linux-kernel - Re: [PATCH v2 11/13] iommu/rockchip: Use OF

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Message-ID: <CAAFQd5C=SM21CmL8J334HseJ6SJH1wAVzKhrsk_cXMmpf8mK8g@mail.gmail.com>
Date:   Wed, 17 Jan 2018 14:44:26 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, Ricky Liang <jcliang@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        simon xue <xxm@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 11/13] iommu/rockchip: Use OF_IOMMU to attach devices automatically

On Tue, Jan 16, 2018 at 10:25 PM, Jeffy Chen <jeffy.chen@...k-chips.com> wrote:
> Converts the rockchip-iommu driver to use the OF_IOMMU infrastructure,
> which allows attaching master devices to their IOMMUs automatically
> according to DT properties.
>
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> ---
>
> Changes in v2: None
>
>  drivers/iommu/rockchip-iommu.c | 116 +++++++++++------------------------------
>  1 file changed, 31 insertions(+), 85 deletions(-)
>
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index 51e4f982c4a6..c2d3ac82184e 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
[snip]
> +static int rk_iommu_of_xlate(struct device *dev,
> +                            struct of_phandle_args *args)
> +{
> +       struct platform_device *iommu_dev;
> +
> +       iommu_dev = of_find_device_by_node(args->np);
> +       if (!iommu_dev) {
> +               dev_err(dev, "iommu %pOF not found\n", args->np);
> +               return -ENODEV;
> +       }
> +
> +       dev->archdata.iommu = platform_get_drvdata(iommu_dev);

This will work only if that iommu was already probed. Do we have any
guarantees that this callback is not called earlier?

Best regards,
Tomasz