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From:   Baolin Wang <baolin.wang@linaro.org>
To:     sre@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com
Cc:     linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, yuanjiang.yu@unisoc.com,
        baolin.wang@linaro.org, broonie@kernel.org, ctatlor97@gmail.com,
        linus.walleij@linaro.org
Subject: [PATCH v2 3/4] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation
Date:   Wed, 26 Sep 2018 10:59:13 +0800
Message-Id: <b4b36b7b54cc227e6e7f14c314b4617863a205f5.1537930252.git.baolin.wang@linaro.org>
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This patch adds the binding documentation for Spreadtrum SC27XX series PMICs
fuel gauge unit device, which is used to calculate the battery capacity.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
Changes from v1:
 - Renamed GPIO property.
 - Use standand battery properties instead of 'sprd,inner-resist' and
   'sprd,ocv-cap-table'.
 - Remove battery node's description.
---
 .../devicetree/bindings/power/supply/sc27xx-fg.txt |   52 ++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt

diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt
new file mode 100644
index 0000000..b161468
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt
@@ -0,0 +1,52 @@
+Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings
+
+Required properties:
+- compatible: Should be one of the following:
+  "sprd,sc2720-fgu",
+  "sprd,sc2721-fgu",
+  "sprd,sc2723-fgu",
+  "sprd,sc2730-fgu",
+  "sprd,sc2731-fgu".
+- reg: The address offset of fuel gauge unit.
+- battery-detect-gpios: GPIO for battery detection.
+- io-channels: Specify the IIO ADC channel to get temperature.
+- io-channel-names: Should be "bat-temp".
+- monitored-battery: Phandle of battery characteristics devicetree node.
+  See Documentation/devicetree/bindings/power/supply/battery.txt
+
+Example:
+
+	bat: battery {
+		compatible = "simple-battery";
+		charge-full-design-microamp-hours = <1900000>;
+		constant-charge-voltage-max-microvolt = <4350000>;
+		ocv-capacity-table-temperatures = <20>;
+		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>,
+					<4022000 85>, <3983000 80>, <3949000 75>,
+					<3917000 70>, <3889000 65>, <3864000 60>,
+					<3835000 55>, <3805000 50>, <3787000 45>,
+					<3777000 40>, <3773000 35>, <3770000 30>,
+					<3765000 25>, <3752000 20>, <3724000 15>,
+					<3680000 10>, <3605000 5>, <3400000 0>;
+		......
+	};
+
+	sc2731_pmic: pmic@0 {
+		compatible = "sprd,sc2731";
+		reg = <0>;
+		spi-max-frequency = <26000000>;
+		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		fgu@a00 {
+			compatible = "sprd,sc2731-fgu";
+			reg = <0xa00>;
+			battery-detect-gpios = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
+			io-channels = <&pmic_adc 5>;
+			io-channel-names = "bat-temp";
+			monitored-battery = <&bat>;
+		};
+	};
-- 
1.7.9.5