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SubjectRe: [PATCH 04/12] iio: adc: max9611: Fix misuse of GENMASK macro
Hi Joe, Jonathan,

On Sun, Jul 14, 2019 at 05:19:32AM -0700, Joe Perches wrote:
> On Sun, 2019-07-14 at 12:54 +0100, Jonathan Cameron wrote:
> > On Tue, 9 Jul 2019 22:04:17 -0700
> > Joe Perches <joe@perches.com> wrote:
> >
> > > Arguments are supposed to be ordered high then low.
> > >
> > > Signed-off-by: Joe Perches <joe@perches.com>
> >
> > Applied to the fixes-togreg branch of iio.git and marked for
> > stable etc.
>
> This mask is used in an init function called from a probe.
>
> I don't have this hardware but it looks as if it could
> never have worked so I doubt the driver and the hardware
> have ever been tested.
>

Ups, this is embarassing! Thanks for noticing

I actually tested the device before sending the driver of course

> Does anyone have this device in actual use?
>

The driver is currently in use in Renesas Gen3 Salvator boards:
arch/arm64/boot/dts/renesas/salvator-common.dtsi:466

I might need some time before I can actually test and tell what's
happening though. It might work by pure chance. Fortunately the mask
is only used for validation of the temperature reading at probe time,
and I can tell this passes (we would have noticed otherwise, Salvator
is one of the reference Gen3 platforms for upstream development).

As said I might need some time before I can test this, but the change
is indeed correct.

Thanks
j

>
> regval = ret & MAX9611_TEMP_MASK;
>
> if ((regval > MAX9611_TEMP_MAX_POS &&
> regval < MAX9611_TEMP_MIN_NEG) ||
> regval > MAX9611_TEMP_MAX_NEG) {
> dev_err(max9611->dev,
> "Invalid value received from ADC 0x%4x: aborting\n",
> regval);
> return -EIO;
> }
>
>
> > Thanks,
> >
> > Jonathan
> >
> > > ---
> > > drivers/iio/adc/max9611.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/iio/adc/max9611.c b/drivers/iio/adc/max9611.c
> > > index 917223d5ff5b..0e3c6529fc4c 100644
> > > --- a/drivers/iio/adc/max9611.c
> > > +++ b/drivers/iio/adc/max9611.c
> > > @@ -83,7 +83,7 @@
> > > #define MAX9611_TEMP_MAX_POS 0x7f80
> > > #define MAX9611_TEMP_MAX_NEG 0xff80
> > > #define MAX9611_TEMP_MIN_NEG 0xd980
> > > -#define MAX9611_TEMP_MASK GENMASK(7, 15)
> > > +#define MAX9611_TEMP_MASK GENMASK(15, 7)
> > > #define MAX9611_TEMP_SHIFT 0x07
> > > #define MAX9611_TEMP_RAW(_r) ((_r) >> MAX9611_TEMP_SHIFT)
> > > #define MAX9611_TEMP_SCALE_NUM 1000000
>
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