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From: Sudeep Holla <sudeep.holla-5wv7dgnIgG8@public.gmane.org>
To: Brian Starkey <brian.starkey-5wv7dgnIgG8@public.gmane.org>
Cc: Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>,
	Lorenzo Pieralisi
	<lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>,
	Sudeep Holla <sudeep.holla-5wv7dgnIgG8@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] ARM: arm64: dts: Add expansion bus to VExpress and Juno
Date: Mon, 4 Apr 2016 18:05:11 +0100	[thread overview]
Message-ID: <57029EC7.8030802@arm.com> (raw)
In-Reply-To: <1459786850-29409-1-git-send-email-brian.starkey-5wv7dgnIgG8@public.gmane.org>



On 04/04/16 17:20, Brian Starkey wrote:
> The VExpress and Juno development platforms have an external expansion
> bus which can be used for additional hardware (e.g. LogicTile Express
> daughterboards).

How do you plan to add those additional hardware on the expansion bus ?

IIUC having them in DT and running on a system without the tile
connected will cause aborts, hence you are just adding bus definition.

Is there any use in having just the bus definition in DT. If you are
planning to add devices using overlays, can't the bus definition also
be added then ?

I am fine with the patch as such, just wanted to know the information.

-- 
Regards,
Sudeep
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WARNING: multiple messages have this Message-ID (diff)
From: sudeep.holla@arm.com (Sudeep Holla)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: arm64: dts: Add expansion bus to VExpress and Juno
Date: Mon, 4 Apr 2016 18:05:11 +0100	[thread overview]
Message-ID: <57029EC7.8030802@arm.com> (raw)
In-Reply-To: <1459786850-29409-1-git-send-email-brian.starkey@arm.com>



On 04/04/16 17:20, Brian Starkey wrote:
> The VExpress and Juno development platforms have an external expansion
> bus which can be used for additional hardware (e.g. LogicTile Express
> daughterboards).

How do you plan to add those additional hardware on the expansion bus ?

IIUC having them in DT and running on a system without the tile
connected will cause aborts, hence you are just adding bus definition.

Is there any use in having just the bus definition in DT. If you are
planning to add devices using overlays, can't the bus definition also
be added then ?

I am fine with the patch as such, just wanted to know the information.

-- 
Regards,
Sudeep

  parent reply	other threads:[~2016-04-04 17:05 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-04 16:20 [PATCH] ARM: arm64: dts: Add expansion bus to VExpress and Juno Brian Starkey
2016-04-04 16:20 ` Brian Starkey
     [not found] ` <1459786850-29409-1-git-send-email-brian.starkey-5wv7dgnIgG8@public.gmane.org>
2016-04-04 16:54   ` Liviu Dudau
2016-04-04 16:54     ` Liviu Dudau
2016-04-04 17:05   ` Sudeep Holla [this message]
2016-04-04 17:05     ` Sudeep Holla
     [not found]     ` <57029EC7.8030802-5wv7dgnIgG8@public.gmane.org>
2016-04-05  8:14       ` Brian Starkey
2016-04-05  8:14         ` Brian Starkey

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