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Input: add touchscreen support for TS-4800

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On this board, the touchscreen, an ads7843, is not handled directly by
Linux but by a companion FPGA. This FPGA is memory-mapped and the IP
design is very similar to the mk712.

This commit adds the support for this IP.

Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Damien Riegel
2015-12-16 11:49:14 -08:00
committed by Dmitry Torokhov
parent 6b0f8f9c52
commit 40e3be3933
4 changed files with 244 additions and 0 deletions
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11
Documentation/devicetree/bindings/input/touchscreen/ts4800-ts.txt Normal file
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* TS-4800 Touchscreen bindings
Required properties:
- compatible: must be "technologic,ts4800-ts"
- reg: physical base address of the controller and length of memory mapped
region.
- syscon: phandle / integers array that points to the syscon node which
describes the FPGA's syscon registers.
- phandle to FPGA's syscon
- offset to the touchscreen register
- offset to the touchscreen enable bit