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

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Message-ID: <53AB46E0.5010908@wwwdotorg.org>
Date:	Wed, 25 Jun 2014 16:02:08 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Bresticker <abrestic@...omium.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...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>,
	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 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?
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