linux-kernel - Re: [PATCH v3 4/4] iio: accel: adxl345: Add SPI support

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Date:   Fri, 24 Feb 2017 17:12:33 +0800
From:   Eva Rachel Retuya <eraretuya@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Daniel Baluta <daniel.baluta@...il.com>,
        Alison Schofield <amsfield22@...il.com>,
        Florian Vaussard <florian.vaussard@...g-vd.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] iio: accel: adxl345: Add SPI support

On Thu, Feb 23, 2017 at 06:58:12PM +0200, Andy Shevchenko wrote:
> On Thu, Feb 23, 2017 at 6:47 PM, Lars-Peter Clausen <lars@...afoo.de> wrote:
> > On 02/23/2017 05:43 PM, Andy Shevchenko wrote:
> >> On Wed, Feb 22, 2017 at 12:23 PM, Eva Rachel Retuya <eraretuya@...il.com> wrote:
> >>> Add SPI driver that initializes SPI regmap for the adxl345 core driver.
> >>> The driver supports the same functionality as I2C namely the x, y, z and
> >>> scale readings.
> 
> >>>  config ADXL345_I2C
> >>>         tristate
> >>>         select REGMAP_I2C
> >>>
> >>> +config ADXL345_SPI
> >>> +       tristate
> >>> +       select REGMAP_SPI
> >>
> >> Hmm...
> >> I saw another pattern
> >>
> >> Library / core part is non-visible to user, while
> >> SPI and I2C parts are selectable by user.
> >>
> >> Why do you use inverted pattern? What did I miss?
> >
> > The first version of the patch used the other pattern SPI/I2C visible.
> > Jonathan suggested this other pattern. I prefer the explicit SPI/I2C visible
> > pattern, but in the end it doesn't really matter as long as both work.
> 
> Yes, but this pattern makes extra footprint of the kernel and
> basically dead code when I would like, for example, to have SPI bus
> enabled, I2C module available, but SPI module not compiled.
> 
> Other one is when I want to have one compiled in, one as a module by
> whatever reason.
> 
> At the end I have no strong opinion, though rationale for the opposite is above.
> 

Hello Lars and Andy,

I'll revert to the explicit SPI/I2C pattern in order to give more
freedom in configuring as per the scenarios previously stated.

Thanks,
Eva

> -- 
> With Best Regards,
> Andy Shevchenko