Linux/AM5728: HDMI clock polarity

shigehiro tsuda

Part Number: AM5728

Tool/software: Linux

Hi,

The AM572x EVM uses hdmi1_clockx as negative polarity and hdmi1_clocky as positive polarity.
Is it possible to use the reverse polarity?

The datasheet for AM5728 has the following description.
Table 4-6. HDMI Signal Descriptions
hdmi1_clockx HDMI clock differential positive or negative
hdmi1_clocky HDMI clock differential positive or negative

If possible, please tell me how to do this with the linux driver.

Best Regards,
Shigehiro Tsuda

over 6 years ago

0 Margarita Gashova over 6 years ago

TI__Guru* 80190 points

Hello,

Please refer the blow document
PSDK/board-support/linux-4.14.xx/Documentation/devicetree/bindings/display/ti/ti,omap5-dss.txt , search for lines.

Hope this is what you are looking for.

Best Regards,
Margarita

0 shigehiro tsuda over 6 years ago in reply to Margarita Gashova

Mastermind 9490 points

Hi Margarita,

Thank you for quick reply.

Check your answer document,
Add the following to dts and check with our customers.

&hdmi {
status = "ok";
vdda-supply = <&ldo4_reg>;

port {
lanes = <1 0 2 3 4 5 6 7>//add

Best Regards,
Shigehiro Tsuda

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Linux/AM5728: HDMI clock polarity