Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751618AbdDUEGU (ORCPT ); Fri, 21 Apr 2017 00:06:20 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:9487 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751422AbdDUEGS (ORCPT ); Fri, 21 Apr 2017 00:06:18 -0400 Message-ID: <1492747570.25908.36.camel@mtksdaap41> Subject: Re: [PATCH 1/3] dt-bindings: mt8173: Fix mdp device tree From: Minghsiu Tsai To: Rob Herring CC: Hans Verkuil , , "Mauro Carvalho Chehab" , Matthias Brugger , Daniel Kurtz , Pawel Osciak , Houlong Wei , , Eddie Huang , Yingjoe Chen , Wu-Cheng Li , , , , , Date: Fri, 21 Apr 2017 12:06:10 +0800 In-Reply-To: <20170419213540.4vigeed3mx24ie4e@rob-hp-laptop> References: <1492068787-17838-1-git-send-email-minghsiu.tsai@mediatek.com> <1492068787-17838-2-git-send-email-minghsiu.tsai@mediatek.com> <20170419213540.4vigeed3mx24ie4e@rob-hp-laptop> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3200 Lines: 90 On Wed, 2017-04-19 at 16:35 -0500, Rob Herring wrote: > On Thu, Apr 13, 2017 at 03:33:05PM +0800, Minghsiu Tsai wrote: > > If the mdp_* nodes are under an mdp sub-node, their corresponding > > platform device does not automatically get its iommu assigned properly. > > > > Fix this by moving the mdp component nodes up a level such that they are > > siblings of mdp and all other SoC subsystems. This also simplifies the > > device tree. > > It may simplify the DT, but it also breaks compatibility with old DT. > Not sure if that's a problem on Mediatek platforms, but please be > explicit here that you are breaking compatibility and why that is okay. > I will add the following description for more information. " Although it fixes iommu assignment issue, it also break compatibility with old device tree, so driver patch[1] is needed to iterate over sibling mdp device nodes, not child ones, to keep driver work properly. In mtk_mdp_probe() Old: for_each_child_of_node(dev->of_node, node) New: for_each_child_of_node(dev->of_node->parent, node) [1]https://patchwork.kernel.org/patch/9678833/ " > > > > Signed-off-by: Daniel Kurtz > > Signed-off-by: Minghsiu Tsai > > Should this have Daniel as the author? This patch is provided by Daniel, so I keep he is the author. I just split his patch into two parts. One is dts only, and the other is for driver. I also provide another patch to modify dts bindings according to this patch. > > > > > --- > > Documentation/devicetree/bindings/media/mediatek-mdp.txt | 12 +++--------- > > 1 file changed, 3 insertions(+), 9 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/media/mediatek-mdp.txt b/Documentation/devicetree/bindings/media/mediatek-mdp.txt > > index 4182063..0d03e3a 100644 > > --- a/Documentation/devicetree/bindings/media/mediatek-mdp.txt > > +++ b/Documentation/devicetree/bindings/media/mediatek-mdp.txt > > @@ -2,7 +2,7 @@ > > > > Media Data Path is used for scaling and color space conversion. > > > > -Required properties (controller (parent) node): > > +Required properties (controller node): > > - compatible: "mediatek,mt8173-mdp" > > - mediatek,vpu: the node of video processor unit, see > > Documentation/devicetree/bindings/media/mediatek-vpu.txt for details. > > @@ -32,21 +32,16 @@ Required properties (DMA function blocks, child node): > > for details. > > > > Example: > > -mdp { > > - compatible = "mediatek,mt8173-mdp"; > > - #address-cells = <2>; > > - #size-cells = <2>; > > - ranges; > > - mediatek,vpu = <&vpu>; > > - > > mdp_rdma0: rdma@14001000 { > > compatible = "mediatek,mt8173-mdp-rdma"; > > + "mediatek,mt8173-mdp"; > > reg = <0 0x14001000 0 0x1000>; > > clocks = <&mmsys CLK_MM_MDP_RDMA0>, > > <&mmsys CLK_MM_MUTEX_32K>; > > power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>; > > iommus = <&iommu M4U_PORT_MDP_RDMA0>; > > mediatek,larb = <&larb0>; > > + mediatek,vpu = <&vpu>; > > }; > > > > mdp_rdma1: rdma@14002000 { > > @@ -106,4 +101,3 @@ mdp { > > iommus = <&iommu M4U_PORT_MDP_WROT1>; > > mediatek,larb = <&larb4>; > > }; > > -}; > > -- > > 1.9.1 > >