linux-kernel - Re: [PATCH 3/8 v2] ARM OMAP2+ GPMC: add bus children

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Date:	Wed, 25 Feb 2015 18:18:38 +0200
From:	Roger Quadros <rogerq@...com>
To:	<rabel@...-ec.uni-bielefeld.de>, <linux-omap@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <tony@...mide.com>,
	<linux@....linux.org.uk>
Subject: Re: [PATCH 3/8 v2] ARM OMAP2+ GPMC: add bus children

Robert,

On 25/02/15 17:06, Robert Abel wrote:
> Hi Roger,
> 
> On 25 Feb 2015 13:02, Roger Quadros wrote:
>> This creates platform devices for the children of child, but what about platform device for the child itself?
> It seems my first try in the other patch set wasn't so wrong after all. Maybe unconditionally call
> 
> of_platform_device_create(child,...) and
> of_platform_populate(child, ...)?
> 
>> Shouldn't the bus driver for that bus be responsible for spawning children of its bus?
> Well, a bus driver doesn't actually do much work here. The standard buses are just there for offset and so on.
> And that's my use case. Have one CS region with fixed settings and multiple devices in it.
> 
> Creating code that in effect replicates what simple-bus does isn't worthwhile. Basically, it would replicate half the code that
> of_platform_populate goes through anyway without good reason.
> 
> If complex bus-behavior is needed -- more than single-bus offset shifts --, a complex bus driver can always be written.
> Since it wouldn't match of_default_match_table, it itself would be responsible for creating children.
> 
> I think I'll go with my first patch for this one, maybe call of_platform_decide_create unconditionally to check whether buses are
> available.

OK. Would be interesting to see how unconditional call to of_platform_decide_create() behaves
for your case.

cheers,
-roger
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