From: Tomasz Figa <tfiga@chromium.org>
To: Shunqian Zheng <zhengsq@rock-chips.com>
Cc: "Joerg Roedel" <joro@8bytes.org>,
"Heiko Stübner" <heiko@sntech.de>,
"Rob Herring" <robh+dt@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
linux@armlinux.org.uk, 姚智情 <mark.yao@rock-chips.com>,
"David Airlie" <airlied@linux.ie>,
"simon xue" <xxm@rock-chips.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"open list:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
devicetree@vger.kernel.org,
dri-devel <dri-devel@lists.freedesktop.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"open list:ARM/Rockchip SoC..."
<linux-rockchip@lists.infradead.org>
Subject: Re: [PATCH v2 4/7] ARM: dts: rockchip: add virtual iommu for display
Date: Fri, 10 Jun 2016 15:22:56 +0900 [thread overview]
Message-ID: <CAAFQd5AU2xV98bAEDvPpV1-5ED3oCMgp9vuTymX-RpWFVhH=mw@mail.gmail.com> (raw)
In-Reply-To: <1465392392-2003-5-git-send-email-zhengsq@rock-chips.com>
Hi,
On Wed, Jun 8, 2016 at 10:26 PM, Shunqian Zheng <zhengsq@rock-chips.com> wrote:
> An virtual iommu without reg or interrupts for display.
> Adding this according to iommu driver changes.
>
> Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
> ---
> arch/arm/boot/dts/rk3288.dtsi | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 7fa932f..4cd535f 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -219,9 +219,15 @@
> clock-names = "timer", "pclk";
> };
>
> + display_mmu: virtual-iommu {
> + compatible = "rockchip,iommu";
> + #iommu-cells = <0>;
> + };
> +
Device tree should describe real hardware and so it isn't really a
good idea to add such virtual iommu, especially using a compatible
string of a real device.
Please see my comments to patch 3/7 for an alternative idea.
Best regards,
Tomasz
next prev parent reply other threads:[~2016-06-10 6:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-08 13:26 [PATCH v2 0/7] fix bugs; enable iommu for ARM64 Shunqian Zheng
2016-06-08 13:26 ` [PATCH v2 1/7] iommu/rockchip: fix devm_{request,free}_irq parameter Shunqian Zheng
2016-06-10 5:30 ` Tomasz Figa
2016-06-08 13:26 ` [PATCH v2 2/7] iommu/rockchip: add map_sg callback for rk_iommu_ops Shunqian Zheng
2016-06-10 5:31 ` Tomasz Figa
2016-06-08 13:26 ` [PATCH v2 3/7] iommu/rockchip: support virtual iommu slave device Shunqian Zheng
2016-06-10 6:22 ` Tomasz Figa
2016-06-08 13:26 ` [PATCH v2 4/7] ARM: dts: rockchip: add virtual iommu for display Shunqian Zheng
2016-06-10 6:22 ` Tomasz Figa [this message]
2016-06-08 13:26 ` [PATCH v2 5/7] drm: rockchip: use common iommu api to attach iommu Shunqian Zheng
2016-06-10 8:03 ` Tomasz Figa
2016-06-08 13:26 ` [PATCH v2 6/7] iommu/rockchip: use DMA API to map, to flush cache Shunqian Zheng
2016-06-10 9:10 ` Tomasz Figa
[not found] ` <575E834C.30305@gmail.com>
2016-06-13 10:21 ` Tomasz Figa
[not found] ` <575E8B6F.1040103@gmail.com>
2016-06-13 10:41 ` Tomasz Figa
2016-06-13 10:39 ` Robin Murphy
2016-06-08 13:26 ` [PATCH v2 7/7] iommu/rockchip: enable rockchip iommu on ARM64 platform Shunqian Zheng
2016-06-10 9:12 ` Tomasz Figa
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