Enable AXP209 battery supply

README.md

@@ -83,3 +83,9 @@ Oct 19 06:11:32 nixos kernel: sunxi-mmc 1c10000.mmc: send stop command failed
 Is not in currently in DTB at all.
 Maybe use sun7i-a20 as example. It has a "codec" block.
 See the S3 manual, grep for I2S/PCM.
+
+## Power Supply
+See `/sys/class/power_supply/axp20x-ac`.
+See `/sys/class/power_supply/axp20x-battery/{status,capacity}`.
+Green LED if power is on.
+Red LED if battery is charging.

configuration.nix

@@ -46,6 +46,7 @@ in
       '';
     }
     { name = "pinecube-ir-leds"; patch = ./kernel/0001-ARM-dts-sun8i-s3l-fix-Pinecube-IR-LEDs.patch; }
+    { name = "pinecube-add-battery"; patch = ./kernel/0002-ARM-dts-sun8i-s3l-add-battery-power-supply-to-pinecu.patch; }
   ];
 
   boot.extraModulePackages = [ config.boot.kernelPackages.rtl8189es ];

kernel/0002-ARM-dts-sun8i-s3l-add-battery-power-supply-to-pinecu.patch

@@ -0,0 +1,29 @@
+From 08043145ab7046e85339a9bd3221cc8ee53e64e5 Mon Sep 17 00:00:00 2001
+From: Daniel Fullmer <danielrf12@gmail.com>
+Date: Fri, 23 Oct 2020 16:05:10 -0700
+Subject: [PATCH 2/2] ARM: dts: sun8i: s3l: add battery power supply to
+ pinecube
+
+Signed-off-by: Daniel Fullmer <danielrf12@gmail.com>
+---
+ arch/arm/boot/dts/sun8i-s3-pinecube.dts | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/arch/arm/boot/dts/sun8i-s3-pinecube.dts b/arch/arm/boot/dts/sun8i-s3-pinecube.dts
+index a4adf52ef406..0319327dea3c 100644
+--- a/arch/arm/boot/dts/sun8i-s3-pinecube.dts
++++ b/arch/arm/boot/dts/sun8i-s3-pinecube.dts
+@@ -169,6 +169,10 @@ &ac_power_supply {
+ 	status = "okay";
+ };
+ 
++&battery_power_supply {
++	status = "okay";
++};
++
+ &reg_dcdc2 {
+ 	regulator-always-on;
+ 	regulator-min-microvolt = <1250000>;
+-- 
+2.28.0
+