Hi Lee,
On 22/09/15 21:34, Lee Jones wrote:
On Mon, 21 Sep 2015, Emilio López wrote:
Some EC implementations include a small nvram space used to store
verified boot context data. This boolean property lets us indicate
whether this space is available or not on a specific EC implementation.
Signed-off-by: Emilio López <emilio.lopez@xxxxxxxxxxxxxxx>
---
Patch is new in v3, split from 3/4
Documentation/devicetree/bindings/mfd/cros-ec.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/mfd/cros-ec.txt b/Documentation/devicetree/bindings/mfd/cros-ec.txt
index 1777916..136e0c2 100644
--- a/Documentation/devicetree/bindings/mfd/cros-ec.txt
+++ b/Documentation/devicetree/bindings/mfd/cros-ec.txt
@@ -34,6 +34,10 @@ Required properties (LPC):
- compatible: "google,cros-ec-lpc"
- reg: List of (IO address, size) pairs defining the interface uses
+Optional properties (all):
+- google,has-vbc-nvram: Some implementations of the EC include a small
+ nvram space used to store verified boot context data. This boolean flag
+ is used to specify whether this nvram is present or not.
Is there no way to check for this at runtime?
You can issue a read and see if it succeeds, but the problem is that
some EC implementations return success even when they don't implement
the functionality.
Cheers,
Emilio
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