This patch adds documentation of device tree bindings for the
STMicroelectronics Multi-Function eXpander (STMFX) MFD core.
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
---
Documentation/devicetree/bindings/mfd/stmfx.txt | 28 +++++++++++++++++++++++++
1 file changed, 28 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/stmfx.txt
diff --git a/Documentation/devicetree/bindings/mfd/stmfx.txt b/Documentation/devicetree/bindings/mfd/stmfx.txt
new file mode 100644
index 0000000..21cf798
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/stmfx.txt
@@ -0,0 +1,28 @@
+STMicroelectonics Multi-Function eXpander (STMFX) Core bindings
+
+ST Multi-Function eXpander (STMFX) is a slave controller using I2C for
+communication with the main MCU. Its main features are GPIO expansion, main
+MCU IDD measurement (IDD is the amount of current that flows through VDD) and
+resistive touchscreen controller.
+
+Required properties:
+- compatible: should be "st,stmfx-0300".
+- reg: I2C slave address of the device.
+- interrupt-parent: phandle of the STMFX parent interrupt controller.
+- interrutps: interrupt specifier triggered by MFX_IRQ_OUT signal.
+
+Optional properties:
+- drive-open-drain: configure MFX_IRQ_OUT as open drain.
+- vdd-supply: phandle of the regulator supplying STMFX.
+
+Example:
+
+ stmfx: stmfx@42 {
+ compatible = "st,stmfx-0300";
+ reg = <0x42>;
+ interrupts = <8 IRQ_TYPE_EDGE_RISING>;
+ interrupt-parent = <&gpioi>;
+ vdd-supply = <&v3v3>;
+ };
+
+Please refer to ../pinctrl/pinctrl-stmfx.txt for STMFX GPIO expander function bindings.
--
2.7.4
