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Date: Thu, 30 Aug 2012 13:08:09 +0200 From: Alexander Stein <alexander.stein@...tec-electronic.com> To: Feng Tang <feng.tang@...el.com> Cc: Jean Delvare <khali@...ux-fr.org>, linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org, "Ben Dooks (embedded platforms)" <ben-linux@...ff.org>, Tomoya MORINAGA <tomoya.rohm@...il.com> Subject: Re: i2c-eg20t: regression since i2c_add_numbered_adapter change 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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