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Documentation: dt: Add binding for /secure-chosen/stdout-path

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Some platforms may use a single device tree to describe two address
spaces, as described in d9f43babb9 ("Documentation: dt: Add bindings
for Secure-only devices"). For these platforms it makes sense to define
a secure counterpart of /chosen, namely: /secure-chosen. This new node
is meant to be used by the secure firmware to pass data to the secure
OS. Only the stdout-path property is supported for now.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Jerome Forissier 2018-10-08 18:16:42 +08:00 committed by Rob Herring
parent d81cc4a8e4
commit 22a7488c54
1 changed files with 18 additions and 1 deletions
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19
Documentation/devicetree/bindings/arm/secure.txt
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@ -32,7 +32,8 @@ describe the view of Secure world using the standard bindings. These
secure- bindings only need to be used where both the Secure and Normal secure- bindings only need to be used where both the Secure and Normal
world views need to be described in a single device tree. world views need to be described in a single device tree.
Valid Secure world properties: Valid Secure world properties
-----------------------------
- secure-status : specifies whether the device is present and usable - secure-status : specifies whether the device is present and usable
in the secure world. The combination of this with "status" allows in the secure world. The combination of this with "status" allows
@ -51,3 +52,19 @@ Valid Secure world properties:
status = "disabled"; secure-status = "okay"; /* S-only */ status = "disabled"; secure-status = "okay"; /* S-only */
status = "disabled"; /* disabled in both */ status = "disabled"; /* disabled in both */
status = "disabled"; secure-status = "disabled"; /* disabled in both */ status = "disabled"; secure-status = "disabled"; /* disabled in both */
The secure-chosen node
----------------------
Similar to the /chosen node which serves as a place for passing data
between firmware and the operating system, the /secure-chosen node may
be used to pass data to the Secure OS. Only the properties defined
below may appear in the /secure-chosen node.
- stdout-path : specifies the device to be used by the Secure OS for
its console output. The syntax is the same as for /chosen/stdout-path.
If the /secure-chosen node exists but the stdout-path property is not
present, the Secure OS should not perform any console output. If
/secure-chosen does not exist, the Secure OS should use the value of
/chosen/stdout-path instead (that is, use the same device as the
Normal world OS).