linux-kernel - Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted reg_se

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Message-ID: <20141121214005.GA4020@localhost.localdomain>
Date:	Fri, 21 Nov 2014 22:40:05 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Johannes Pointner <johannes.pointner@...il.com>
Cc:	Sekhar Nori <nsekhar@...com>, Vignesh R <vigneshr@...com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Felipe Balbi <balbi@...com>, Brad Griffis <bgriffis@...com>,
	Sanjeev Sharma <sanjeev_sharma@...tor.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-iio <linux-iio@...r.kernel.org>,
	linux-input@...r.kernel.org,
	Robert Nelson <robertcnelson@...il.com>
Subject: Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted
 reg_se_cache save

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
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