Messages in this thread | | | Date | Mon, 6 Oct 2014 15:11:11 +0200 | From | Boris Brezillon <> | Subject | Re: [PATCH v7 10/11] ARM: at91/dt: add LCD panel description to sama5d3xdm.dtsi |
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On Mon, 6 Oct 2014 14:40:15 +0200 Thierry Reding <thierry.reding@gmail.com> wrote:
> On Mon, Oct 06, 2014 at 02:25:38PM +0200, Boris Brezillon wrote: > > On Mon, 6 Oct 2014 13:01:16 +0200 Thierry Reding <thierry.reding@gmail.com> wrote: > > > On Wed, Oct 01, 2014 at 04:53:07PM +0200, Boris Brezillon wrote: > > > [...] > > > > diff --git a/arch/arm/boot/dts/sama5d3xdm.dtsi b/arch/arm/boot/dts/sama5d3xdm.dtsi > [...] > > > > + backlight = <&backlight>; > > > > + power-supply = <&panel_reg>; > > > > + #address-cells = <1>; > > > > + #size-cells = <0>; > > > > + status = "disabled"; > > > > + > > > > + port@0 { > > > > + #address-cells = <1>; > > > > + #size-cells = <0>; > > > > + > > > > + panel_input: endpoint@0 { > > > > + reg = <0>; > > > > + remote-endpoint = <&hlcdc_panel_output>; > > > > + }; > > > > }; > > > > > > There's no support for OF graphs in simple-panel, so this is unused, > > > isn't it? > > > > Actually I use it in my atmel_hlcdc_ouput implementation to figure out > > the link between a panel and a device connected on the RGB/DPI bus. > > That's kind of weird and one of the reasons why I can't make myself like > the OF graph bindings. It requires drivers for one device to reach into > the device tree node of some other device and look for content. Or put > another way, a DT node for a panel that works on one platform doesn't > work on another because the display controller needs additional DT > content that isn't required by the original binding for the panel.
I also have a working POC of a DPI bus implementation (with DPI support in panel-simple driver).
This is a solution I developed to provide a generic DPI implementation in my HLCDC driver and rely on generic external implementations for slave devices (panels, encoders, ...).
But, IIRC, Laurent was not in favor of a bus approach because the DPI bus is just a data bus and not a control bus.
Anyway, I'll clean it up and post an RFC.
-- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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