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| author | Petr Cvek <petr.cvek@tul.cz> | 2017-03-13 09:05:49 +0100 |
|---|---|---|
| committer | Robert Jarzmik <robert.jarzmik@free.fr> | 2017-06-14 08:32:21 +0200 |
| commit | 7ade445c26269d5af6c34ee50be97d54a3992d02 (patch) | |
| tree | d95f31a5ea302a4d014d104270b1d05a2ee3a5f6 /arch/arm/mach-versatile | |
| parent | 2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff) | |
| download | talos-obmc-linux-7ade445c26269d5af6c34ee50be97d54a3992d02.tar.gz talos-obmc-linux-7ade445c26269d5af6c34ee50be97d54a3992d02.zip | |
ARM: pxa: magician: Add support for ADS7846 touchscreen
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 <petr.cvek@tul.cz>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Diffstat (limited to 'arch/arm/mach-versatile')
0 files changed, 0 insertions, 0 deletions
