linux-kernel - Re: [PATCH 8/8] staging: vme: make match() driver specific to improve non-VME64x support

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Message-ID: <4E3911E7.10401@ge.com>
Date:	Wed, 03 Aug 2011 10:16:23 +0100
From:	Martyn Welch <martyn.welch@...com>
To:	Manohar Vanga <manohar.vanga@...n.ch>
CC:	gregkh@...e.de, cota@...ap.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] staging: vme: make match() driver specific to improve
 non-VME64x support

On 01/08/11 11:20, Manohar Vanga wrote:
> For jumper based boards (non VME64x), there is no mechanism
> for detecting the card that is plugged into a specific slot. This
> leads to issues in non-autodiscovery crates/cards when a card is
> plugged into a slot that is "claimed" by a different driver. In
> reality, there is no problem, but the driver rejects such a
> configuration due to its dependence on the concept of slots.
> 
> This patch makes the concept of slots less critical and pushes the
> driver match() to individual drivers (similar to what happens in the
> ISA bus in driver/base/isa.c). This allows drivers to register the
> number of devices that they expect without any restrictions. Devices
> in this new model are now formatted as $driver_name-$bus_id.$device_id
> (as compared to the earlier vme-$bus_id.$slot_number).
> 

I haven't got any hardware old enough to hand to play with how ISA devices get
bound into the device model. I was thinking that we may be able to do
vme-$bus_id.$device_id, but this would require the $device_id to be unique per
bus, which isn't an issue on buses such as PCI (or I guess USB) where such
enumeration is built into the spec. With the exception of VME64x, which I
guess we should really be treating as a special case (I guess most cards in
actual use don't follow this standard), we are much closer to the ISA bus. I
assume that $driver_name-$bus_id.$device_id is roughly in line with how ISA
would do this (IIRC, ther would only ever be one ISA bus on a board, so the
bus entry wouldn't be needed, but we clearly need this)?

Martyn

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