linux-kernel - Re: [PATCH v8 11/14] iommu/rockchip: Use OF

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Date:   Wed, 04 Apr 2018 19:10:20 +0800
From:   JeffyChen <jeffy.chen@...k-chips.com>
To:     Daniel Kurtz <djkurtz@...omium.org>
CC:     linux-kernel@...r.kernel.org, Ricky Liang <jcliang@...omium.org>,
        Robin Murphy <robin.murphy@....com>, xxm <xxm@...k-chips.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 11/14] iommu/rockchip: Use OF_IOMMU to attach devices
 automatically

Hi Daniel,

Thanks for your reply.

On 04/04/2018 12:11 AM, Daniel Kurtz wrote:
> Hi Jeffy,
>
> Sorry for delayed response.
>
> On Mon, Mar 26, 2018 at 1:58 AM JeffyChen <jeffy.chen@...k-chips.com> wrote:
>
>> Hi Daniel,
>
>> Thanks for your reply.
>
>> On 03/26/2018 02:31 PM, Daniel Kurtz wrote:
>>>>> +struct rk_iommudata {
>>>>> +       struct rk_iommu *iommu;
>>>>> +};
>>> Why do we need this struct?  Can't we just assign a pointer to struct
>>> rk_iommu directly to dev->archdata.iommu?
>>>
>> hmmm, i was trying to add more device related data in patch[13]:
>
>>     struct rk_iommudata {
>> +       struct device_link *link; /* runtime PM link from IOMMU to master
> */
>>           struct rk_iommu *iommu;
>>     };
>>>
>
> Can't you just add link to rk_iommu directly?

adding link to rk_iommu would be fine if we only have one master device 
per rk_iommu.

but now we are supporting multiple master devices sharing a iommu device :)

>
>
>