linux-kernel - Re: [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or ACPI'ed devices

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Message-ID: <20140530125543.GA29731@lee--X1>
Date:	Fri, 30 May 2014 13:55:43 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	grant.likely@...aro.org, linus.walleij@...aro.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or
 ACPI'ed devices

On Fri, 30 May 2014, Wolfram Sang wrote:

> On Fri, May 30, 2014 at 01:26:36PM +0100, Lee Jones wrote:
> > Currently the I2C framework insists on devices supplying an I2C ID
> > table.  Many of the devices which do so unnecessarily adding quite a
> > few wasted lines to kernel code.  This patch allows drivers a means
> > to 'not' supply the aforementioned table and match on either DT
> > and/or ACPI match tables instead.
> > 
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> 
> Sadly, it is not that easy...
> 
> > +	/*
> > +	 * An I2C ID table is not madatory, if and only if, a suitable Device
> > +	 * Tree and/or ACPI match table entry is supplied for the probing
> > +	 * device.
> > +	 */
> 
> That means we end up with drivers which cannot be used for run-time
> instantiation via the 'new_device'-file in sysfs. I don't like that.

Would you mind explaining that a little please?  And perhaps point me
to the code?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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