linux-kernel - Re: [PATCH 5/7] ARM: dts: Complete data for isp iommu

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Date:	Mon, 23 Dec 2013 18:10:27 -0600
From:	"Anna, Suman" <s-anna@...com>
To:	<florian.vaussard@...l.ch>, Joerg Roedel <joro@...tes.org>,
	Tony Lindgren <tony@...mide.com>,
	Benoît Cousson <bcousson@...libre.com>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 5/7] ARM: dts: Complete data for isp iommu

Hi Florian,

On 12/23/2013 03:34 PM, Florian Vaussard wrote:
> Hi Suman,
>
> On 12/23/2013 08:12 PM, Anna, Suman wrote:
>> Hi Florian,
>>
>> On 12/17/2013 06:53 AM, Florian Vaussard wrote:
>>> Add missing information required to probe the iommu for the camera
>>> subsystem.
>>>
>>> Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>
>>> ---
>>>    arch/arm/boot/dts/omap3.dtsi | 4 +++-
>>>    1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/boot/dts/omap3.dtsi b/arch/arm/boot/dts/omap3.dtsi
>>> index daabf99..610d084 100644
>>> --- a/arch/arm/boot/dts/omap3.dtsi
>>> +++ b/arch/arm/boot/dts/omap3.dtsi
>>> @@ -371,11 +371,13 @@
>>>                dma-names = "tx", "rx";
>>>            };
>>>
>>> -        mmu_isp: mmu@...bd400 {
>>> +        mmu_isp: mmu_isp@...bd400 {
>>
>> Any reason for switching the name to mmu_isp?
>>
>
> The name of the hwmod is "mmu_isp". This was not working otherwise,
> but I cannot tell you for sure why without getting back at my office.

Ok, did a bit of digging, this is due to the name tie-in for iommu arch 
data (look at the omap3_camera_init in mach-omap2/devices.c), and the 
obj->name assignment of of->name. This is another thing that needs to be 
looked into since it would be preferable to move away from the name 
based lookup towards using a phandle approach by the iommu consumer drivers.

regards
Suman

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