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[PATCH v3 2/2] drm/panel: simple: Add support for ddc-only panel

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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.
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",
+		.data = &simple_ddc_only,
+	}, {
 		/* sentinel */
 	}
 };
-- 
2.11.0

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[PATCH] ARM: dts: imx: add CX9020 Embedded PC device tree <linux-kernel-dev@beckhoff.com> - 2017-07-12 11:20 +0200
  Re: [PATCH] ARM: dts: imx: add CX9020 Embedded PC device tree Mark Rutland <mark.rutland@arm.com> - 2017-07-12 11:50 +0200
    RE: [PATCH] ARM: dts: imx: add CX9020 Embedded PC device tree Patrick Brünn <P.Bruenn@beckhoff.com> - 2017-07-12 14:00 +0200
  Re: [PATCH] ARM: dts: imx: add CX9020 Embedded PC device tree Andrew Lunn <andrew@lunn.ch> - 2017-07-12 16:50 +0200
    RE: [PATCH] ARM: dts: imx: add CX9020 Embedded PC device tree Patrick Brünn <P.Bruenn@beckhoff.com> - 2017-07-13 05:20 +0200
  [PATCH v2 0/2] Add CX9020 device tree <linux-kernel-dev@beckhoff.com> - 2017-07-13 13:10 +0200
    [PATCH v2 2/2] drm/panel: simple: Add support for ddc-only panel <linux-kernel-dev@beckhoff.com> - 2017-07-13 13:10 +0200
      Re: [PATCH v2 2/2] drm/panel: simple: Add support for ddc-only panel Rob Herring <robh@kernel.org> - 2017-07-14 16:20 +0200
    [PATCH v2 1/2] ARM: dts: imx: add CX9020 Embedded PC device tree <linux-kernel-dev@beckhoff.com> - 2017-07-13 13:20 +0200
  [PATCH v3 1/2] ARM: dts: imx: add CX9020 Embedded PC device tree <linux-kernel-dev@beckhoff.com> - 2017-07-13 13:20 +0200
    Re: [PATCH v3 1/2] ARM: dts: imx: add CX9020 Embedded PC device tree Shawn Guo <shawnguo@kernel.org> - 2017-07-14 04:20 +0200
  [PATCH v3 0/2] Add CX9020 device tree <linux-kernel-dev@beckhoff.com> - 2017-07-13 13:20 +0200
    [PATCH v3 2/2] drm/panel: simple: Add support for ddc-only panel <linux-kernel-dev@beckhoff.com> - 2017-07-13 13:20 +0200

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