linux-kernel - Re: [PATCH 0/4] staging: iio: ad7150: improve driver readability

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Date:   Tue, 7 May 2019 17:35:43 -0300
From:   Melissa Wen <melissa.srw@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Alexandru Ardelean <ardeleanalex@...il.com>,
        Melissa Wen <melissa.srw@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Barry Song <21cnbao@...il.com>, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>,
        kernel-usp@...glegroups.com
Subject: Re: [PATCH 0/4] staging: iio: ad7150: improve driver readability

On 05/05, Jonathan Cameron wrote:
> On Sat, 4 May 2019 14:12:22 +0300
> Alexandru Ardelean <ardeleanalex@...il.com> wrote:
> 
> > On Sat, May 4, 2019 at 1:24 AM Melissa Wen <melissa.srw@...il.com> wrote:
> > >
> > > This patchset solves readability issues in AD7150 code, such as clarify
> > > register and mask definition, fashion improvement of mask uses, reduce
> > > tedious operation and useless comments.
> > >  
> > 
> > Hey,
> > 
> > Two patches seem a bit noisy/un-needed.
> > The other 2 are fine from me.
> > 
> > This driver does need some work to move it out of staging.
> > I am not sure what would be a big blocker for it, other than maybe it
> > needs a device-tree binding doc (in YAML format).
> > Maybe Jonathan remembers.
> > 
> > Some other low-hanging-fruit ideas would be:
> > 1) remove the code for platform_data ; that one seems forgotten from
> > some other time; the interrupts should be coming from device-tree,
> > from the i2c bindings
> > 2) you could do a AD7150_EVENT_SPEC() macro (similar to
> > AD7150_TIMEOUT() macro) and use it in the ad7150_events[] list; that
> > would reduce a few lines
> > 3) similar to 2), you could do a AD7150_CHANNEL(x) macro ;
> > 4) in ad7150_event_handler() the checks could be wrapped into a macro,
> > or maybe some function ; i am referring to "(int_status &
> > AD7150_STATUS_OUT1) && (chip->old_state & AD7150_STATUS_OUT1)" checks
> > ; those seem to be repeated
> > 5) add of_match_table to the driver
> > 
> > I (now) suspect that the reason this driver is still in staging is this comment:
> > /* Timeouts not currently handled by core */
> > 
> > I wonder if things changed since then ?
> > If not, it would be interesting to implement it in core.
> Hmm. Timeouts are 'unusual' to put it lightly.
> I'm thinking the ABI needs to perhaps be more specific but not sure what
> a good naming is.
> 
> Otherwise, I just took a quick look and can't see anything much else
> that needs doing.  Obviously something might come up in a thorough
> review prior to moving it though!
> 
> Jonathan
> > 
> > Thanks
> > Alex
> > 

Hi Alexandru and Jonathan,

Thank you for your help! Soon I will send a v2 with the fixes pointed out.
I'm also including the ideas above in the work plan for this driver.

P.s.: Sorry for having previously sent an email with HTML.

Melissa
> > 
> > > Melissa Wen (4):
> > >   staging: iio: ad7150: organize registers definition
> > >   staging: iio: ad7150: use FIELD_GET and GENMASK
> > >   staging: iio: ad7150: simplify i2c SMBus return treatment
> > >   staging: iio: ad7150: clean up of comments
> > >
> > >  drivers/staging/iio/cdc/ad7150.c | 102 ++++++++++++++-----------------
> > >  1 file changed, 47 insertions(+), 55 deletions(-)
> > >
> > > --
> > > 2.20.1
> > >  
>