Add 4-wire/5-wire touchscreen controller.

Signed-off-by: Ksenija Stanojevic <ksenija.stanoje...@gmail.com>
---
Changes in v7:
 - remove touch_ret variable in probe and use ret instead
 - make error check on of_property_read_u32 in probe

Changes in v6:
 - update copyright

Changes in v5:
 - add field void __iomem *base to struct mxs_lradc_adc
 - change arguments in all functions for accessing I/O memory
   to follow the previous change.
 - use devm_ioremap for mapping I/O memory

Changes in v4:
 - update copyright
 - use platform_get_irq_byname
 - use irq_of_parse_and_map

Changes in v3:
 - make buffer large enough for timestamps
 - remove unnecessary blank lines

Changes in v2:
 - improve commit message
 - do not change spacing in Kconfig
 - impove formating
 - remove wrapper show_scale_avail
 - use correct syntax for comments
 - use devm_iio_trigger_alloc
 - do not allocate buffer dynamically
 - use iio_device_claim_*_mode helpers
 - add spinlock in struct mxs_lradc_ts to enable locking in interrupt handler
 - only grab irqs that are relevant to adc
 - remove blank line at the end of the file
 - change licence to GPL
 - add copyright

 drivers/input/touchscreen/Kconfig  | 10 ++++++++++
 drivers/input/touchscreen/Makefile |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/input/touchscreen/Kconfig 
b/drivers/input/touchscreen/Kconfig
index 2fb1f43..49ea962 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -305,6 +305,16 @@ config TOUCHSCREEN_EGALAX_SERIAL
          To compile this driver as a module, choose M here: the
          module will be called egalax_ts_serial.
 
+config TOUCHSCREEN_MXS_LRADC
+       tristate "Freescale i.MX23/i.MX28 LRADC touchscreen"
+       depends on MFD_MXS_LRADC
+       help
+         Say Y here if you have a touchscreen connected to the low-resolution
+         analog-to-digital converter (LRADC) on an i.MX23 or i.MX28 processor.
+
+         To compile this driver as a module, choose M here: the module will be
+         called mxs-lradc-ts.
+
 config TOUCHSCREEN_FT6236
        tristate "FT6236 I2C touchscreen"
        depends on I2C
diff --git a/drivers/input/touchscreen/Makefile 
b/drivers/input/touchscreen/Makefile
index b4373d6..9f2b76b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_TOUCHSCREEN_MIGOR)               += migor_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MMS114)       += mms114.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH)       += mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712)                += mk712.o
+obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC)     += mxs-lradc-ts.o
 obj-$(CONFIG_TOUCHSCREEN_HP600)                += hp680_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_HP7XX)                += jornada720_ts.o
 obj-$(CONFIG_TOUCHSCREEN_IPAQ_MICRO)   += ipaq-micro-ts.o
-- 
1.9.1

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