Messages in this thread | | | From | Rob Herring <> | Date | Fri, 14 Jul 2017 09:15:47 -0500 | Subject | Re: [PATCH v2 2/2] drm/panel: simple: Add support for ddc-only panel |
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On Thu, Jul 13, 2017 at 6:04 AM, <linux-kernel-dev@beckhoff.com> wrote: > From: Patrick Bruenn <p.bruenn@beckhoff.com> > > 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@beckhoff.com> > --- > 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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