linux-kernel - Re: [PATCH v5 2/2] iio: (bma400) add driver for the BMA400

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Date:   Mon, 9 Dec 2019 18:11:53 +0000
From:   Dan Robertson <dan@...obertson.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        devicetree@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v5 2/2] iio: (bma400) add driver for the BMA400

On Sun, Dec 08, 2019 at 06:54:44PM -0800, Randy Dunlap wrote:
> On 12/8/19 5:43 PM, Dan Robertson wrote:
> > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > index d4ef35aeb579..dc9bc646d403 100644
> > --- a/drivers/iio/accel/Kconfig
> > +++ b/drivers/iio/accel/Kconfig
> > @@ -112,6 +112,22 @@ config BMA220
> >  	  To compile this driver as a module, choose M here: the
> >  	  module will be called bma220_spi.
> >  
> > +config BMA400
> > +	tristate "Bosch BMA400 3-Axis Accelerometer Driver"
> > +	select REGMAP
> > +	select BMA400_I2C if (I2C)
> 
> What's with the parentheses?  I see that there are roughly 2700
> "select ... if X" without parens and around 95 like
> "select ... if ("  [using rough grep expressions].
> The parens are unnecessary.  They are often used on complex
> expressions, but certainly not on simple ones (except in iio).

Good point. I'll remove it. I'll need the parentheses if/when SPI support is
added, but I'll add it when it is needed.

> > +	help
> > +	  Say Y here if you want to build a driver for the Bosch BMA400
> > +	  triaxial acceleration sensor.
> > +
> > +	  To compile this driver as a module, choose M here: the
> > +	  module will be called bma400_core and you will also get
> > +	  bma400_i2c for I2C.
> 
> iff I2C is set/enabled, so could be confusing.

Good catch.

Cheers,

 - Dan