input: ti_am33x_tsc: Order of TSC wires, made configurable

The current driver expected touchscreen input
wires(XP,XN,YP,YN) to be connected in a particular order.
Making changes to accept this as platform data.

Sebastian reworked the original patch and removed a lot of the not
required pieces.

Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/input/ti_am335x_tsc.h b/include/linux/input/ti_am335x_tsc.h
index 49269a2aa329..6a66b4d1ac2c 100644
--- a/include/linux/input/ti_am335x_tsc.h
+++ b/include/linux/input/ti_am335x_tsc.h
@@ -12,12 +12,24 @@
  *                      A step configured to read a single
  *                      co-ordinate value, can be applied
  *                      more number of times for better results.
+ * @wire_config:        Different EVM's could have a different order
+ *                      for connecting wires on touchscreen.
+ *                      We need to provide an 8 bit number where in
+ *                      the 1st four bits represent the analog lines
+ *                      and the next 4 bits represent positive/
+ *                      negative terminal on that input line.
+ *                      Notations to represent the input lines and
+ *                      terminals resoectively is as follows:
+ *                      AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
+ *                      XP  = 0, XN = 1, YP = 2, YN = 3.
+ *
  */
 
 struct tsc_data {
         int wires;
         int x_plate_resistance;
         int steps_to_configure;
+        int wire_config[10];
 };
 
 #endif