linux-kernel - Re: [PATCH] spi/spi_s3c64xx: Move to subsys

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Date:	Wed, 8 Sep 2010 10:12:43 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Jassi Brar <jassisinghbrar@...il.com>
Cc:	Jassi Brar <jassi.brar@...sung.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	spi-devel-general@...ts.sourceforge.net,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi/spi_s3c64xx: Move to subsys_initcall()

On Wed, Sep 08, 2010 at 01:55:39PM +0900, Jassi Brar wrote:
> On Tue, Sep 7, 2010 at 7:29 PM, Mark Brown
> <broonie@...nsource.wolfsonmicro.com> wrote:
> > Allow the use of the S3C64xx SPI controller with things like PMICs by
> > moving the init up to subsys_initcall().

> Couldn't any user ever need to load it as a module?
> If no, we might as well drop the s3c64xx_spi_exit and s3c64xx_spi_remove

This doesn't prevent building as a module - when built as a module
subsys_initcall() is identical to module_init(), the change will only
affect the order in which things are done when the code is built into
the kernel otherwise it's a noop.

> as well and save space. Rather going a step further, shouldn't then all
> spi drivers be that way? Two steps further, why not every 'bus-driver' ?

Yes, we probably do need to do the same thing for all embedded SPI
controllers (as has already happened with embedded I2C controllers),
though it's less pressing since outside of a few CPUs it's much less
common for things like PMICs to be on SPI than I2C.
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