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From 97fb20dfd682cf2748d1286322455cb8bf8b034d Mon Sep 17 00:00:00 2001
From: Clarke X <1014930533@qq.com>
Date: Sat, 8 Apr 2023 09:56:13 +0800
Subject: [PATCH] overlays: Add gpio-charger support
Add gpio-charger overlay for charger via gpio.
Signed-off-by: Clarke X <1014930533@qq.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 14 +++++++
.../dts/overlays/gpio-charger-overlay.dts | 42 +++++++++++++++++++
3 files changed, 57 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/gpio-charger-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -68,6 +68,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
ghost-amp.dtbo \
goodix.dtbo \
googlevoicehat-soundcard.dtbo \
+ gpio-charger.dtbo \
gpio-fan.dtbo \
gpio-hog.dtbo \
gpio-ir.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1248,6 +1248,20 @@ Load: dtoverlay=googlevoicehat-soundca
Params: <None>
+Name: gpio-charger
+Info: This is a generic overlay for detecting charger with GPIO.
+Load: dtoverlay=gpio-charger,<param>=<val>
+Params: gpio GPIO pin to trigger on (default 4)
+ active_low When this is 1 (active low), a falling
+ edge generates a charging event and a
+ rising edge generates a discharging event.
+ When this is 0 (active high), this is
+ reversed. The default is 0 (active high)
+ gpio_pull Desired pull-up/down state (off, down, up)
+ Default is "down".
+ type Set a charger type for the pin. (Default: mains)
+
+
Name: gpio-fan
Info: Configure a GPIO pin to control a cooling fan.
Load: dtoverlay=gpio-fan,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/gpio-charger-overlay.dts
@@ -0,0 +1,42 @@
+// Definitions for gpio-charger module
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ // Configure the gpio pin controller
+ target = <&gpio>;
+ __overlay__ {
+ pin_state: charger_pins@0 {
+ brcm,pins = <4>; // gpio number
+ brcm,function = <0>; // 0 = input, 1 = output
+ brcm,pull = <1>; // 0 = none, 1 = pull down, 2 = pull up
+ };
+ };
+ };
+ fragment@1 {
+ target-path = "/";
+ __overlay__ {
+ charger: charger@0 {
+ compatible = "gpio-charger";
+ pinctrl-0 = <&pin_state>;
+ status = "okay";
+ gpios = <&gpio 4 0>;
+ charger-type = "mains";
+ };
+ };
+ };
+
+ __overrides__ {
+ gpio = <&charger>,"reg:0",
+ <&charger>,"gpios:4",
+ <&pin_state>,"reg:0",
+ <&pin_state>,"brcm,pins:0";
+ type = <&charger>,"charger-type";
+ gpio_pull = <&pin_state>,"brcm,pull:0";
+ active_low = <&charger>,"gpios:8";
+ };
+
+};
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