linux-kernel - Re: [PATCH 2/3] soc: ti: Add wkup_m3

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Message-ID: <20150102203320.GF4920@saruman>
Date:	Fri, 2 Jan 2015 14:33:20 -0600
From:	Felipe Balbi <balbi@...com>
To:	Felipe Balbi <balbi@...com>
CC:	Dave Gerlach <d-gerlach@...com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Ohad Ben-Cohen <ohad@...ery.com>, Suman Anna <s-anna@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH 2/3] soc: ti: Add wkup_m3_ipc driver

On Fri, Jan 02, 2015 at 02:16:43PM -0600, Felipe Balbi wrote:
> On Fri, Jan 02, 2015 at 02:00:16PM -0600, Dave Gerlach wrote:
> > Introduce a wkup_m3_ipc driver to handle communication between the MPU
> > and Cortex M3 wkup_m3 present on am335x.
> > 
> > This driver is responsible for actually booting the wkup_m3_rproc and
> > also handling all IPC which is done using the IPC registers in the control
> > module, a mailbox, and a separate interrupt back from the wkup_m3. A small
> > API is exposed for executing specific power commands, which include
> > configuring for low power mode, request a transition to a low power mode,
> > and status info on a previous transition.

another comment is that no user of such API is provided, so it's very
difficult to verify that there's no other way of implementing this.

-- 
balbi

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