On Fri, Feb 07, 2020 at 10:08:36AM +0000, Marc Zyngier wrote:

On 2020-02-06 13:01, peng.fan@nxp.com wrote:

quoted

From: Peng Fan <peng.fan@nxp.com>

SCMI could use SMC/HVC as tranports, so add into devicetree
binding doc.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 Documentation/devicetree/bindings/arm/arm,scmi.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt

b/Documentation/devicetree/bindings/arm/arm,scmi.txt
index f493d69e6194..03cff8b55a93 100644

--- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
+++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt

@@ -14,7 +14,7 @@ Required properties:

 The scmi node with the following properties shall be under the

/firmware/ node.

-- compatible : shall be "arm,scmi"
+- compatible : shall be "arm,scmi" or "arm,scmi-smc"
 - mboxes: List of phandle and mailbox channel specifiers. It should
contain
 	  exactly one or two mailboxes, one for transmitting messages("tx")
 	  and another optional for receiving the notifications("rx") if

@@ -25,6 +25,8 @@ The scmi node with the following properties shall be

under the /firmware/ node.
 	  protocol identifier for a given sub-node.
 - #size-cells : should be '0' as 'reg' property doesn't have any size
 	  associated with it.
+- arm,smc-id : SMC id required when using smc transports
+- arm,hvc-id : HVC id required when using hvc transports

 Optional properties:

Not directly related to DT: Why do we need to distinguish between SMC and
HVC?

IIUC you want just one property to get the function ID ? Does that align
with what you are saying ? I wanted to ask the same question and I see
no need for 2 different properties.

Other SMC/HVC capable protocols are able to pick the right one based on the
PSCI conduit.

This make it clear, but I am asking to  be sure.

This is how the Spectre mitigations work already. Why is that any different?

I don't see any need for it to be different.

--
Regards,
Sudeep

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