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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Simon Horman <horms@verge.net.au>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH 00/10] R-Car DU: Convert LVDS code to bridge driver
Date: Mon, 15 Jan 2018 09:00:59 +0200	[thread overview]
Message-ID: <1910701.B4GqNP9ovV@avalon> (raw)
In-Reply-To: <20180115065747.hx5kvhurk3x5f3jz@verge.net.au>

Hi Simon,

On Monday, 15 January 2018 08:57:48 EET Simon Horman wrote:
> On Fri, Jan 12, 2018 at 03:48:25PM +0200, Laurent Pinchart wrote:
> > On Friday, 12 January 2018 11:47:03 EET Geert Uytterhoeven wrote:
> >> On Fri, Jan 12, 2018 at 1:58 AM, Laurent Pinchart wrote:
> >>> This patch series addresses a design mistake that dates back from the
> >>> initial DU support. Support for the LVDS encoders, which are IP cores
> >>> separate from the DU, was bundled in the DU driver. Worse, both the DU
> >>> and LVDS were described through a single DT node.
> >>> 
> >>> To fix the, patches 01/10 and 02/10 define new DT bindings for the
> >>> LVDS encoders, and deprecate their description inside the DU bindings.
> >>> To retain backward compatibility with existing DT, patch 03/10 then
> >>> patches the device tree at runtime to convert the legacy bindings to the
> >>> new ones.
> >> 
> >> Looks like we will have to postpone the R-Car Gen2 Modern DT flag day
> >> again by a few kernel releases?
> > 
> > Why so ? We don't have to drop support for all legacy DT bindings at the
> > same time, do we ? We can switch to the new-style clock bindings on Gen2
> > already, and drop the legacy LVDS bindings later.
> 
> To clarify, after this patchset.
> * Old DTs work with old and new kernels.
> * New DTs require new kernels.

That's correct. I've tested old DTs with new kernels successfully on Lager, 
Salvator-X (both H3 ES1.x and M3-W) and Salvator-XS.

-- 
Regards,

Laurent Pinchart

  reply	other threads:[~2018-01-15  7:00 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-12  0:58 [PATCH 00/10] R-Car DU: Convert LVDS code to bridge driver Laurent Pinchart
2018-01-12  0:58 ` [PATCH 01/10] dt-bindings: display: renesas: Add R-Car LVDS encoder DT bindings Laurent Pinchart
2018-01-12  0:58   ` Laurent Pinchart
2018-01-12  9:45   ` Geert Uytterhoeven
     [not found]     ` <CAMuHMdWMgst-1evod+0hZujU2xPtO3UmO9c2CPPrTg=gpHpTbw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-12 13:36       ` Laurent Pinchart
2018-01-12 13:36         ` Laurent Pinchart
2018-01-12 10:13   ` Geert Uytterhoeven
2018-01-12 13:29     ` Laurent Pinchart
2018-01-15  6:55       ` Simon Horman
2018-01-15  6:55         ` Simon Horman
     [not found]         ` <20180115065528.cfelrll6dm6ggf4e-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>
2018-01-15  6:59           ` Laurent Pinchart
2018-01-15  6:59             ` Laurent Pinchart
2018-01-15  7:57             ` Simon Horman
2018-01-15  8:05             ` Geert Uytterhoeven
2018-01-15  8:26               ` Laurent Pinchart
     [not found]   ` <20180112005858.26472-2-laurent.pinchart+renesas-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
2018-01-12 12:59     ` Biju Das
2018-01-12 12:59       ` Biju Das
2018-01-12 13:26       ` Laurent Pinchart
2018-01-12 14:00         ` Fabrizio Castro
2018-01-12 14:25           ` Laurent Pinchart
2018-01-12 14:25             ` Laurent Pinchart
2018-01-12 15:13   ` Sergei Shtylyov
     [not found]     ` <81a9462b-6aaa-52c7-f741-e504c14838e9-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2018-01-12 20:34       ` Laurent Pinchart
2018-01-12 20:34         ` Laurent Pinchart
2018-01-12  0:58 ` [PATCH 02/10] dt-bindings: display: renesas: Deprecate LVDS support in the DU bindings Laurent Pinchart
2018-01-12  9:49   ` Geert Uytterhoeven
     [not found]     ` <CAMuHMdXYJmh8ssSRt8u75fTv5gyrpcoPKAuCT=BaF1Eu27CaiQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-12 10:44       ` Laurent Pinchart
2018-01-12 10:44         ` Laurent Pinchart
2018-01-19 21:23         ` Rob Herring
2018-01-19 21:23           ` Rob Herring
     [not found]   ` <20180112005858.26472-3-laurent.pinchart+renesas-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
2018-01-12  9:54     ` Vladimir Zapolskiy
2018-01-12  9:54       ` Vladimir Zapolskiy
2018-01-12 10:43       ` Laurent Pinchart
2018-01-12 14:52         ` Sergei Shtylyov
2018-01-12 14:52           ` Sergei Shtylyov
2018-01-12 15:14   ` Sergei Shtylyov
2018-01-12 15:14     ` Sergei Shtylyov
2018-01-12 16:46     ` Laurent Pinchart
2018-01-19 21:24   ` Rob Herring
2018-01-12  0:58 ` [PATCH 03/10] drm: rcar-du: Fix legacy DT to create LVDS encoder nodes Laurent Pinchart
     [not found]   ` <20180112005858.26472-4-laurent.pinchart+renesas-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
2018-01-12 10:09     ` Geert Uytterhoeven
2018-01-12 10:09       ` Geert Uytterhoeven
     [not found]       ` <CAMuHMdW5wDj5gyTnh+Xa3J10b_6For0MdhcTFgdU_+sgx=BYmA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-12 13:53         ` Laurent Pinchart
2018-01-12 13:53           ` Laurent Pinchart
2018-01-12  0:58 ` [PATCH 04/10] drm: rcar-du: Convert LVDS encoder code to bridge driver Laurent Pinchart
2018-01-12  0:58 ` [PATCH 05/10] ARM: dts: porter: Fix HDMI output routing Laurent Pinchart
2018-01-15  7:56   ` Simon Horman
2018-01-15  8:25     ` Laurent Pinchart
2018-01-16  9:09       ` Simon Horman
2018-01-12  0:58 ` [PATCH 06/10] ARM: dts: r8a7790: Convert to new LVDS DT bindings Laurent Pinchart
2018-01-12  0:58   ` Laurent Pinchart
2018-01-12  0:58 ` [PATCH 07/10] ARM: dts: r8a7791: " Laurent Pinchart
2018-01-12  0:58 ` [PATCH 08/10] ARM: dts: r8a7793: " Laurent Pinchart
2018-01-12  0:58 ` [PATCH 09/10] arm64: dts: renesas: r8a7795: " Laurent Pinchart
2018-01-12  0:58 ` [PATCH 10/10] arm64: dts: renesas: r8a7796: " Laurent Pinchart
2018-01-12  9:47 ` [PATCH 00/10] R-Car DU: Convert LVDS code to bridge driver Geert Uytterhoeven
2018-01-12 13:48   ` Laurent Pinchart
2018-01-15  6:57     ` Simon Horman
2018-01-15  6:57       ` Simon Horman
2018-01-15  7:00       ` Laurent Pinchart [this message]
2018-01-15  7:58         ` Simon Horman
     [not found] ` <20180112005858.26472-1-laurent.pinchart+renesas-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
2018-01-15  6:59   ` Simon Horman
2018-01-15  6:59     ` Simon Horman

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