linux-kernel - Re: [patch 1/5] Staging: VME Framework for the Linux Kernel

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Date:	Tue, 11 Aug 2009 16:49:14 +0200
From:	"Emilio G. Cota" <cota@...ap.org>
To:	Martyn Welch <martyn.welch@...anuc.com>
Cc:	Greg K-H <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org,
	Sebastien Dugue <sebastien.dugue@...l.net>
Subject: Re: [patch 1/5] Staging: VME Framework for the Linux Kernel

Martyn Welch wrote:
> Again: what part of the API I have defined forces the driver to know  
> about the underlying bridge?

Let me answer with another question, maybe we get to understand
each other this way:

Could you please explain me what happens when 17 different drivers
want to control 17 different devices, each on a different slot,
same address modifier, only 1MB per device? Apply if necessary
to the tsi148 bridge.

NB1. Any given driver knows nothing about the other devices
on the crate; each driver only knows about the address, am and
size of the mapping for the device it controls--user-space
provide this info on a per-driver basis.
NB2. The mapping offsets configured through the cards' pins match
the information passed from user space to each of the cards.

Cheers,
E.
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