From: Lukasz Majewski <lukma@denx.de>
Date: Thu, 27 Sep 2018 22:26:55 +0000 (+0200)
Subject: dt-bindings: misc: bk4: Add device tree binding for Liebherr's BK4 SPI bus
X-Git-Tag: v5.4-rc1~2235^2~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8d452721628db190964ab44e302c3e3fb3bdb8ef;p=platform%2Fkernel%2Flinux-rpi.git

dt-bindings: misc: bk4: Add device tree binding for Liebherr's BK4 SPI bus

Add Device Tree binding document for Liebherr's BK4 external SPI bus.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Rob Herring <robh@kernel.org>
---

diff --git a/Documentation/devicetree/bindings/misc/lwn-bk4.txt b/Documentation/devicetree/bindings/misc/lwn-bk4.txt
new file mode 100644
index 0000000..d6a8c18
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/lwn-bk4.txt
@@ -0,0 +1,26 @@
+* Liebherr's BK4 controller external SPI
+
+A device which handles data acquisition from compatible industrial
+peripherals.
+The SPI is used for data and management purposes in both master and
+slave modes.
+
+Required properties:
+
+- compatible : Should be "lwn,bk4"
+
+Required SPI properties:
+
+- reg : Should be address of the device chip select within
+  the controller.
+
+- spi-max-frequency : Maximum SPI clocking speed of device in Hz, should be
+  30MHz at most for the Liebherr's BK4 external bus.
+
+Example:
+
+spidev0: spi@0 {
+	compatible = "lwn,bk4";
+	spi-max-frequency = <30000000>;
+	reg = <0>;
+};