[PATCH v6 18/23] mfd: max77802: Add DT binding documentation

[Javier Martinez Canillas]

Add Device Tree binding documentation for Maxim 77802 PMIC.

Signed-off-by: Javier Martinez Canillas <javier.martinez at collabora.co.uk>
---

Changes since v5:
 - Use max77686,* properties instead of max77802,* since the support is
   now in the max77686 driver and that IP defined the properties first.
 - Fix issues in DT binding documentation. Suggested by Andreas Farber.

Changes since v4: None

Changes since v3: None

Changes since v2:
 - Explain better the Dynamic Voltage Scaling (DVS) support in some Buck
   regulators and the max77802,pmic-buck-{dvs,selb}-gpios properties.
   Suggested by Mark Brown.
---
 Documentation/devicetree/bindings/mfd/max77802.txt | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/max77802.txt

diff --git a/Documentation/devicetree/bindings/mfd/max77802.txt b/Documentation/devicetree/bindings/mfd/max77802.txt
new file mode 100644
index 0000000..5460e20
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/max77802.txt
@@ -0,0 +1,95 @@
+Maxim MAX77802 multi-function device
+
+MAX77802 is a Multifunction device with PMIC, RTC and Charger on chip. It is
+interfaced to host controller using i2c interface. PMIC, Charger and RTC
+submodules are addressed using same i2c slave address.
+
+Buck regulators 1, 2, 3, 4 and 6 include Dynamic Voltage Scaling (DVS) that
+allows each output voltage to change dynamically. Each Buck output voltage
+is selected using a set of external inputs: DVS1-3 and SELB1, 2, 3, 4 and 6.
+
+There are 8 DVS registers that can be used to configure the output voltage
+for each Buck regulator and which one is active is controled by DVSx lines.
+
+SELBx lines are used to control if individual Buck lines are ON or OFF.
+
+This document describes the binding for mfd device and PMIC submodule.
+
+Binding for the built-in 32k clock generator block is defined separately
+in bindings/clk/maxim,max77802.txt file.
+
+Required properties:
+- compatible : Must be "maxim,max77802";
+- reg : Specifies the i2c slave address of PMIC block.
+- interrupts : This i2c device has an IRQ line connected to the main SoC.
+- interrupt-parent : The parent interrupt controller.
+
+Optional properties:
+- max77686,pmic-buck-default-dvs-idx: We'll always write this DVS index in the
+  PMIC for Bucks with DVS.
+  NOTE: at the moment these bindings don't include enough details for actual
+  GPIO-DVS--this just lets you choose which single slot to use.
+
+- max77686,pmic-buck-dvs-gpios: A GPIO array where each GPIO is connected to a
+  DVS line. We'll try to set these GPIOs to match pmic-buck-default-dvs-idx at
+  probe time if they are defined. If some or all of these GPIOs are not defined
+  it's assumed that the board has any missing GPIOs hardwired to match
+  pmic-buck-default-dvs-idx.
+
+- max77686,pmic-buck-selb-gpios: A GPIO array where each GPIO is connected to a
+  SELBx line. Should be five values: 1, 2, 3, 4, 6. It is strongly suggested to
+  include these GPIOs if there's any chance that changing DVS GPIOs one line at
+  a time might glitch your DVS values.
+
+Optional node:
+- regulators : The regulators of max77802 have to be instantiated
+  under subnode named "regulators" using the following format.
+
+	regulator-name {
+		standard regulator constraints....
+	};
+	refer Documentation/devicetree/bindings/regulator/regulator.txt
+
+  The regulator node name should be initialized with a string
+to get matched with their hardware counterparts as follow. The valid names are:
+
+	-LDOn 	:	for LDOs, where n can lie in range 1 to 35.
+			example: LDO1, LDO2, LDO35.
+	-BUCKn 	:	for BUCKs, where n can lie in range 1 to 10.
+			example: BUCK1, BUCK5, BUCK10.
+Example:
+
+	max77802 at 09 {
+		compatible = "maxim,max77802";
+		interrupt-parent = <&wakeup_eint>;
+		interrupts = <26 0>;
+		reg = <0x09>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		max77686,pmic-buck-default-dvs-idx = <1>;
+		max77686,pmic-buck-dvs-gpios = <&gpy7 6 0>,
+					       <&gpj4 2 0>,
+					       <&gpj4 3 0>;
+		max77686,pmic-buck-selb-gpios = <&gph0 2 0>,
+						<&gph0 3 0>,
+						<&gph0 4 0>,
+						<&gph0 5 0>,
+						<&gph0 6 0>;
+
+		regulators {
+			ldo11_reg: LDO11 {
+				regulator-name = "vdd_ldo11";
+				regulator-min-microvolt = <1900000>;
+				regulator-max-microvolt = <1900000>;
+				regulator-always-on;
+			};
+
+			buck1_reg: BUCK1 {
+				regulator-name = "vdd_mif";
+				regulator-min-microvolt = <950000>;
+				regulator-max-microvolt = <1300000>;
+				regulator-always-on;
+				regulator-boot-on;
+			};
+	};
-- 
2.0.0.rc2