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| author | Jerome Forissier <jerome.forissier@linaro.org> | 2018-10-08 12:16:42 +0200 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2018-10-12 22:44:12 +0200 |
| commit | 22a7488c54a03773ef7cf0dc952047c75cc1446a (patch) | |
| tree | 610beb4818dbf01b48a0889d59a34cf9bb695f49 | |
| parent | dt-bindings: arm: zte: Move sysctrl bindings to their own doc (diff) | |
| download | linux-22a7488c54a03773ef7cf0dc952047c75cc1446a.tar.xz linux-22a7488c54a03773ef7cf0dc952047c75cc1446a.zip | |
Documentation: dt: Add binding for /secure-chosen/stdout-path
Some platforms may use a single device tree to describe two address
spaces, as described in d9f43babb998 ("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>
| -rw-r--r-- | Documentation/devicetree/bindings/arm/secure.txt | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/arm/secure.txt b/Documentation/devicetree/bindings/arm/secure.txt index e31303fb233a..f27bbff2c780 100644 --- a/Documentation/devicetree/bindings/arm/secure.txt +++ b/Documentation/devicetree/bindings/arm/secure.txt @@ -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 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 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"; /* 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). |