backlight: qcom-spmi-wled: Add support for QCOM SPMI WLED driver

qcom-spmi-wled driver adds support for controlling backlight for
LCD panels that uses QTI PMICs like pmi8998, PM8150L and PM6150L.

This snapshot is taken as of msm-4.14
commit 9bb584ae3a9d ("msm/sde/rotator: Add rev checks for sdmmagpie").

Change-Id: Ie2d3e1999cef12a83b301d9e838a7425e18ca9d7
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>

drivers/video/backlight/Kconfig

@@ -313,6 +313,16 @@ config BACKLIGHT_PM8941_WLED
 	  If you have the Qualcomm PM8941, say Y to enable a driver for the
 	  WLED block.
 
+config BACKLIGHT_QCOM_SPMI_WLED
+	tristate "Qualcomm Technologies, Inc. WLED Driver"
+	select REGMAP
+	help
+	  If you have the Qualcomm Technologies, Inc. WLED used for backlight
+	  control, say Y to enable a driver for the  WLED block. This driver
+	  provides the interface to the display driver to adjust the brightness
+	  of the display backlight. This supports PMI8998, PM8150L, PM6150L
+	  currently.
+
 config BACKLIGHT_SAHARA
 	tristate "Tabletkiosk Sahara Touch-iT Backlight Driver"
 	depends on X86

drivers/video/backlight/Makefile

@@ -52,6 +52,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_PM8941_WLED)	+= pm8941-wled.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
+obj-$(CONFIG_BACKLIGHT_QCOM_SPMI_WLED)	+= qcom-spmi-wled.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
 obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o