Re: [PATCH 00/10] R-Car DU: Convert LVDS code to bridge driver

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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

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