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

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Message-ID: <20121113195533.6db71716@endymion.delvare>
Date:	Tue, 13 Nov 2012 19:55:33 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Alexander Holler <holler@...oftware.de>
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.

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

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

> The devices will be probed using the standard probe mechanism,
> the definition of up to 8 devices is allowed.
> 
> Cc: Jean Delvare <khali@...ux-fr.org>
> Cc: Till Harbaum <till@...baum.org>
> Signed-off-by: Alexander Holler <holler@...oftware.de>
> ---
>  Documentation/i2c/instantiating-devices | 37 ++++++++++++++++++++++++++++++
>  drivers/i2c/i2c-core.c                  | 40 +++++++++++++++++++++++++++++++++
>  include/linux/i2c.h                     | 14 ++++++++++++
>  3 files changed, 91 insertions(+)
> (...)

-- 
Jean Delvare
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