linux-kernel - Re: [PATCH 1/2] i2c: Add possibility for user-defined (i2c-)devices for bus-drivers.

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Date:	Tue, 13 Nov 2012 21:23:04 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Jean Delvare <khali@...ux-fr.org>
CC:	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	Till Harbaum <till@...baum.org>
Subject: Re: [PATCH 1/2] i2c: Add possibility for user-defined (i2c-)devices
 for bus-drivers.

Am 13.11.2012 19:55, schrieb Jean Delvare:
> On Tue, 13 Nov 2012 19:06:07 +0100, Alexander Holler wrote:
>> This makes it possible to define i2c-devices at the kernel command line
>> or as a module parameter for bus-drivers which want to offer such
>> an functionality.
>>
>> Drivers which are using it will have the a parameter named
>> devices with format devname1@...r1,devname2@...r2,...
>> e.g. devices=ds1307@...8,pcf8563@...1
>
> No, no, no. We did that 10 years ago, killed all the code 3 years ago
> [1], let's not do the same mistake again, please. We have a sysfs
> interface for instantiating clients dynamically from user-space, it's
> way more powerful and flexible than your proposal. Just try plugging two

So how do I define a device, e.g. an RTC which I want to have alive 
before userland starts? Currently imho not possible.

> different i2c-tiny-usb adapters on the same system and see the new code
> instantiate the wrong devices...

I know about that, but it probes and you don't have to use that 
parameter at all. I think some people can think for their self, 
especially those how would use such a parameter.

> [1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=7f508118b1c1f9856a1c899a2bd4867a962b0225

I think my patch looks nicier.

Alexander
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