topic Re: IMX7 Dual EVK - GPIO ID for PUSH button and LED in i.MX Processors

IMX7 Dual EVK - GPIO ID for PUSH button and LED

jordan_chen — Fri, 21 Sep 2018 07:49:53 GMT

Hi,
I am trying to modify DTS and verify PUSH button and LED features on IMX7 Dual EVK board (MCIMX7SABRE), but I have no idea which GPIO ID pins are used for EVK. Does anyone know the GPIO tables for IMX7 Dual EVK? Thanks.

PS. What I know is a green LED is always ON after device power on, a red LED is on if I long press ON/OFF button, then short press it again and there are 4 buttons (RST, ON/OFF, FUNC1, FUNC2). It seems like FUNC1 and FUNC2 buttons are not used.

Regards,
Jordan

Re: IMX7 Dual EVK - GPIO ID for PUSH button and LED

igorpadykov — Sat, 22 Sep 2018 00:39:13 GMT

Hi jordan

one can look at i.MX7D EVK schematic

Schematics (2)
Design files for i.MX 7Dual
Design files, including hardware schematics, Gerbers, and OrCAD files for i.MX 7Dual (REV D)
i.MX 7Dual Applications Processors | Dual Arm® Cortex®-A7 + Cortex-M4 |NXP

gpio mapping description on

Definitive GPIO guide - Studio Kousagi Wiki

Best regards
igor
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Re: IMX7 Dual EVK - GPIO ID for PUSH button and LED

jordan_chen — Sat, 22 Sep 2018 10:03:49 GMT

Hi igor,

Thanks a lot for the info.

Regards,

Jordan

Re: IMX7 Dual EVK - GPIO ID for PUSH button and LED

jordan_chen — Wed, 26 Sep 2018 11:23:33 GMT

Hi igor,

After setting gpio-key as following link, evtest can receive key event. Thanks.

I have further questions, do you know why these two registers (GPIO5_IO11 and GPIO5_IO10) must be configured to 0x59?

If I don't config them (that means I don't specify "pinctrl-0 = <&pinctrl_gpio_keys>;") or config them to 0x80000000 which means use default config, key event can not be triggered?

[Reference]

https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/imx7d-sdb.dts

	pinctrl_gpio_keys: gpio_keysgrp {
	fsl,pins = <
	MX7D_PAD_SD2_RESET_B__GPIO5_IO11 0x59
	MX7D_PAD_SD2_WP__GPIO5_IO10 0x59
	>;
	};

Regards,

Jordan

Re: IMX7 Dual EVK - GPIO ID for PUSH button and LED

igorpadykov — Thu, 27 Sep 2018 05:13:28 GMT

Hi Jordan

these settings configure pad registers, like IOMUXC_SW_PAD_CTL_PAD_SD2_RESET_B

so if configured properly in uboot, they also should work with default configs.

Best regards
igor