linux-kernel - driver model, duplicate names question

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Date:	Tue, 16 Jul 2013 09:34:57 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	gregkh@...uxfoundation.org
CC:	"Brown, Len" <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: driver model, duplicate names question

Hi Greg,

I would like to create tree like structure using device model (struct 
device, device_register/device_unregister) using parent/child 
relationship while creation. I want to be able to create duplicate 
names, when their parents are different, similar to a directory structure.
I see that I can't create devices with duplicate names (device names), 
even when their parents are different.

How can I allow duplicate names when their parents are different devices?
I want to avoid flat model as I have parent child relationship and there 
will be too many devices using flat model.

Why, I need?
I am going to publish RFC for a new power cap class driver. We have a 
multiple controllers under power cap class (they are devices). Under 
which there are multiple power zones, with parent/child relationships. 
Currently I have to use  kobject_init_and_add, which I want to avoid and 
just use device_register. Other places, wherever such relationships are 
required, kobjects are used like cpufreq.

Thanks,
Srinivas Pandruvada
Open Source Technology Center,
Intel Corp.

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