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Message-Id: <1398789430-23897-2-git-send-email-p.zabel@pengutronix.de>
Date: Tue, 29 Apr 2014 18:37:09 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Mark Brown <broonie@...nel.org>
Cc: Liam Girdwood <lgirdwood@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel@...gutronix.de,
Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 2/3] regulator: ltc3589: Add DT binding documentation
This patch adds the device tree binding documentation for Linear
Technology LTC3589, LTC3589-1, and LTC3589-2 8-port regulators.
Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
.../devicetree/bindings/regulator/ltc3589.txt | 99 ++++++++++++++++++++++
1 file changed, 99 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regulator/ltc3589.txt
diff --git a/Documentation/devicetree/bindings/regulator/ltc3589.txt b/Documentation/devicetree/bindings/regulator/ltc3589.txt
new file mode 100644
index 0000000..4229a2e
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/ltc3589.txt
@@ -0,0 +1,99 @@
+Linear Technology LTC3589, LTC3589-1, and LTC3589-2 8-output regulators
+
+Required properties:
+- compatible: "ltc,ltc3589", "ltc,ltc3589-1" or "ltc,ltc3589-2"
+- reg: I2C slave address
+
+Required child node:
+- regulators: Contains eight regulator child nodes sw1, sw2, sw3, bb-out,
+ ldo1, ldo2, ldo3, and ldo4, specifying the initialization data as
+ documented in Documentation/devicetree/bindings/regulator/regulator.txt.
+
+Each regulator is defined using the standard binding for regulators. The
+nodes for sw1, sw2, sw3, bb-out, ldo1, and ldo2 additionally need to specify
+the resistor values of their external feedback voltage dividers:
+
+Required properties (not on ldo3, ldo4):
+- ltc,fb-voltage-divider: An array of two integers containing the resistor
+ values R1 and R2 of the feedback voltage divider in ohms.
+
+Regulators sw1, sw2, sw3, and ldo2 can regulate the feedback reference from
+0.3625 V to 0.75 V in 12.5 mV steps. The output voltage thus ranges between
+0.3625 * (1 + R1/R2) V and 0.75 * (1 + R1/R2) V. Regulators bb-out and ldo1
+have a fixed 0.8 V reference and thus output 0.8 * (1 + R1/R2) V. The ldo3
+regulator is fixed to 1.8 V on LTC3589 and to 2.8 V on LTC3589-1,2. The ldo4
+regulator can output between 1.8 V and 3.3 V on LTC3589 and between 1.2 V
+and 3.2 V on LTC3589-1,2 in four steps. The ldo1 standby regulator can not
+be disabled and thus should have the regulator-always-on property set.
+
+Example:
+
+ ltc3589: pmic@34 {
+ compatible = "ltc,ltc3589-1";
+ reg = <0x34>;
+
+ regulators {
+ sw1_reg: sw1 {
+ regulator-min-microvolt = <591930>;
+ regulator-max-microvolt = <1224671>;
+ ltc,fb-voltage-divider = <100000 158000>;
+ regulator-ramp-delay = <7000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ sw2_reg: sw2 {
+ regulator-min-microvolt = <704123>;
+ regulator-max-microvolt = <1456803>;
+ ltc,fb-voltage-divider = <180000 191000>;
+ regulator-ramp-delay = <7000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ sw3_reg: sw3 {
+ regulator-min-microvolt = <1341250>;
+ regulator-max-microvolt = <2775000>;
+ ltc,fb-voltage-divider = <270000 100000>;
+ regulator-ramp-delay = <7000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ bb_out_reg: bb-out {
+ regulator-min-microvolt = <3387341>;
+ regulator-max-microvolt = <3387341>;
+ ltc,fb-voltage-divider = <511000 158000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo1_reg: ldo1 {
+ regulator-min-microvolt = <1306329>;
+ regulator-max-microvolt = <1306329>;
+ ltc,fb-voltage-divider = <100000 158000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo2_reg: ldo2 {
+ regulator-min-microvolt = <704123>;
+ regulator-max-microvolt = <1456806>;
+ ltc,fb-voltage-divider = <180000 191000>;
+ regulator-ramp-delay = <7000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo3_reg: ldo3 {
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ regulator-boot-on;
+ };
+
+ ldo4_reg: ldo4 {
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <3200000>;
+ };
+ };
+ };
--
1.9.1
--
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