spi: Add DT bindings documentation for Netlogic XLP SPI controller

Add DT bindings documentation for SPI controller driver used by
Netlogic XLP MIPS64 SoCs.

Signed-off-by: Kamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/spi/spi-xlp.txt b/Documentation/devicetree/bindings/spi/spi-xlp.txt
new file mode 100644 (file)
index 0000000..40e82d5
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-xlp.txt
@@ -0,0 +1,39 @@
+SPI Master controller for Netlogic XLP MIPS64 SOCs
+==================================================
+
+Currently this SPI controller driver is supported for the following
+Netlogic XLP SoCs:
+       XLP832, XLP316, XLP208, XLP980, XLP532
+
+Required properties:
+- compatible           : Should be "netlogic,xlp832-spi".
+- #address-cells       : Number of cells required to define a chip select address
+                         on the SPI bus.
+- #size-cells          : Should be zero.
+- reg                  : Should contain register location and length.
+- clocks               : Phandle of the spi clock
+- interrupts           : Interrupt number used by this controller.
+- interrupt-parent     : Phandle of the parent interrupt controller.
+
+SPI slave nodes must be children of the SPI master node and can contain
+properties described in Documentation/devicetree/bindings/spi/spi-bus.txt.
+
+Example:
+
+       spi: xlp_spi@3a100 {
+               compatible = "netlogic,xlp832-spi";
+               #address-cells = <1>;
+               #size-cells = <0>;
+               reg = <0 0x3a100 0x100>;
+               clocks = <&spi_clk>;
+               interrupts = <34>;
+               interrupt-parent = <&pic>;
+
+               spi_nor@1 {
+                       compatible = "spansion,s25sl12801";
+                       #address-cells = <1>;
+                       #size-cells = <1>;
+                       reg = <1>;      /* Chip Select */
+                       spi-max-frequency = <40000000>;
+               };
+};