linux-kernel - Re: [PATCH v4 4/9] staging:iio:ad7780: add chip ID values and mask

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Date:   Sun, 3 Mar 2019 14:53:47 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Renato Lui Geh <renatogeh@...il.com>
Cc:     "Ardelean, Alexandru" <Alex.Ardelean@...log.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "giuliano.belinassi@....br" <giuliano.belinassi@....br>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "kernel-usp@...glegroups.com" <kernel-usp@...glegroups.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 4/9] staging:iio:ad7780: add chip ID values and mask

On Sun, 3 Mar 2019 11:01:09 -0300
Renato Lui Geh <renatogeh@...il.com> wrote:

> On 03/01, Ardelean, Alexandru wrote:
> >On Thu, 2019-02-28 at 11:24 -0300, Renato Lui Geh wrote:  
> >>
> >>
> >> The ad7780 supports both the ad778x and ad717x families. Each chip has
> >> a corresponding ID. This patch provides a mask for extracting ID values
> >> from the status bits and also macros for the correct values for the
> >> ad7170, ad7171, ad7780 and ad7781.
> >>
> >> Signed-off-by: Renato Lui Geh <renatogeh@...il.com>
> >> ---
> >>  drivers/staging/iio/adc/ad7780.c | 8 ++++++--
> >>  1 file changed, 6 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/staging/iio/adc/ad7780.c
> >> b/drivers/staging/iio/adc/ad7780.c
> >> index 56c49e28f432..ad7617a3a141 100644
> >> --- a/drivers/staging/iio/adc/ad7780.c
> >> +++ b/drivers/staging/iio/adc/ad7780.c
> >> @@ -26,10 +26,14 @@
> >>  #define AD7780_RDY             BIT(7)
> >>  #define AD7780_FILTER          BIT(6)
> >>  #define AD7780_ERR             BIT(5)
> >> -#define AD7780_ID1             BIT(4)
> >> -#define AD7780_ID0             BIT(3)
> >>  #define AD7780_GAIN            BIT(2)
> >>
> >> +#define AD7170_ID              0
> >> +#define AD7171_ID              1
> >> +#define AD7780_ID              1
> >> +#define AD7781_ID              0
> >> +
> >> +#define AD7780_ID_MASK         (BIT(3) | BIT(4))  
> >
> >This also doesn't have any functionality change.
> >The AD7170_ID, AD7171_ID, AD7780_ID & AD7781_ID IDs are also unused (maybe
> >in a later patch they are ?).  
> 
> They aren't. I added them following a previous review suggestion. Should
> I remove them?

Can we check them?  It's always useful to confirm that the device is
the one you think it is.  Then we can either use what is there
with a suitable warning, or if that is tricky just fault out as the
dt is giving us the wrong part number.

J

> >
> >I would also leave the AD7780_ID1 & AD7780_ID0 definitions in place, since
> >they're easier matched with the datasheet.
> >  
> >>
> >>  #define AD7780_PATTERN_GOOD    1
> >>  #define AD7780_PATTERN_MASK    GENMASK(1, 0)
> >> --
> >> 2.21.0
> >>