dt-binding: bmc: Add NPCM7xx LPC BPC documentation

Added device tree binding documentation for Nuvoton BMC
NPCM7xx BIOS Post Code (BPC).
The NPCM7xx BPC monitoring two configurable I/O addresses
written by the host on Low Pin Count (LPC) bus.

OpenBMC-Staging-Count: 2
Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

1 files changed, 26 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/bmc/npcm7xx-lpc-bpc.txt b/Documentation/devicetree/bindings/bmc/npcm7xx-lpc-bpc.txt
new file mode 100644
index 000000000000..0832c9cbea32
--- /dev/null
+++ b/Documentation/devicetree/bindings/bmc/npcm7xx-lpc-bpc.txt
@@ -0,0 +1,26 @@
+Nuvoton NPCM7xx LPC BPC interface
+
+Nuvoton BMC NPCM7xx BIOS Post Code (BPC) monitoring two
+configurable I/O addresses written by the host on the
+Low Pin Count (LPC) bus, the capure data stored in 128-word FIFO.
+
+NPCM7xx BPC supports capture double words, when using capture
+double word only I/O address 1 is monitored.
+
+Required properties for lpc_bpc node
+- compatible	: "nuvoton,npcm750-lpc-bpc" for Poleg NPCM7XX.
+- reg 			: specifies physical base address and size of the registers.
+- interrupts	: contain the LPC BPC with flags for falling edge.
+- monitor-ports : contain monitor I/O addresses, at least one monitor I/O
+				  address required
+
+Optional property for lpc_bpc node
+- bpc-en-dwcapture : enable capture double words support.
+
+Example:
+	lpc_bpc: lpc-bpc@f0007040 {
+		compatible = "nuvoton,npcm7xx-lpc-bpc";
+		reg = <0xf0007040 0x14>;
+		monitor-ports = <0x80>;
+		interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+	};