[PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs
From: Pavel Machek <hidden>
Date: 2018-03-06 12:40:02
Also in:
linux-devicetree, linux-doc, linux-hwmon, lkml, openbmc
Hi!
quoted hunk ↗ jump to hunk
Signed-off-by: Jae Hyun Yoo <redacted> --- .../devicetree/bindings/peci/peci-aspeed.txt | 73 ++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txtdiff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt b/Documentation/devicetree/bindings/peci/peci-aspeed.txt new file mode 100644 index 000000000000..8a86f346d550 --- /dev/null +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt@@ -0,0 +1,73 @@ +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.
Are these SoCs x86-based?
+Required properties: +- compatible + "aspeed,ast2400-peci" or "aspeed,ast2500-peci" + - aspeed,ast2400-peci: Aspeed AST2400 family PECI controller + - aspeed,ast2500-peci: Aspeed AST2500 family PECI controller + +- reg + Should contain PECI registers location and length.
Other dts documents put it on one line, reg: Should contain ...
+- clock_frequency + Should contain the operation frequency of PECI hardware module. + 187500 ~ 24000000
specify this is Hz?
+- rd-sampling-point + Read sampling point selection. The whole period of a bit time will be + divided into 16 time frames. This value will determine which time frame + this controller will sample PECI signal for data read back. Usually in + the middle of a bit time is the best.
English? "This value will determine when this controller"?
+ 0 ~ 15 (default: 8)
+
+- cmd_timeout_ms
+ Command timeout in units of ms.
+ 1 ~ 60000 (default: 1000)
+
+Example:
+ peci: peci at 1e78b000 {
+ compatible = "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x1e78b000 0x60>;
+
+ peci0: peci-bus at 0 {
+ compatible = "aspeed,ast2500-peci";
+ reg = <0x0 0x60>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ interrupts = <15>;
+ clocks = <&clk_clkin>;
+ clock-frequency = <24000000>;
+ msg-timing-nego = <1>;
+ addr-timing-nego = <1>;
+ rd-sampling-point = <8>;
+ cmd-timeout-ms = <1000>;
+ };
+ };
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