From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Stein Subject: Re: i2c-eg20t: regression since i2c_add_numbered_adapter change Date: Thu, 30 Aug 2012 13:08:09 +0200 Message-ID: <6208908.ZjG7eB9lJn@ws-stein> References: <4401854.hVfHzgeqjT@ws-stein> <4378288.tkkLiQ5MQ7@ws-stein> <20120830171915.36b6d10b@feng-i7> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <20120830171915.36b6d10b@feng-i7> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Feng Tang Cc: Jean Delvare , linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Ben Dooks (embedded platforms)" , Tomoya MORINAGA List-Id: linux-i2c@vger.kernel.org On Thursday 30 August 2012 17:19:15, Feng Tang wrote: > > IMO the i2c_register_board_info only works in quite static setups. Especially with I2C-Busses attached to hotplugable PCI devices this way doesn't work reliable any more. > > The device come and go dynamically so you can't assume fixed mapping. > > Can you specify the hotplugable? > 1. A hotplugable i2c bus controller (say i2c_eg20t) with all fixed i2c > devices connecting to it > 2. i2c bus controller is fixed, while the i2c devices will be dynamically > connected to it. > 3. Both the bus controller and devices are dynamically hotplugged I had scenario 1 in mind, but with more than 1 bus controller (say 2x i2c_eg20t). How can you set a fixed numbering if there are more controllers, each with maybe more than 1 bus? Anyway, how can you provide a static bus numbering if there are more than one driver or more than one device per driver if the devices are hotplugable? Best regards, Alexander