linux-kernel - Re: [PATCH 3/3] iommu/ipmmu-vmsa: Hook up r8a7796 DT matching code

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Date:	Wed, 8 Jun 2016 17:05:30 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	iommu@...ts.linux-foundation.org,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Joerg Roedel <joro@...tes.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-renesas-soc@...r.kernel.org,
	Simon Horman <horms+renesas@...ge.net.au>
Subject: Re: [PATCH 3/3] iommu/ipmmu-vmsa: Hook up r8a7796 DT matching code

Hi Geert,

On Wed, Jun 8, 2016 at 4:04 PM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> Hi Laurent,
>
> On Wed, Jun 8, 2016 at 2:18 AM, Laurent Pinchart
> <laurent.pinchart@...asonboard.com> wrote:
>>> --- 0031/drivers/iommu/ipmmu-vmsa.c
>>> +++ work/drivers/iommu/ipmmu-vmsa.c   2016-06-06 11:19:40.210607110 +0900
>>> @@ -1074,7 +1074,7 @@ static const struct ipmmu_features ipmmu
>>>       .twobit_imttbcr_sl0 = false,
>>>  };
>>>
>>> -static const struct ipmmu_features ipmmu_features_r8a7795 = {
>>> +static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
>>>       .use_ns_alias_offset = false,
>>>       .has_cache_leaf_nodes = true,
>>>       .has_eight_ctx = true,
>>> @@ -1088,7 +1088,10 @@ static const struct of_device_id ipmmu_o
>>>               .data = &ipmmu_features_default,
>>>       }, {
>>>               .compatible = "renesas,ipmmu-r8a7795",
>>> -             .data = &ipmmu_features_r8a7795,
>>> +             .data = &ipmmu_features_rcar_gen3,
>>> +     }, {
>>> +             .compatible = "renesas,ipmmu-r8a7796",
>>> +             .data = &ipmmu_features_rcar_gen3,
>>>       }, {
>>>               /* Terminator */
>>>       },
>>> @@ -1268,6 +1271,8 @@ IOMMU_OF_DECLARE(ipmmu_vmsa_iommu_of, "r
>>>                ipmmu_vmsa_iommu_of_setup);
>>>  IOMMU_OF_DECLARE(ipmmu_r8a7795_iommu_of, "renesas,ipmmu-r8a7795",
>>>                ipmmu_vmsa_iommu_of_setup);
>>> +IOMMU_OF_DECLARE(ipmmu_r8a7796_iommu_of, "renesas,ipmmu-r8a7796",
>>> +              ipmmu_vmsa_iommu_of_setup);
>>
>> How about a Gen3 generic compatible string in addition to the SoC-specific
>> ones ?
>
> Do we want to specify the number of utlbs here?
> Does it differ between r8a7795, r8a7796, and future members?

The utlb number is already a property of the SoC part number. So I
don't see why we want to encode this as a separate DT property instead
of going with an in-driver feature flag.

Thanks,

/ magnus