Re: [PATCH v2 1/9] of: Add NVIDIA Tegra XUSB mailbox binding

[Stephen Warren]

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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