dt/bindings: add bindings for optee

Introduces linaro prefix and adds bindings for ARM TrustZone based OP-TEE
implementation.

Change-Id: If4b626d0e8a14e2f1cdeac8aa0837e8ddc4dcbdd
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
(cherry picked from commit c8bfafb1594435889b571b79325011e8b7fd087b)
Signed-off-by: Victor Chong <victor.chong@linaro.org>

diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
new file mode 100644 (file)
index 0000000..d38834c
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
@@ -0,0 +1,31 @@
+OP-TEE Device Tree Bindings
+
+OP-TEE is a piece of software using hardware features to provide a Trusted
+Execution Environment. The security can be provided with ARM TrustZone, but
+also by virtualization or a separate chip.
+
+We're using "linaro" as the first part of the compatible property for
+the reference implementation maintained by Linaro.
+
+* OP-TEE based on ARM TrustZone required properties:
+
+- compatible     : should contain "linaro,optee-tz"
+
+- method         : The method of calling the OP-TEE Trusted OS. Permitted
+                   values are:
+
+                   "smc" : SMC #0, with the register assignments specified
+                          in drivers/tee/optee/optee_smc.h
+
+                   "hvc" : HVC #0, with the register assignments specified
+                          in drivers/tee/optee/optee_smc.h
+
+
+
+Example:
+       firmware {
+               optee {
+                       compatible = "linaro,optee-tz";
+                       method = "smc";
+               };
+       };

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 98dc175..7004fa9 100644 (file)
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -128,6 +128,7 @@ lacie       LaCie
 lantiq Lantiq Semiconductor
 lenovo Lenovo Group Ltd.
 lg     LG Corporation
+linaro Linaro Limited
 linux  Linux-specific binding
 lsi    LSI Corp. (LSI Logic)
 lltc   Linear Technology Corporation