[PATCH 1/2] dt-bindings: pfuze100: add optional pfuze-disable-sw binding

[Marco Felsch <m.felsch@pengutronix.de>]

This binding is used to keep the backward compatibility with the current
dtb's [1]. The binding informs the driver that the unused switch regulators
can be disabled.
If it is not specified, the driver doesn't disable the switch regulators.

[1] https://patchwork.kernel.org/patch/10490381/

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 Documentation/devicetree/bindings/regulator/pfuze100.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
index 672c939045ff..1f17ab7c7123 100644
--- a/Documentation/devicetree/bindings/regulator/pfuze100.txt
+++ b/Documentation/devicetree/bindings/regulator/pfuze100.txt
@@ -4,6 +4,14 @@ Required properties:
 - compatible: "fsl,pfuze100", "fsl,pfuze200", "fsl,pfuze3000", "fsl,pfuze3001"
 - reg: I2C slave address
 
+Optional properties:
+- pfuze-disable-sw: Disable all unused switch regulators to save power
+  consumption. Attention, some platforms are using the switch regulators as DDR
+  ref or supply voltage. Mark these regulators as "regulator-always-on" to skip
+  disabling these regulators. If not specified, the driver simualtes the
+  disabling. This means the state of the regulator is set to 'disabled' but the
+  driver don't disable the regulator.
+
 Required child node:
 - regulators: This is the list of child nodes that specify the regulator
   initialization data for defined regulators. Please refer to below doc
-- 
2.18.0