linux-kernel - Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

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Date:	Mon, 22 Aug 2011 15:47:14 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	sdharia@...eaurora.org
Cc:	"Mark Brown" <broonie@...nsource.wolfsonmicro.com>,
	"Kenneth Heitke" <kheitke@...eaurora.org>,
	"David Brown" <davidb@...eaurora.org>, bryanh@...eaurora.org,
	linux-arm-msm@...r.kernel.org, rdunlap@...otime.net,
	rmk+kernel@....linux.org.uk, john.stultz@...aro.org,
	akpm@...ux-foundation.org, ohad@...ery.com, gregkh@...e.de,
	stefanr@...6.in-berlin.de, lethal@...ux-sh.org,
	linville@...driver.com, zajec5@...il.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

On Monday 22 August 2011, Sagar Dharia wrote:
> Another suggestion about probe is having callback to notify when the
> device is ready-to-use after driver probe powers it up. I will change the
> framework accordingly to have this done.

Is this actually needed? If the driver is responsible for powering up the
device, maybe it's enough to have a simple exported function from the
framework that blocks until the device has been probed, using a
'completion' or a similar wait_event() based primitive for waiting for
the device:

1. The bus driver creates the struct slim_device in one of the three ways
   mentioned and does init_completion().
2. The probe function of the driver ensures that the regulators/clocks/...
   are set up correctly and then calls wait_for_completion()
3. When the device shows up on the bus, the slimbus layer calls complete().

Steps 2 and 3 can happen in any order.

	Arnd
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