3212eb4c0f25..969c06b7d2b7 100644
> > --- a/drivers/iio/adc/ad7923.c
> > +++ b/drivers/iio/adc/ad7923.c
> > @@ -29,10 +29,6 @@
> >  #define AD7923_PM_MODE_AS	(1)		/* auto shutdown */
> >  #define AD7923_PM_MODE_FS	(2)		/* full shutdown */
> >  #define AD7923_PM_MODE_OPS	(3)		/* normal operation */
> > -#define AD7923_CHANNEL_0	(0)		/* analog input 0 */
> > -#define AD7923_CHANNEL_1	(1)		/* analog input 1 */
> > -#define AD7923_CHANNEL_2	(2)		/* analog input 2 */
> > -#define AD7923_CHANNEL_3	(3)		/* analog input 3 */  
> 
> The fact that is not used, is not a problem really.
> This can serve as a "shortcut" for the datasheet.

In some cases I would agree, but here adding a definition to go from
a channel number in text to an actual number doesn't add anything.

If there mapping was more complex then it would be reasonable to have
defines, but here I can't see the point.

So let's keep the patch to drop them.  I'll pick it up whilst the
comments on patch 4 have been addressed.

Thanks,

Jonathan


> 
> We can leave this as-is [1], or remove it as you do [2], or an alternative
> would be [3]:
> #define AD7923_CHANNEL(x)      (x)       /* analog channel input */
> 
> I don't mind either of these 3 versions ([1], [2] or [3]).
> 
> I'll leave it to Jonathan's preference.
> 
> >  #define AD7923_SEQUENCE_OFF	(0)		/* no sequence fonction
> > */
> >  #define AD7923_SEQUENCE_PROTECT	(2)		/* no interrupt
> > write cycle */
> >  #define AD7923_SEQUENCE_ON	(3)		/* continuous sequence */