The MAX77686 PMIC submodule has Dynamic Voltage Scaling (DVS)
support on some regulators. Now that the regulator driver has
bindings to configure it, these bindings have to be documented.
Signed-off-by: Javier Martinez Canillas <javier.marti...@collabora.co.uk>
---
Documentation/devicetree/bindings/mfd/max77686.txt | 34 ++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/Documentation/devicetree/bindings/mfd/max77686.txt
b/Documentation/devicetree/bindings/mfd/max77686.txt
index 678f3cf..daf1c07 100644
--- a/Documentation/devicetree/bindings/mfd/max77686.txt
+++ b/Documentation/devicetree/bindings/mfd/max77686.txt
@@ -10,12 +10,38 @@ PMIC submodule.
Binding for the built-in 32k clock generator block is defined separately
in bindings/clk/maxim,max77686.txt file.
+Buck regulators 2, 3 and 4 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 SELB2, 3 and 4.
+
+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.
+
Required properties:
- compatible : Must be "maxim,max77686";
- 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 three values: 2, 3 and 4. 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:
- voltage-regulators : The regulators of max77686 have to be instantiated
under subnode named "voltage-regulators" using the following format.
@@ -42,6 +68,14 @@ Example:
interrupts = <26 0>;
reg = <0x09>;
+ 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 1 0>,
+ <&gph0 2 0>,
+ <&gph0 3 0>,
+
voltage-regulators {
ldo11_reg {
regulator-compatible = "LDO11";
--
2.0.0.rc2
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