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From: "arnd-r2nGTMty4D4@public.gmane.org" <arnd-r2nGTMty4D4@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>,
	Laura Abbott <lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Cc: Laurent Pinchart
	<laurent.pinchart+renesas-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Mitchel Humpherys
	<mitchelh-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Marek Szyprowski
	<m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Joreg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>,
	Grant Likely
	<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH/RFC 0/4] Probe deferral for IOMMU DT integration
Date: Sat, 7 Feb 2015 23:41:24 +0100 (CET)	[thread overview]
Message-ID: <2115835102.210232.1423348884955.JavaMail.open-xchange@oxbaltgw04.schlund.de> (raw)
In-Reply-To: <1423182722-16646-1-git-send-email-lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

Laura Abbott <lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> hat am 6. Februar 2015 um 01:31
geschrieben:
>
> The requirement for this is based on a previous patch to add clock
> support to the ARM SMMU driver[2]. Once we have clock support, it's
> possible that the driver itself may need to be defered which breaks
> a bunch of assumptions about how SMMU probing is supposed to work.
 
Hi Laura,
 
I was hoping that we would not need this, and instead treat the iommu in
the same way as timers and SMP initialization, both
of which need to be run early at boot time but may rely on clock controllers
to be initialized first.
 
Is there a specific requirement that makes this impossible here, or is your
intention to solve the problem more nicely by allowing deferred probing
over forcing the input clocks of the iommu to be early?
 
      Arnd
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  parent reply	other threads:[~2015-02-07 22:41 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-06  0:31 [PATCH/RFC 0/4] Probe deferral for IOMMU DT integration Laura Abbott
     [not found] ` <1423182722-16646-1-git-send-email-lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-02-06  0:31   ` [PATCH/RFC 1/4] dma-mapping: Make arch_setup_dma_ops return an error code Laura Abbott
2015-02-06  0:32   ` [PATCH/RFC 2/4] of: Return error codes from of_dma_configure Laura Abbott
2015-02-06  0:32   ` [PATCH/RFC 3/4] iommu/arm-smmu: add support for specifying clocks Laura Abbott
2015-02-06  0:32   ` [PATCH/RFC 4/4] iommu/arm-smmu: Support deferred probing Laura Abbott
     [not found]     ` <1423182722-16646-5-git-send-email-lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-02-06 18:31       ` Robin Murphy
2015-02-07 22:41   ` arnd-r2nGTMty4D4 [this message]
2015-02-09 21:27     ` [PATCH/RFC 0/4] Probe deferral for IOMMU DT integration Laura Abbott
     [not found]     ` <2115835102.210232.1423348884955.JavaMail.open-xchange-h4m1HHXQYNGZU4JK52HgGMgmgJlYmuWJ@public.gmane.org>
2015-02-11  9:37       ` Marek Szyprowski
2015-02-16 16:14   ` Laurent Pinchart
2015-03-03 23:54     ` Laurent Pinchart
2015-03-04 15:25       ` Will Deacon
     [not found]         ` <20150304152505.GE17250-5wv7dgnIgG8@public.gmane.org>
2015-03-04 15:41           ` Laurent Pinchart
2015-03-04  9:20     ` Marek Szyprowski
     [not found]       ` <54F6CE64.8040503-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2015-05-12 10:01         ` Laurent Pinchart

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