linux-kernel - Re: [PATCH 00/16] i2c: drop class based instantiaion for selected drivers

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Date:	Wed, 16 Jul 2014 19:46:05 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-i2c@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org,
	adi-buildroot-devel@...ts.sourceforge.net,
	davinci-linux-open-source@...ux.davincidsp.com,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 00/16] i2c: drop class based instantiaion for selected
 drivers

On Thu, Jul 10, 2014 at 01:46:20PM +0200, Wolfram Sang wrote:
> Some drivers were flagged to remove class based instantiation soon to improve
> boot-up time. Originally, I was planning for a longer deprecation time so users
> could switch over to some other kind of instantiation. However, the demand for
> the speed up is high enough and class based instantiation is used rarely, so
> the removal takes place now. To make up for the deprecation time, another
> warning is added to the i2c core pointing out that the behaviour has now
> changed:
> 
> +	/* Warn that the adapter lost class based instantiation */
> +	if (adapter->class == I2C_CLASS_DEPRECATED) {
> +		dev_dbg(&adapter->dev,
> +			"This adapter dropped support for I2C classes and "
> +			"won't auto-detect %s devices anymore. If you need it, check "
> +			"'Documentation/i2c/instantiating-devices' for alternatives.\n",
> +			driver->driver.name);
> +		return 0;
> +	}
> 
> A branch can be found here (with two other cleanups -> driver removals):
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/deprecate_stuff
> 
> I hope this meets all the needs. Please comment, ack, test...
> 
> Thanks,
> 
>    Wolfram
> 
> 
> Wolfram Sang (16):
>   i2c: add debug info when class instantiation was dropped
>   i2c: i2c-at91: Drop class based scanning to improve bootup time
>   i2c: i2c-bcm2835: Drop class based scanning to improve bootup time
>   i2c: i2c-bfin-twi: Drop class based scanning to improve bootup time
>   i2c: i2c-davinci: Drop class based scanning to improve bootup time
>   i2c: i2c-designware-platdrv: Drop class based scanning to improve
>     bootup time
>   i2c: i2c-mv64xxx: Drop class based scanning to improve bootup time
>   i2c: i2c-nomadik: Drop class based scanning to improve bootup time
>   i2c: i2c-ocores: Drop class based scanning to improve bootup time
>   i2c: i2c-omap: Drop class based scanning to improve bootup time
>   i2c: i2c-rcar: Drop class based scanning to improve bootup time
>   i2c: i2c-s3c2410: Drop class based scanning to improve bootup time
>   i2c: i2c-sirf: Drop class based scanning to improve bootup time
>   i2c: i2c-stu300: Drop class based scanning to improve bootup time
>   i2c: i2c-tegra: Drop class based scanning to improve bootup time
>   i2c: i2c-xiic: Drop class based scanning to improve bootup time
> 
>  drivers/i2c/busses/i2c-at91.c               |  2 +-
>  drivers/i2c/busses/i2c-bcm2835.c            |  2 +-
>  drivers/i2c/busses/i2c-bfin-twi.c           |  2 +-
>  drivers/i2c/busses/i2c-davinci.c            |  2 +-
>  drivers/i2c/busses/i2c-designware-platdrv.c |  2 +-
>  drivers/i2c/busses/i2c-mv64xxx.c            |  2 +-

Applied to for-next, thanks!


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