linux-kernel - Re: [PATCHv3 2/3] ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging

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Message-ID: <51D2DE5B.9060309@free-electrons.com>
Date:	Tue, 02 Jul 2013 16:06:19 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Fabio Estevam <festevam@...il.com>
CC:	Shawn Guo <shawn.guo@...aro.org>,
	Jonathan Cameron <jic23@....ac.uk>, brian@...stalfontz.com,
	linux-doc@...r.kernel.org, linux-iio@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org, jimwall@...om,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Landley <rob@...dley.net>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lucas Stach <l.stach@...gutronix.de>,
	Marek Vasut <marex@...x.de>
Subject: Re: [PATCHv3 2/3] ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging

On 02/07/2013 13:50, Alexandre Belloni wrote:
> On 02/07/2013 13:45, Fabio Estevam wrote:
> 
>> Shouldn't this be
>>
>>          i2c@1 {
>>                  reg = <1>; ?
>>
> 
> No, we have 4 devices on that mux and 2 pins to select the muxing.
> 

OK, got it working.

So, the results:

bitbanging:

# time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw
2637
real	0m 0.09s
user	0m 0.01s
sys	0m 0.01s


i2c-mxs PIO mode:

# time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw
[   35.007650] [sched_delayed] sched: RT throttling activated
2627
real	0m 7.14s
user	0m 0.02s
sys	0m 0.01s


i2c-mxs PIO mode without LRADC:

# time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw
[   18.007432] [sched_delayed] sched: RT throttling activated
2629
real	0m 7.09s
user	0m 0.00s
sys	0m 0.03s


i2c-mxs DMA mode:

# time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw
2631
real	0m 0.12s
user	0m 0.01s
sys	0m 0.01s


It seems fine for me.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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