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authorJyri Sarha <jsarha@ti.com>2015-02-10 14:13:23 +0200
committerJyri Sarha <jsarha@ti.com>2015-05-27 13:13:32 +0300
commit103cd8bc1c80ec0a12ef438c4493f7c26edc71bd (patch)
treea920df6557783343097c39d5f29680e6c637fda6 /Documentation
parent6730201f4fdcfbb1e6ec5ec374e6ef95e5bf9662 (diff)
downloadkernel-103cd8bc1c80ec0a12ef438c4493f7c26edc71bd.tar.gz
drm/tilcdc: Add support for external tda998x encoder
Add support for an external compontised DRM encoder. The external encoder can be connected to tilcdc trough device tree graph binding. The binding document for tilcdc has been updated. The current implementation supports only tda998x encoder. To be able to filter out the unsupported video modes the tilcdc driver needs to hijack the external connectors helper functions. The tilcdc installes new helper functions that are otherwise identical to orignals, but the mode_valid() call-back check the mode first localy, before calling the original call-back. The tilcdc dirver restores the original helper functions before it is unbound from the external device. I got the idea and some lines of code from Jean-Francois Moine's "drm/tilcdc: Change the interface with the tda998x driver"-patch. Signed-off-by: Jyri Sarha <jsarha@ti.com> Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt27
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt b/Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt
index fff10da5e927..2136ee81e061 100644
--- a/Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt
+++ b/Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt
@@ -18,6 +18,12 @@ Optional properties:
- max-pixelclock: The maximum pixel clock that can be supported
by the lcd controller in KHz.
+Optional nodes:
+
+ - port/ports: to describe a connection to an external encoder. The
+ binding follows Documentation/devicetree/bindings/graph.txt and
+ suppors a single port with a single endpoint.
+
Example:
fb: fb@4830e000 {
@@ -26,4 +32,25 @@ Example:
interrupt-parent = <&intc>;
interrupts = <36>;
ti,hwmods = "lcdc";
+
+ port {
+ lcdc_0: endpoint@0 {
+ remote-endpoint = <&hdmi_0>;
+ };
+ };
+ };
+
+ tda19988: tda19988 {
+ compatible = "nxp,tda998x";
+ reg = <0x70>;
+
+ pinctrl-names = "default", "off";
+ pinctrl-0 = <&nxp_hdmi_bonelt_pins>;
+ pinctrl-1 = <&nxp_hdmi_bonelt_off_pins>;
+
+ port {
+ hdmi_0: endpoint@0 {
+ remote-endpoint = <&lcdc_0>;
+ };
+ };
};