From mboxrd@z Thu Jan 1 00:00:00 1970 From: robert.jarzmik@free.fr (Robert Jarzmik) Date: Fri, 17 Mar 2017 08:14:43 +0100 Subject: [PATCH v3] ARM: pxa: magician: Add support for ADS7846 touchscreen In-Reply-To: (Petr Cvek's message of "Mon, 13 Mar 2017 09:05:49 +0100") References: Message-ID: <87wpbofk7w.fsf@belgarion.home> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Petr Cvek writes: > This patch adds a support for ADS7846 touchscreen driver. > > The basic functionality was tested, x_plate_ohms and y_plate_ohms were > physically measured. The value pressure_max was empirically set to match > the measured range, which is affected by x_plate_ohms and ADS samples. > > The value of keep_vref_on should be set. A tested model (T-Mobile MDA > Compact PM10A) doesn't seem to use Vref pin as the input from an external > source. On this model the unset keep_vref_on cause high jitter of measured > values. > > SPI framing pin (gpio_cs) must be used in GPIO mode due to an incompatible > autoframing of PXA27x controller and ADS7846 device. > > Signed-off-by: Petr Cvek Applied to pxa/for-next, unless Philipp objects in the next couple of days, thanks. Cheers. -- Robert