linux-kernel - [PATCH v1 08/12] arm64: dts: librem5-devkit: add a battery for the bq25896 to monitor

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Message-Id: <20200205143003.28408-9-martin.kepplinger@puri.sm>
Date:   Wed,  5 Feb 2020 15:29:59 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     robh@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com
Cc:     linux-imx@....com, Anson.Huang@....com, devicetree@...r.kernel.org,
        kernel@...i.sm, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Angus Ainslie (Purism)" <angus@...ea.ca>
Subject: [PATCH v1 08/12] arm64: dts: librem5-devkit: add a battery for the bq25896 to monitor

From: "Angus Ainslie (Purism)" <angus@...ea.ca>

Add a simple-battery with default power capacity

Discharge curve comes from the panasonic NCR18650B datasheet

https://www.batteryspace.com/prod-specs/NCR18650B.pdf

Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
---
 .../dts/freescale/imx8mq-librem5-devkit.dts     | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
index 6a8f6cee96cf..4957acc512d5 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
@@ -26,6 +26,22 @@
 		power-supply = <&reg_22v4_p>;
 	};
 
+	bat: battery {
+		compatible = "simple-battery";
+		voltage-min-design-microvolt = <3000000>;
+		voltage-max-design-microvolt = <4192000>;
+		energy-full-design-microwatt-hours = <11700000>;
+		charge-full-design-microamp-hours = <3250000>;
+		precharge-current-microamp = <130000>;
+		charge-term-current-microamp = <66000>;
+		constant-charge-current-max-microamp = <1600000>;
+		constant-charge-voltage-max-microvolt = <4200000>;
+		factory-internal-resistance-micro-ohms = <250000>;
+		ocv-capacity-celsius = <25>;
+		ocv-capacity-table-0 = <4192000 100>, <3750000 85>, <3650000 68>,
+			<3500000 51>, <3400000 34>, <3250000 17>, <3000000 0>;
+	};
+
 	chosen {
 		stdout-path = &uart1;
 	};
@@ -480,6 +496,7 @@
 		ti,minimum-sys-voltage = <3000000>; /* 3V */
 		ti,boost-voltage = <5000000>; /* 5V */
 		ti,boost-max-current = <50000>; /* 50mA */
+		monitored-battery = <&bat>;
 	};
 };
 
-- 
2.20.1