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

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Date:	Mon, 25 Aug 2014 13:06:58 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Bresticker <abrestic@...omium.org>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-tegra@...r.kernel.org
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnd Bergmann <arnd@...db.de>,
	Kishon Vijay Abraham I <kishon@...com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/9] of: Add NVIDIA Tegra XUSB mailbox binding

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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