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151 lines
4.1 KiB
Diff
151 lines
4.1 KiB
Diff
From 585ea300fa44cdf3c3259af68c49518bb85e4af2 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 1 May 2018 09:35:56 +0100
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Subject: [PATCH 289/454] overlays: Add ltc294x (battery gauge)
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Support the LTC294x range of I2C-connected battery monitors.
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See: https://github.com/raspberrypi/linux/issues/2537
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 25 ++++++
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.../arm/boot/dts/overlays/ltc294x-overlay.dts | 86 +++++++++++++++++++
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3 files changed, 112 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/ltc294x-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -60,6 +60,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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justboom-dac.dtbo \
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justboom-digi.dtbo \
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lirc-rpi.dtbo \
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+ ltc294x.dtbo \
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mbed-dac.dtbo \
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mcp23017.dtbo \
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mcp23s17.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -1020,6 +1020,31 @@ Params: gpio_out_pin GPIO for
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(default "off")
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+Name: ltc294x
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+Info: Adds support for the ltc294x family of battery gauges
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+Load: dtoverlay=ltc294x,<param>=<val>
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+Params: ltc2941 Select the ltc2941 device
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+
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+ ltc2942 Select the ltc2942 device
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+
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+ ltc2943 Select the ltc2943 device
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+
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+ ltc2944 Select the ltc2944 device
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+
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+ resistor-sense The sense resistor value in milli-ohms.
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+ Can be a 32-bit negative value when the battery
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+ has been connected to the wrong end of the
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+ resistor.
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+
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+ prescaler-exponent Range and accuracy of the gauge. The value is
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+ programmed into the chip only if it differs
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+ from the current setting.
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+ For LTC2941 only:
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+ - Default value is 128
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+ - the exponent is in the range 0-7 (default 7)
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+ See the datasheet for more information.
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+
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+
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Name: mbed-dac
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Info: Configures the mbed AudioCODEC (TLV320AIC23B)
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Load: dtoverlay=mbed-dac
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/ltc294x-overlay.dts
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@@ -0,0 +1,86 @@
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+/dts-v1/;
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+/plugin/;
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+
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target = <&i2c_arm>;
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ ltc2941: ltc2941@64 {
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+ compatible = "lltc,ltc2941";
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+ reg = <0x64>;
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+ lltc,resistor-sense = <50>;
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+ lltc,prescaler-exponent = <7>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&i2c_arm>;
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ ltc2942: ltc2942@64 {
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+ compatible = "lltc,ltc2942";
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+ reg = <0x64>;
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+ lltc,resistor-sense = <50>;
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+ lltc,prescaler-exponent = <7>;
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+ };
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&i2c_arm>;
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ ltc2943: ltc2943@64 {
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+ compatible = "lltc,ltc2943";
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+ reg = <0x64>;
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+ lltc,resistor-sense = <50>;
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+ lltc,prescaler-exponent = <7>;
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+ };
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+ };
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+ };
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+
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+ fragment@3 {
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+ target = <&i2c_arm>;
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ ltc2944: ltc2944@64 {
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+ compatible = "lltc,ltc2944";
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+ reg = <0x64>;
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+ lltc,resistor-sense = <50>;
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+ lltc,prescaler-exponent = <7>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ ltc2941 = <0>,"+0";
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+ ltc2942 = <0>,"+1";
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+ ltc2943 = <0>,"+2";
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+ ltc2944 = <0>,"+3";
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+ resistor-sense = <<c2941>, "lltc,resistor-sense:0",
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+ <<c2942>, "lltc,resistor-sense:0",
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+ <<c2943>, "lltc,resistor-sense:0",
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+ <<c2944>, "lltc,resistor-sense:0";
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+ prescaler-exponent = <<c2941>, "lltc,prescaler-exponent:0",
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+ <<c2942>, "lltc,prescaler-exponent:0",
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+ <<c2943>, "lltc,prescaler-exponent:0",
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+ <<c2944>, "lltc,prescaler-exponent:0";
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+ };
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+};
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