arm/dt: backlight: Add ti lm3697 backlight ic configs

Porting of (CR)

arm/dt:
Add ti lm3697 backlight ic configs.

Change-Id: Ie26b0a743008b1688be1867d316911c9c2292d24
Signed-off-by: wangyq13 <wangyq13@lenovo.com>
Reviewed-on: https://gerrit.mot.com/1954961
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Ying Xu <xuying9@motorola.com>
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Submit-Approved: Jira Key
Signed-off-by: Robert Cabral <robertc@motorola.com>
Reviewed-on: https://gerrit.mot.com/1964498

qcom/bengal-leds-lm3697.dtsi

@@ -0,0 +1,35 @@
+/* Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+&qupv3_se1_i2c {
+	status = "ok"
+
+	lm3697-bl@37 {
+		compatible = "ti,lm3697";
+		reg = <0x37>;
+
+		enable-gpios = <&pmi632_gpios 6 0>;
+		backlight {
+			compatible = "ti,lm3697-backlight";
+			lcd {
+				led-sources = <0 1 2>;
+				ramp-up-msec = <200>;
+				ramp-down-msec = <200>;
+				pwm-period = <0>;
+				default-brightness-level = <255>;
+			};
+		};
+		fault-monitor {
+			compatible = "ti,lm3697-fault-monitor";
+		};
+	};
+};