Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
new file mode 100644
index 000000000..2a97553d8
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
@@ -0,0 +1,27 @@
+* Generic 8-bits shift register GPIO driver
+
+Required properties:
+- compatible: Should contain one of the following:
+    "fairchild,74hc595"
+    "nxp,74lvc594"
+- reg : chip select number
+- gpio-controller : Marks the device node as a gpio controller.
+- #gpio-cells : Should be two.  The first cell is the pin number and
+  the second cell is used to specify the gpio polarity:
+      0 = active high
+      1 = active low
+- registers-number: Number of daisy-chained shift registers
+
+Optional properties:
+- enable-gpios: GPIO connected to the OE (Output Enable) pin.
+
+Example:
+
+gpio5: gpio5@0 {
+	compatible = "fairchild,74hc595";
+	reg = <0>;
+	gpio-controller;
+	#gpio-cells = <2>;
+	registers-number = <4>;
+	spi-max-frequency = <100000>;
+};