From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Cochran <richardcochran@gmail.com>
Subject: Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted
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Date: Fri, 21 Nov 2014 22:40:05 +0100
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To: Johannes Pointner <johannes.pointner@gmail.com>
Cc: Sekhar Nori <nsekhar@ti.com>, Vignesh R <vigneshr@ti.com>, Dmitry Torokhov <dmitry.torokhov@gmail.com>, Lee Jones <lee.jones@linaro.org>, Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, Benoit Cousson <bcousson@baylibre.com>, Tony Lindgren <tony@atomide.com>, Russell King <linux@arm.linux.org.uk>, Jonathan Cameron <jic23@kernel.org>, Hartmut Knaack <knaack.h@gmx.de>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Lars-Peter Clausen <lars@metafoo.de>, Peter Meerwald <pmeerw@pmeerw.net>, Samuel Ortiz <sameo@linux.intel.com>, Felipe Balbi <balbi@ti.com>, Brad Griffis <bgriffis@ti.com>, Sanjeev Sharma <sanjeev_sharma@mentor.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Jan Kardell <jan.kardell@telliq.com>, devicetree@vger
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On Fri, Nov 21, 2014 at 07:17:18PM +0100, Johannes Pointner wrote:
> Before the patches were also jumps but I thought it is something
> Vignesh should know. Maybe there is some fix for that too?
> As Richard also noted, it would be nice if ti could let us know how to
> get the delay values right. By trial and error is IMHO not the best
> way.

That is not only an opinion, it is a matter of fact. TI really dropped
the ball on this one. I thought the patch series was a sign they
finally were going to properly address this issue. Wrong again.

The data sheet for the TI part used to have a reference to an app-note
for the touch controller.

      spruh73f page 1154

      The Pen IRQ can only occur if the correct Pen Ctrl bits are high
      (AFE Pen Ctrl bits 6:5 in the TSC_ADC control register) and if
      the correct ground transistor biasing is set in the StepConfig
      [N] Register. Refer to the application notes for the correct
      settings.

I searched high and low for this application note. Then, the data
sheet got revised.

Thanks,
Richard