Re: [PATCH v6 3/6] dt/bindings: add bindings for optee
From: Rob Herring <robh@kernel.org>
Date: 2015-11-16 17:01:20
Also in:
linux-arm-kernel, lkml
On Thu, Oct 29, 2015 at 09:21:25AM +0100, Jens Wiklander wrote:
quoted hunk ↗ jump to hunk
Introduces optee prefix and adds bindings for ARM TrustZone based OP-TEE implementation. Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> --- .../bindings/arm/firmware/optee,optee-tz.txt | 29 ++++++++++++++++++++++ .../devicetree/bindings/vendor-prefixes.txt | 1 + 2 files changed, 30 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/firmware/optee,optee-tz.txtdiff --git a/Documentation/devicetree/bindings/arm/firmware/optee,optee-tz.txt b/Documentation/devicetree/bindings/arm/firmware/optee,optee-tz.txt new file mode 100644 index 0000000..0a8ed0d --- /dev/null +++ b/Documentation/devicetree/bindings/arm/firmware/optee,optee-tz.txt@@ -0,0 +1,29 @@ +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. As there's no single OP-TEE +vendor we're using "optee" as the first part of compatible property, +indicating the OP-TEE protocol is used when communicating with the secure +world. + +* OP-TEE based on ARM TrustZone required properties: + +- compatible : should contain "optee,optee-tz"
I would leave off optee as a vendor. Different implementations by vendors should then add their vendor prefix as they all have the chance to screw-up something. I suppose we could do "linaro" as the reference implementation.
+ +- 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
The use here would be a guest VM calling thru to hypervisor and then hypervisor calling optee?
+
+
+
+Example:
+ optee {This should go under a /firmware node similar to Documentation/devicetree/bindings/arm/firmware/tlm,trusted-foundations.txt. Rob