From: jbe@pengutronix.de (Jürgen Beisert)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv5] staging/iio/adc: change the MXS touchscreen driver implementation
Date: Mon, 23 Sep 2013 16:05:03 +0200 [thread overview]
Message-ID: <201309231605.03860.jbe@pengutronix.de> (raw)
In-Reply-To: <21056.17602.24566.144289@ipc1.ka-ro>
Hi Lothar,
On Monday 23 September 2013 15:40:18 Lothar Wa?mann wrote:
> J?rgen Beisert writes:
> > The i.MX28 manual says the LRADC delay unit is driven by a 2 kHz clock,
> > but does not say what kind of clock it is (or is derived from). I guess
> > now, this clock isn't enabled and thus the delay unit can't work. At
> > least on the MX28EVK. On your TX28 platform the clock seems enabled and
> > the delay unit can do its job and drive the state machine.
>
> The i.MX28 Ref Manual states in chapter 38.5.14 LRADC Scheduling Delay:
> | This counter operates on a 2KHz clock derived from crystal clock.
>
> Thus the clock should always be enabled.
But it isn't always on. I have now added the correct clock_get() call to the
LRADC driver and the touchscreen works again on the MX28EVK. New patch series
will follow. Same is required for i.MX23.
Regards,
Juergen
--
Pengutronix e.K. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?| Juergen Beisert ? ? ? ? ? ? |
Linux Solutions for Science and Industry ? ? ?| http://www.pengutronix.de/ |
next prev parent reply other threads:[~2013-09-23 14:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-19 12:22 [PATCHv5] staging/iio/adc: change the MXS touchscreen driver implementation Juergen Beisert
2013-09-19 12:22 ` [PATCH 1/7] Staging/iio/adc/touchscreen/MXS: distinguish i.MX23's and i.MX28's LRADC Juergen Beisert
2013-09-19 12:22 ` [PATCH 2/7] Staging/iio/adc/touchscreen/MXS: separate i.MX28 specific register bits Juergen Beisert
2013-09-19 12:22 ` [PATCH 3/7] Staging/iio/adc/touchscreen/MXS: simplify register access Juergen Beisert
2013-09-19 12:22 ` [PATCH 4/7] Staging/iio/adc/touchscreen/MXS: add i.MX23 support to the LRADC touchscreen driver Juergen Beisert
2013-09-19 12:22 ` [PATCH 5/7] Staging/iio/adc/touchscreen/MXS: add interrupt driven touch detection Juergen Beisert
2013-09-21 12:36 ` Jonathan Cameron
2013-09-19 12:22 ` [PATCH 6/7] Staging/iio/adc/touchscreen/MXS: Remove old touchscreen detection implementation Juergen Beisert
2013-09-19 12:22 ` [PATCH 7/7] Staging/iio/adc/touchscreen/MXS: provide devicetree adaption Juergen Beisert
2013-09-21 12:42 ` Jonathan Cameron
2013-09-23 7:42 ` Jürgen Beisert
2013-09-22 23:55 ` [PATCHv5] staging/iio/adc: change the MXS touchscreen driver implementation Marek Vasut
2013-09-23 7:55 ` Jürgen Beisert
2013-09-23 9:25 ` Lothar Waßmann
2013-09-23 10:35 ` Jürgen Beisert
2013-09-23 10:36 ` Marek Vasut
2013-09-23 11:57 ` Jürgen Beisert
2013-09-23 12:12 ` Lothar Waßmann
2013-09-23 13:24 ` Jürgen Beisert
2013-09-23 13:40 ` Lothar Waßmann
2013-09-23 14:05 ` Jürgen Beisert [this message]
2013-09-23 13:40 ` Jürgen Beisert
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