[PATCH 1/6] Documentation: dt-bindings: Add Aspeed PECI

[Jae Hyun Yoo]

This commit adds a dt-bindings document for Aspeed PECI.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
---
 .../devicetree/bindings/misc/aspeed-peci.txt       | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/aspeed-peci.txt

diff --git a/Documentation/devicetree/bindings/misc/aspeed-peci.txt b/Documentation/devicetree/bindings/misc/aspeed-peci.txt
new file mode 100644
index 000000000000..af950d72a48c
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/aspeed-peci.txt
@@ -0,0 +1,52 @@
+* ASPEED PECI (Platform Environment Control Interface) misc driver.
+
+Hardware Interfaces:
+- This driver implements support for the ASPEED AST2400/2500 PECI which has the
+  following features:
+	- Directly connected to APB bus
+	- Intel PECI 3.1 compliant (PECI 3.0 for AST2400)
+	- Maximum packet length is 256 bytes (Baseline transmission unit)
+	- Support up to 8 CPUs and 2 domains per CPU
+	- Integrate PECI compliant I/O buffers, can connect to PECI bus directly
+	- Transmit buffer 32 bytes and receive buffer 32 bytes
+
+Required properties:
+- compatible: "aspeed,ast2400-peci" or "aspeed,ast2500-peci"
+	- aspeed,ast2400-peci: Aspeed AST2400 family PECI control interface
+	- aspeed,ast2500-peci: Aspeed AST2500 family PECI control interface
+- reg: Should contain PECI registers location and length
+- interrupts: Should contain PECI interrupt
+
+Optional properties:
+- msg_timing_nego: Message timing negotiation period
+	0 ~ 255 (default: 1)
+- addr_timing_nego: Address timing negotiation period
+	0 ~ 255 (default: 1)
+- rd_sampling_point: Read sampling point selection
+	0 ~ 15 (default: 8)
+- clk_div: Clock divider for 24MHz clock source
+	0: Divide by 1   <- default
+	1: Divide by 2
+	2: Divide by 4
+	3: Divide by 8
+	4: Divide by 16
+	5: Divide by 32
+	6: Divide by 64
+	7: Divide by 128
+- cmd_timeout_ms: Command timeout in units of ms
+	1 ~ 60000 (default: 1000)
+
+Example:
+	peci: peci at 1e78b000 {
+		compatible = "aspeed,ast2500-peci", "syscon", "simple-mfd";
+		reg = <0x1e78b000 0x60>;
+		reg-io-width = <4>;
+		interrupt-controller;
+		interrupts = <15>;
+		msg-timing-nego = <1>;
+		addr-timing-nego = <1>;
+		rd-sampling-point = <8>;
+		clk-div = <0>;
+		cmd-timeout-ms = <1000>;
+	};
+
-- 
2.15.1