linux-kernel - [PATCH linux-next v5 01/13] dt-bindings: Add a document of PECI subsystem

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Message-Id: <20180601182103.23630-1-jae.hyun.yoo@linux.intel.com>
Date:   Fri,  1 Jun 2018 11:21:03 -0700
From:   Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        openbmc@...ts.ozlabs.org
Cc:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
        Andrew Jeffery <andrew@...id.au>, Joel Stanley <joel@....id.au>
Subject: [PATCH linux-next v5 01/13] dt-bindings: Add a document of PECI subsystem

This commit adds a document of generic PECI bus, adapter and client
driver.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Reviewed-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
Reviewed-by: James Feist <james.feist@...ux.intel.com>
Reviewed-by: Vernon Mauery <vernon.mauery@...ux.intel.com>
Cc: Andrew Jeffery <andrew@...id.au>
Cc: Joel Stanley <joel@....id.au>
---
 .../devicetree/bindings/peci/peci.txt         | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/peci/peci.txt

diff --git a/Documentation/devicetree/bindings/peci/peci.txt b/Documentation/devicetree/bindings/peci/peci.txt
new file mode 100644
index 000000000000..8db2b1e56a01
--- /dev/null
+++ b/Documentation/devicetree/bindings/peci/peci.txt
@@ -0,0 +1,59 @@
+Generic device tree configuration for PECI buses
+================================================
+
+Required properties:
+- compatible     : Should be "simple-bus".
+- #address-cells : Should be present if the device has sub-nodes.
+- #size-cells    : Should be present if the device has sub-nodes.
+- ranges         : Should contain PECI controller registers ranges.
+
+Example:
+	peci: peci@...00000 {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x10000000 0x1000>;
+	};
+
+Generic device tree configuration for PECI adapters
+===================================================
+
+Required properties:
+- #address-cells : Should be <1>. Read more about client addresses below.
+- #size-cells    : Should be <0>. Read more about client addresses below.
+
+The cells properties above define that an address of CPU clients of a PECI bus
+are described by a single value.
+
+Example:
+	peci0: peci-bus@0 {
+		compatible = "soc,soc-peci";
+		reg = <0x0 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+Generic device tree configuration for PECI clients
+==================================================
+
+Required properties:
+- compatible : Should contain name of PECI client.
+- reg        : Should contain address of a client CPU. Address range of CPU
+	       clients is starting from 0x30 based on PECI specification.
+
+Example:
+	peci-bus@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		< more properties >
+
+		peci-client@30 {
+			compatible = "intel,peci-client";
+			reg = <0x30>;
+		};
+
+		peci-client@31 {
+			compatible = "intel,peci-client";
+			reg = <0x31>;
+		};
+	};
-- 
2.17.0