Linux/AM5728: HDMI_HPD pin definition

zheng yayu

Part Number: AM5728
Other Parts Discussed in Thread: TPD12S015

Tool/software: Linux

Hi, In AM5728 GP EVM, the pin B21 is used as HDMI_HPD. But In our custom board, the G20 is used as HDMI_HPD. I could not find the right dts or dtsi file for modifying pin mux. I use ti-processor-sdk-linux-am57xx-evm-03.03.00.04.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Kemal R. Shakir over 8 years ago in reply to Biser Gatchev-XID

TI__Guru 55345 points

Hello zheng,

Please, check the am57xx-evm-reva3.dts which includes am57xx-beagle-x15-revb1.dts and am57xx-beagle-x15-revb1.dts contains &tpd12s015 node where the <&gpio7 12 GPIO_ACTIVE_HIGH>; /* gpio7_12/sp1_cs2, HPD */ is initialised.

Best regards,
Kemal

0 zheng yayu over 8 years ago in reply to Kemal R. Shakir

Prodigy 60 points

Thank you very much for your quick answer.

The pin G20 has mux function as DCAN1_TX_UART8_RXD_MMC2_SDCD_HDMI1_HPD_GPIO1_14. Do I just need change <&gpio7 12 GPIO_ACTIVE_HIGH> to <&gpio1 14 GPIO_ACTIVE_HIGH> in tpd12s015 node.

I think we also need set pinmux for pin G20 because it has several functions such as dcan, uart, mmc, hpd and gpio, which is the same to pin B21(SPI1_CS2_UART4_RXD_MMC3_SDCD_SPI2_CS2_DCAN2_TX_MDIO_MCLK_HDMI1_HPD_GPIO7_12).

I could not find anywhere to set pinmux for pin B21.

0 zheng yayu over 8 years ago in reply to zheng yayu

Prodigy 60 points

Hi, Kemal. Has any update?

0 Kemal R. Shakir over 8 years ago in reply to zheng yayu

TI__Guru 55345 points

It is pinmuxed at U-Boot in <Processor SDK>/board-support/u-boot-<version>/arch/arm/dts/am57xx-beagle-x15.dts. Please, also check the tpd12s015: encoder node in <Processor SDK>/board-support/linux-<version>/arch/arm/boot/dts/am57xx-beagle-x15-common.dtsi where the <&gpio7 12 GPIO_ACTIVE_HIGH>; /* gpio7_12/sp1_cs2, HPD */ is used again.

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Linux/AM5728: HDMI_HPD pin definition