leds: Add dac124s085 driver

Add an LED driver using the DAC124S085 DAC from NatSemi

[randy.dunlap@oracle.com: use header files for interfaces]
Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 90d39e5..16a9408 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -190,6 +190,13 @@
 	  This option enables support for on-chip LED drivers found
 	  on Dialog Semiconductor DA9030/DA9034 PMICs.
 
+config LEDS_DAC124S085
+	tristate "LED Support for DAC124S085 SPI DAC"
+	depends on LEDS_CLASS && SPI
+	help
+	  This option enables support for DAC124S085 SPI DAC from NatSemi,
+	  which can be used to control up to four LEDs.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS