linux-kernel - [PATCHv1] dt-bindings: misc: add Intel Stratix10 service layer binding

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Date:   Tue, 23 Jan 2018 13:25:02 -0600
From:   richard.gong@...ux.intel.com
To:     robh+dt@...nel.org, mark.rutland@....com
Cc:     richard.gong@...el.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCHv1] dt-bindings: misc: add Intel Stratix10 service layer binding

From: Richard Gong <richard.gong@...el.com>

Add a device tree binding for the Intel Stratix10 service layer driver

Signed-off-by: Richard Gong <richard.gong@...el.com>
---
 .../devicetree/bindings/misc/intel-service.txt     | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/intel-service.txt

diff --git a/Documentation/devicetree/bindings/misc/intel-service.txt b/Documentation/devicetree/bindings/misc/intel-service.txt
new file mode 100644
index 0000000..254e4a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/intel-service.txt
@@ -0,0 +1,56 @@
+Intel Service Layer Driver for Stratix10 SoC
+============================================
+Intel Stratix10 SoC is composed of a 64 bit quad-core ARM Cortex A53 hard
+processor system (HPS) and Secure Device Manager (SDM). When the FPGA is
+configured from HPS, there needs to be a way for HPS to notify SDM the
+location and size of the configuration data. Then SDM will get the
+configuration data from that location and perform the FPGA configuration.
+
+To meet the whole system security needs and support virtual machine requesting
+communication with SDM, only the secure world of software (EL3, Exception
+Layer 3) can interface with SDM. All software entities running on other
+exception layers must channel through the EL3 software whenever it needs
+service from SDM.
+
+Intel Stratix10 service layer driver, running at privileged exception level
+(EL1, Exception Layer 1), interfaces with the service providers and provides
+the services for FPGA configuration, QSPI, Crypto and warm reset. Service layer
+driver also manages secure monitor call (SMC) to communicate with secure monitor
+code running in EL3.
+
+Required properties:
+--------------------
+The following are the mandatory properties:
+
+- compatible:
+		"intc,svc-1.0"
+- method:
+		smc or hvc
+			smc - Secure Monitor Call
+			hvc - Hypervisor Call
+- memory-region:
+		phandle to the reserved memory node. See
+		Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
+		for details
+
+Example:
+--------
+
+	reserved-memory {
+                #address-cells = <2>;
+                #size-cells = <2>;
+                ranges;
+
+                service_reserved: svcbuffer@0 {
+                        compatible = "shared-dma-pool";
+                        reg = <0x0 0x0 0x0 0x1000000>;
+                        alignment = <0x1000>;
+                        no-map;
+                };
+        };
+
+	svc {
+		compatible = "intc,svc-1.0";
+		method = "smc";
+		memory-region = <&service_reserved>
+	};
-- 
2.7.4