linux-kernel - Re: [PATCH v3 3/6] iio: accel: adxl345: Add spi-3wire option

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Date: Sun, 24 Mar 2024 19:59:39 +0100
From: Lothar Rubusch <l.rubusch@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: lars@...afoo.de, Michael.Hennerich@...log.com, robh+dt@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, eraretuya@...il.com
Subject: Re: [PATCH v3 3/6] iio: accel: adxl345: Add spi-3wire option

On Sun, Mar 24, 2024 at 2:32 PM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Sat, 23 Mar 2024 12:20:27 +0000
> Lothar Rubusch <l.rubusch@...il.com> wrote:
>
> > Add a setup function implementation to the spi module to enable
> > spi-3wire as option when specified in the device-tree.
> >
> > Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
> > ---
> >  drivers/iio/accel/adxl345.h     |  3 +++
> >  drivers/iio/accel/adxl345_spi.c | 12 +++++++++++-
> >  2 files changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/iio/accel/adxl345.h b/drivers/iio/accel/adxl345.h
> > index 3c1ded0c2..6b84a2cee 100644
> > --- a/drivers/iio/accel/adxl345.h
> > +++ b/drivers/iio/accel/adxl345.h
> > @@ -8,6 +8,9 @@
> >  #ifndef _ADXL345_H_
> >  #define _ADXL345_H_
> >
> > +#define ADXL345_REG_DATA_FORMAT              0x31
> > +#define ADXL345_DATA_FORMAT_SPI         BIT(6) /* spi-3wire */
> Name it that, rather than using a comment.   No need to precisely
> match datasheet naming - you are naming the value not the field here.
>
> ADXL345_DATA_FORMAT_SPI_3_WRITE perhaps?
>

Would you accept the following instead?
ADXL345_DATA_FORMAT_SPI_3WIRE

In the OF binding it is SPI_3WIRE. So, from this perspective I think it would
be consistent naming.

(...)