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Commit 22a7488c authored by Jerome Forissier's avatar Jerome Forissier Committed by Rob Herring
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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 d9f43bab ("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: default avatarJerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent d81cc4a8

Documentation/devicetree/bindings/arm/secure.txt

+18 −1
Original line number Diff line number Diff line
@@ -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).