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

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Date:   Tue, 03 Apr 2018 16:11:49 +0000
From:   Daniel Kurtz <djkurtz@...omium.org>
To:     Jeffy <jeffy.chen@...k-chips.com>
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>,
        open@....net, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 11/14] iommu/rockchip: Use OF_IOMMU to attach devices automatically

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?