linux-kernel - Re: [PATCH v2 0/3] iio: light: opt3001: Enable operation w/o IRQ

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Message-ID: <20160129180542.GD7960@LTA0797059A>
Date:	Fri, 29 Jan 2016 12:05:42 -0600
From:	Andreas Dannenberg <dannenberg@...com>
To:	Alexander Koch <mail@...xanderkoch.net>, <jic23@...nel.org>
CC:	<knaack.h@....de>, <lars@...afoo.de>, <pmeerw@...erw.net>,
	<mhornung.linux@...il.com>, <balbi@...com>,
	<fengguang.wu@...el.com>, <linux-iio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] iio: light: opt3001: Enable operation w/o IRQ

On Sat, Jan 16, 2016 at 05:14:35PM +0100, Alexander Koch wrote:
> This patch series aims at enabling IRQ-less operation for the TI OPT3001 light
> sensor.

Jon,
I was checking to see if the DT bindings have been updated to reflect
the interrupt-less operation however I can't seem to find it in the
Kernel tree. The last activity I can find is this one...

https://patchwork.ozlabs.org/patch/490819/

I guess it may have slipped through the cracks so I'm going to update
the bindings document and re-submit.

Regards,
Andreas

> 
> The current version of the driver requires an interrupt line to be connected to
> the INT pin of the sensor, through which the IIO framework gets notified about
> readout values being ready. In the datasheet this is described as optional (sec.
> 8.1.1).
> 
> In my use case of the OPT3001 I do not have any interrupt lines or GPIOs
> available to connect the INT pin to, so I have implemented an interrupt-less
> operation mode that simply sleeps for the specified worst-case readout time
> instead of waiting for the interrupt.
> 
> This change is transparent as interrupt-less operation mode is done only when no
> valid interrupt no. is configured via device tree.
> 
> Patches are taken against linux-next/master, tested by compilation,
> checkpatch.pl and by running on an embedded developer board (both IRQ-enabled
> and IRQ-less mode).
> 
> 
> Changes from v1:
> 
>  - use type bool for introduced member 'use_irq'
>  - include trivial refactoring step that changes the types of two other members
>    to bool, in order to match 'use_irq'
> 
> 
> Alexander Koch (3):
>   iio: light: opt3001: extract int. time constants
>   iio: light: opt3001: trivial type refactoring
>   iio: light: opt3001: enable operation w/o IRQ
> 
>  drivers/iio/light/opt3001.c | 156 ++++++++++++++++++++++++++++++--------------
>  1 file changed, 106 insertions(+), 50 deletions(-)
> 
> -- 
> 2.7.0
>