linux-kernel - Re: [PATCH 1/4] documentation: add palmas dts definition

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Message-ID: <512FA9A1.7070701@wwwdotorg.org>
Date:	Thu, 28 Feb 2013 12:01:53 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Graeme Gregory <gg@...mlogic.co.uk>
CC:	Laxman Dewangan <ldewangan@...dia.com>,
	J Keerthy <j-keerthy@...com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"b-cousson@...com" <b-cousson@...com>
Subject: Re: [PATCH 1/4] documentation: add palmas dts definition

On 02/28/2013 03:57 AM, Graeme Gregory wrote:
...
> The final but of information that would be needed is some method to pass
> down product_id/design_rev and for a lot of the IP blocks they could be
> made independent of the actual parent.

That should probably be represented in DT itself as differing compatible
values.

I could see the argument that this is SW-probe-able since there's a
register that defines the value. However, any global ID register would
apply to the top-level device, and not the version of any child IP
blocks if there's the possibility of mixing/matching IP blocks. If
there's a dedicated version register for a child IP block, then
presumably it's already part of the child IP block's register space, and
so the driver can read it, and then there perhaps wouldn't be a need to
represent this using different compatible values.
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