linux-kernel - Re: [PATCH 2/2] iio: adc: mcp320x: add triggered buffer support

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Message-ID: <20220828181539.12dfd21e@jic23-huawei>
Date:   Sun, 28 Aug 2022 18:15:39 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Vincent Whitchurch <vincent.whitchurch@...s.com>, kernel@...s.com,
        Lars-Peter Clausen <lars@...afoo.de>, axel.jonsson@...s.com,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] iio: adc: mcp320x: add triggered buffer support

On Thu, 25 Aug 2022 23:06:01 +0300
Andy Shevchenko <andy.shevchenko@...il.com> wrote:

> On Wed, Aug 24, 2022 at 1:46 PM Vincent Whitchurch
> <vincent.whitchurch@...s.com> wrote:
> >
> > From: Axel Jonsson <axel.jonsson@...s.com>
> >
> > Add support for triggered buffers.  Just read the channels in a loop to
> > keep things simple.  
> 
> ...
> 
> >  #include <linux/module.h>
> >  #include <linux/mod_devicetable.h>
> >  #include <linux/iio/iio.h>
> > +#include <linux/interrupt.h>  
> 
> Ordering?
> 
> But honestly, I prefer the linux/iio/* to be split in a separate group...
> 
> > +#include <linux/iio/buffer.h>
> > +#include <linux/iio/triggered_buffer.h>
> > +#include <linux/iio/trigger_consumer.h>
> >  #include <linux/regulator/consumer.h>
> >  
> 
> ...and be put here.
> 
> ...
> 
> > +       device_index = spi_get_device_id(adc->spi)->driver_data;  
> 
> Hmm... Wondering if this can be derived from channel number or alike.
> 
It is weirder than the name implies. 
Seem device_index is actually the chip type from amongst those the driver
supports.

That wants cleaning up, particularly there is also a chip_info structure.
Various ways of doing it, but simplest is probably a set of callbacks
covering the different data extraction methods in mcp320x_adc_conversion.

Jonathan