From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jae Hyun Yoo Subject: [PATCH linux-next v5 01/13] dt-bindings: Add a document of PECI subsystem Date: Fri, 1 Jun 2018 11:21:03 -0700 Message-ID: <20180601182103.23630-1-jae.hyun.yoo@linux.intel.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Rob Herring , Mark Rutland , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org Cc: Jae Hyun Yoo , Andrew Jeffery , Joel Stanley List-Id: devicetree@vger.kernel.org This commit adds a document of generic PECI bus, adapter and client driver. Signed-off-by: Jae Hyun Yoo Reviewed-by: Haiyue Wang Reviewed-by: James Feist Reviewed-by: Vernon Mauery Cc: Andrew Jeffery Cc: Joel Stanley --- .../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@10000000 { + 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