linux-kernel - [PATCH v1 1/2] dt-binding: soc: Add common LPC snoop documentation

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Message-Id: <20190610133245.306812-2-tmaimon77@gmail.com>
Date:   Mon, 10 Jun 2019 16:32:44 +0300
From:   Tomer Maimon <tmaimon77@...il.com>
To:     olof@...om.net, gregkh@...uxfoundation.org, arnd@...db.de,
        robh+dt@...nel.org, mark.rutland@....com, avifishman70@...il.com,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        joel@....id.au
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        openbmc@...ts.ozlabs.org, Tomer Maimon <tmaimon77@...il.com>
Subject: [PATCH v1 1/2] dt-binding: soc: Add common LPC snoop documentation

Added device tree binding documentation for Nuvoton BMC
NPCM BIOS Post Code (BPC) and Aspeed AST2500 LPC snoop.
The LPC snoop monitoring two configurable I/O addresses
written by the host on Low Pin Count (LPC) bus.

Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
Reviewed-by: Andrew Jeffery <andrew@...id.au>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 .../devicetree/bindings/soc/lpc/lpc-snoop.txt | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/lpc/lpc-snoop.txt

diff --git a/Documentation/devicetree/bindings/soc/lpc/lpc-snoop.txt b/Documentation/devicetree/bindings/soc/lpc/lpc-snoop.txt
new file mode 100644
index 000000000000..c21cb8df4ffb
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/lpc/lpc-snoop.txt
@@ -0,0 +1,27 @@
+LPC snoop interface
+
+The LPC snoop (BIOS Post Code) interface can monitor
+two configurable I/O addresses written by the host on
+the Low Pin Count (LPC) bus.
+
+Nuvoton NPCM7xx LPC snoop supports capture double words,
+when using capture double word only I/O address 1 is monitored.
+
+Required properties for lpc-snoop node
+- compatible   : "nuvoton,npcm750-lpc-bpc-snoop" for Poleg NPCM7XX
+                 "aspeed,ast2500-lpc-snoop" for Aspeed AST2500.
+- reg          : specifies physical base address and size of the registers.
+- interrupts   : contain the LPC snoop interrupt with flags for falling edge.
+- snoop-ports  : contain monitor I/O addresses, at least one monitor I/O
+                 address required
+
+Optional property for NPCM7xx lpc-snoop node
+- nuvoton,lpc-en-dwcapture : enable capture double words support.
+
+Example:
+	lpc-snoop: lpc_snoop@...07040 {
+		compatible = "nuvoton,npcm750-lpc-bpc-snoop";
+		reg = <0xf0007040 0x14>;
+		snoop-ports = <0x80>;
+		interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+	};
-- 
2.18.0