linux-kernel - Re: [PATCH v1 2/9] mailbox: Add NVIDIA Tegra XUSB mailbox driver

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Message-ID: <CAL1qeaH+pfyJKQyS3=7M7C6QGFkm3r5ssDohur7KUwk2EXG2tA@mail.gmail.com>
Date:	Wed, 25 Jun 2014 16:07:53 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-usb@...r.kernel.org,
	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>,
	Randy Dunlap <rdunlap@...radead.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>,
	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>,
	Kishon Vijay Abraham I <kishon@...com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1 2/9] mailbox: Add NVIDIA Tegra XUSB mailbox driver

On Wed, Jun 25, 2014 at 3:02 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 06/18/2014 12:16 AM, Andrew Bresticker wrote:
>> The Tegra XHCI controller communicates requests to the host through
>> a mailbox interface.  Host drivers which can handle these requests,
>> such as the Tegra XUSB pad controller driver and upcoming Tegra XHCI
>> host controller driver, can send messages and register to be notified
>> of incoming messages.
>
>> diff --git a/include/linux/tegra-xusb-mbox.h b/include/linux/tegra-xusb-mbox.h
>
>> +extern int tegra_xusb_mbox_register_notifier(struct tegra_xusb_mbox *mbox,
>> +                                          struct notifier_block *nb);
>> +extern void tegra_xusb_mbox_unregister_notifier(struct tegra_xusb_mbox *mbox,
>> +                                             struct notifier_block *nb);
>> +extern int tegra_xusb_mbox_send(struct tegra_xusb_mbox *mbox,
>> +                             enum tegra_xusb_mbox_cmd cmd, u32 data);
>> +extern struct tegra_xusb_mbox *
>> +tegra_xusb_mbox_lookup_by_phandle(struct device_node *np, const char *prop);
>
> This seems to use a custom API. I've seen mention of a mailbox
> subsystem, and I assume that has a standardized API. Should this driver
> implement that instead?

All the mailbox drivers currently use a custom API, but there is
indeed a patch series floating around to create a generic mailbox
framework, though it hasn't landed in -next yet.  I can take a look at
how this driver would fit into that framework.
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