On 08/25/2014 12:48 PM, Stephen Warren wrote:
On 08/18/2014 11:08 AM, Andrew Bresticker wrote:
Add device-tree bindings for the Tegra XUSB mailbox which will be used
for communication between the Tegra xHCI controller's firmware and the
host processor.
diff --git
a/Documentation/devicetree/bindings/mailbox/nvidia,tegra124-xusb-mbox.txt
b/Documentation/devicetree/bindings/mailbox/nvidia,tegra124-xusb-mbox.txt
+NVIDIA Tegra XUSB mailbox
+=========================
+
+The Tegra XUSB mailbox is used by the Tegra xHCI controller's
firmware to
+communicate requests to the host and PHY drivers.
+
+Required properties:
+--------------------
+ - compatible: Should be "nvidia,tegra124-xusb-mbox".
+ - reg: Address and length of the XUSB FPCI registers.
+ - interrupts: XUSB mailbox interrupt.
+ - #mbox-cells: Should be 1. The specifier is the index of the
mailbox to
+ reference. See <dt-bindings/mailbox/tegra-xusb-mailbox.h> for the
list
+ of valid values.
Is there a common mailbox binding somewhere? I couldn't find one. While
the text above specifies the value for #mbox-cells, it doesn't specify
the details of what the property is used for (i.e. there's no
documentation of the consumer-side of this property, for parsing the
mboxes property). Typically, that would be part of a subsystem's common
binding document, and that document would be referenced here.
Ah, I see it's still being developed. I found it at:
http://lkml.iu.edu/hypermail/linux/kernel/1408.0/00201.html
It would be good to mention that the semantics of this property are
defined by ../mailbox/mailbox.txt.
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