1 files changed, 150 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0289-overlays-Add-ltc294x-battery-gauge.patch b/target/linux/brcm2708/patches-4.14/950-0289-overlays-Add-ltc294x-battery-gauge.patch
new file mode 100644
index 0000000000..3195b04505
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.14/950-0289-overlays-Add-ltc294x-battery-gauge.patch
@@ -0,0 +1,150 @@
+From 585ea300fa44cdf3c3259af68c49518bb85e4af2 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Tue, 1 May 2018 09:35:56 +0100
+Subject: [PATCH 289/454] overlays: Add ltc294x (battery gauge)
+
+Support the LTC294x range of I2C-connected battery monitors.
+
+See: https://github.com/raspberrypi/linux/issues/2537
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ arch/arm/boot/dts/overlays/Makefile           |  1 +
+ arch/arm/boot/dts/overlays/README             | 25 ++++++
+ .../arm/boot/dts/overlays/ltc294x-overlay.dts | 86 +++++++++++++++++++
+ 3 files changed, 112 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/ltc294x-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -60,6 +60,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
+ 	justboom-dac.dtbo \
+ 	justboom-digi.dtbo \
+ 	lirc-rpi.dtbo \
++	ltc294x.dtbo \
+ 	mbed-dac.dtbo \
+ 	mcp23017.dtbo \
+ 	mcp23s17.dtbo \
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -1020,6 +1020,31 @@ Params: gpio_out_pin            GPIO for
+                                 (default "off")
+ 
+ 
++Name:   ltc294x
++Info:   Adds support for the ltc294x family of battery gauges
++Load:   dtoverlay=ltc294x,<param>=<val>
++Params: ltc2941                 Select the ltc2941 device
++
++        ltc2942                 Select the ltc2942 device
++
++        ltc2943                 Select the ltc2943 device
++
++        ltc2944                 Select the ltc2944 device
++
++        resistor-sense          The sense resistor value in milli-ohms.
++                                Can be a 32-bit negative value when the battery
++                                has been connected to the wrong end of the
++                                resistor.
++
++        prescaler-exponent      Range and accuracy of the gauge. The value is
++                                programmed into the chip only if it differs
++                                from the current setting.
++                                For LTC2941 only:
++                                - Default value is 128
++                                - the exponent is in the range 0-7 (default 7)
++                                See the datasheet for more information.
++
++
+ Name:   mbed-dac
+ Info:   Configures the mbed AudioCODEC (TLV320AIC23B)
+ Load:   dtoverlay=mbed-dac
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/ltc294x-overlay.dts
+@@ -0,0 +1,86 @@
++/dts-v1/;
++/plugin/;
++
++
++/ {
++	compatible = "brcm,bcm2835";
++
++	fragment@0 {
++		target = <&i2c_arm>;
++		__dormant__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			status = "okay";
++
++			ltc2941: ltc2941@64 {
++				compatible = "lltc,ltc2941";
++				reg = <0x64>;
++				lltc,resistor-sense = <50>;
++				lltc,prescaler-exponent = <7>; 
++			};
++		};
++	};
++
++	fragment@1 {
++		target = <&i2c_arm>;
++		__dormant__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			status = "okay";
++
++			ltc2942: ltc2942@64 {
++				compatible = "lltc,ltc2942";
++				reg = <0x64>;
++				lltc,resistor-sense = <50>;
++				lltc,prescaler-exponent = <7>; 
++			};
++		};
++	};
++
++	fragment@2 {
++		target = <&i2c_arm>;
++		__dormant__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			status = "okay";
++
++			ltc2943: ltc2943@64 {
++				compatible = "lltc,ltc2943";
++				reg = <0x64>;
++				lltc,resistor-sense = <50>;
++				lltc,prescaler-exponent = <7>; 
++			};
++		};
++	};
++
++	fragment@3 {
++		target = <&i2c_arm>;
++		__dormant__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			status = "okay";
++
++			ltc2944: ltc2944@64 {
++				compatible = "lltc,ltc2944";
++				reg = <0x64>;
++				lltc,resistor-sense = <50>;
++				lltc,prescaler-exponent = <7>; 
++			};
++		};
++	};
++
++	__overrides__ {
++		ltc2941 = <0>,"+0";
++		ltc2942 = <0>,"+1";
++		ltc2943 = <0>,"+2";
++		ltc2944 = <0>,"+3";
++		resistor-sense = <&ltc2941>, "lltc,resistor-sense:0",
++			         <&ltc2942>, "lltc,resistor-sense:0",
++				 <&ltc2943>, "lltc,resistor-sense:0",
++				 <&ltc2944>, "lltc,resistor-sense:0";
++		prescaler-exponent = <&ltc2941>, "lltc,prescaler-exponent:0",
++			         <&ltc2942>, "lltc,prescaler-exponent:0",
++				 <&ltc2943>, "lltc,prescaler-exponent:0",
++				 <&ltc2944>, "lltc,prescaler-exponent:0";
++	};
++};