Signed-off-by: Jonathan Richardson <jonathar@xxxxxxxxxxxx>
---
.../devicetree/bindings/spi/brcm,mspi-spi.txt | 39 ++++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/brcm,mspi-spi.txt
diff --git a/Documentation/devicetree/bindings/spi/brcm,mspi-spi.txt b/Documentation/devicetree/bindings/spi/brcm,mspi-spi.txt
new file mode 100644
index 0000000..e86a7a0
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/brcm,mspi-spi.txt
@@ -0,0 +1,39 @@
+Broadcom MSPI controller
+
+The Broadcom MSPI controller is a SPI controller found on various chips such
+as Cygnus.
+
+Required properties:
+- compatible: Must be "brcm,mspi-v0".
+
+- reg: The first register is the physical base address of the MSPI controller.
+ The second register is the address of the MSPI interrupt control registers. It
+ is only required for chips that have a separate register set for extended
+ interrupt control. This is required for Cygnus.
+
+- interrupts: Interrupt ID of the controller.
+
+Optional properties:
+- clocks: The MSPI reference clock. If not provided then it is assumed a clock
+ is enabled by default and no control of clock-frequency (see below) is
+ possible.
+
+- clock-names: The name of the reference clock.
+
+- clock-frequency: Desired frequency of the clock. This will set the serial
+ clock baud rate (SPBR) based on the reference clock frequency. The frequency
+ of the SPBR is mspi_clk / (2 * SPBR) where SPBR is a value between 1-255
+ determined by the desired 'clock-frequency'. If not provided then the default
+ baud rate of the controller is used.
+
+Example:
+
+mspi: mspi@18047200 {
+ compatible = "brcm,mspi-v0";
+ reg = <0x18047200 0x188>,
+ <0x180473a0 0x1c>;
+ interrupts = <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&axi41_clk>;
+ clock-names = "mspi_clk";
+ clock-frequency = <12500000>;
+};
--
1.7.9.5
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