From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sudeep Holla Subject: Re: [PATCH] ARM: arm64: dts: Add expansion bus to VExpress and Juno Date: Mon, 4 Apr 2016 18:05:11 +0100 Message-ID: <57029EC7.8030802@arm.com> References: <1459786850-29409-1-git-send-email-brian.starkey@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1459786850-29409-1-git-send-email-brian.starkey-5wv7dgnIgG8@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Brian Starkey Cc: Liviu Dudau , Lorenzo Pieralisi , Sudeep Holla , Rob Herring , Pawel Moll , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: sudeep.holla@arm.com (Sudeep Holla) Date: Mon, 4 Apr 2016 18:05:11 +0100 Subject: [PATCH] ARM: arm64: dts: Add expansion bus to VExpress and Juno In-Reply-To: <1459786850-29409-1-git-send-email-brian.starkey@arm.com> References: <1459786850-29409-1-git-send-email-brian.starkey@arm.com> Message-ID: <57029EC7.8030802@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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