drm/imx: parallel-display: fix drm_panel support

[Gary Bisson]

Hi Philipp

On Tue, May 19, 2015 at 04:28:12PM +0200, Philipp Zabel wrote:
> The parallel-display driver used an undocumented, non-standard property
> "fsl,panel" to optionally associate with a drm_panel device. This patch
> fixes the driver to use the same OF graph bindings as the LDB driver
> instead:
> 
>     parallel-display {
>             compatible = "fsl,imx-parallel-display";
>             ...
> 
>             port at 1 {
>                     reg = <1>;
> 
>                     parallel_out: endpoint {
>                             remote_endpoint = <&panel_in>;
>                     };
>             };
>     };
> 
>     panel {
>             ...
> 
>             port {
>                     panel_in: endpoint {
>                             remote-endpoint = <&parallel_out>;
>                     };
>             };
>     };
> 
> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
> 
> ---

Tested on Nitrogen6x and Sabrelite using a Okaya RS800480T-7X0GP
display. Below are the different patches submitted that make use of this
change:
https://patchwork.kernel.org/patch/6585541/
https://patchwork.kernel.org/patch/6585551/
https://patchwork.kernel.org/patch/6504711/
https://patchwork.kernel.org/patch/6504731/

Tested-by: Gary Bisson <gary.bisson at boundarydevices.com>

Regards,
Gary