On Thu, Jul 13, 2017 at 6:04 AM, <linux-kernel-dev@xxxxxxxxxxxx> wrote:
> From: Patrick Bruenn <p.bruenn@xxxxxxxxxxxx>
>
> This is a fix for the CX9020 Embedded PC. On that device the 24-bit
> parallel-display signal of the imx53 is combined with an I2C channel
> and converted to DVI-D port. Devicetree magic always requires a panel
> connected to the parallel-display port.
Then fix this. It's not the DT that requires this, but limitations in
the i.MX driver.
> We add an empty panel_desc, to get recognized by the panel-simple
> driver, which can then use the ddc bus to read the panels configuration.
>
> Signed-off-by: Patrick Bruenn <p.bruenn@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panel/panel-simple.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index c4566ce8fda7..52b2a7fb59ed 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1856,6 +1856,9 @@ static const struct panel_desc winstar_wf35ltiacd = {
> .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
> };
>
> +static const struct panel_desc simple_ddc_only = {
> +};
> +
> static const struct of_device_id platform_of_match[] = {
> {
> .compatible = "ampire,am-480272h3tmqw-t01h",
> @@ -2050,6 +2053,9 @@ static const struct of_device_id platform_of_match[] = {
> .compatible = "winstar,wf35ltiacd",
> .data = &winstar_wf35ltiacd,
> }, {
> + .compatible = "simple,ddc-only",
If you notice the rest of the file, we require compatibles be specific
for the panels.
What you want here is a "dvi-connector" node.
Rob
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