IMX6ULL Unable to toggle GPIO

Almaz — Sat, 16 Jan 2021 13:07:12 GMT

Hi. Have issue with simple GPIO toggling.

Here what I have at power up:

# cat /sys/kernel/debug/gpio gpiochip0: GPIOs 0-31, parent: platform/209c000.gpio, 209c000.gpio: gpio-19 ( |cd ) in hi gpio-20 ( |spi_imx ) out hi gpiochip1: GPIOs 32-63, parent: platform/20a0000.gpio, 20a0000.gpio: gpiochip2: GPIOs 64-95, parent: platform/20a4000.gpio, 20a4000.gpio: gpio-77 ( |wakeup ) out lo gpio-83 ( |reset ) out hi gpiochip3: GPIOs 96-127, parent: platform/20a8000.gpio, 20a8000.gpio: gpiochip4: GPIOs 128-159, parent: platform/20ac000.gpio, 20ac000.gpio:

Then I configure GPIO4.IO[16]:

echo "112" > /sys/class/gpio/export echo "out" > /sys/class/gpio/gpio112/direction echo "1" > /sys/class/gpio/gpio112/value

And see that it configured:

gpiochip3: GPIOs 96-127, parent: platform/20a8000.gpio, 20a8000.gpio: gpio-112 ( |sysfs ) out hi

when I toggle it from `1` to `0`:

echo "0" > /sys/class/gpio/gpio112/value

I see that it changes in `/debug/gpio`:

gpiochip3: GPIOs 96-127, parent: platform/20a8000.gpio, 20a8000.gpio: gpio-112 ( |sysfs ) out lo

Oscilloscope shoes that it is toggles really.

But when I try to do same with `GPIO4.IO[11]`:

echo "107" > /sys/class/gpio/export echo "out" > /sys/class/gpio/gpio107/direction echo "1" > /sys/class/gpio/gpio107/value

I see that it initialized:

gpiochip3: GPIOs 96-127, parent: platform/20a8000.gpio, 20a8000.gpio: gpio-107 ( |sysfs ) out hi gpio-112 ( |sysfs ) out lo

and toggles:

echo "0" > /sys/class/gpio/gpio107/value

in SW:

gpiochip3: GPIOs 96-127, parent: platform/20a8000.gpio, 20a8000.gpio: gpio-107 ( |sysfs ) out lo gpio-112 ( |sysfs ) out lo

But not in reality. Oscilloscope shows that it is remains constantly HIGH and not reacts anything on togling using `/sys/class/gpio/gpio107`

Same trouble with GPIO 109, 111, 108, 101 and 106 while 78, 112 and 110 toggles as expected.

Here is my DTS.

Here what I see in debug info:

root@OpenWrt:/# cat /sys/kernel/debug/pinctrl/pinctrl-maps Pinctrl maps: device 20e0000.iomuxc state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group hoggrp-1 function imx6ul-evk device 20e0000.iomuxc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART1_RTS_B config 00017059 device 208c000.pwm state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group pwm4grp function imx6ul-evk device 208c000.pwm state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_GPIO1_IO05 config 000110b0 device 2020000.serial state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group uart1grp function imx6ul-evk device 2020000.serial state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART1_TX_DATA config 0001b0b1 device 2020000.serial state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART1_RX_DATA config 0001b0b1 device 2010000.ecspi state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group ecspi3grp-0 function imx6ul-evk device 2010000.ecspi state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART2_CTS_B config 000110b1 device 2010000.ecspi state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART2_RTS_B config 000110b1 device 2010000.ecspi state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART2_RX_DATA config 000110b1 device 2010000.ecspi state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART2_TX_DATA config 000010b0 device 2188000.ethernet state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group enet1grp function imx6ul-evk device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_EN config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_ER config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_DATA0 config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_DATA1 config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_EN config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_DATA0 config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_DATA1 config 0001b0b0 device 2188000.ethernet state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_CLK config 0001b031 device 20bc000.wdog state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group wdoggrp function imx6ul-evk device 20bc000.wdog state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_RESET config 000030b0 device 2200000.aips-bus:wfx_pwrseq state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group wfx_reset_grp function imx6ul-evk device 2200000.aips-bus:wfx_pwrseq state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA14 config 0001b0b0 device 2190000.usdhc state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group usdhc1grp function imx6ul-evk device 2190000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_SD1_CMD config 00017059 device 2190000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_SD1_CLK config 00010071 device 2190000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA0 config 00017059 device 2190000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA1 config 00017059 device 2190000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA2 config 00017059 device 2190000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA3 config 00017059 device 2194000.usdhc state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group usdhc2grp function imx6ul-evk device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA18 config 0001b0b0 device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA19 config 000100b0 device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA20 config 0001b0b0 device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA21 config 0001b0b0 device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA22 config 0001b0b0 device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA23 config 0001b0b0 device 2194000.usdhc state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA06 config 0001b0b0 device 202c000.sai state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group sai2grp function imx6ul-evk device 202c000.sai state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_JTAG_TDI config 00017088 device 202c000.sai state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_JTAG_TDO config 00017088 device 202c000.sai state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_JTAG_TRST_B config 00011088 device 202c000.sai state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_JTAG_TCK config 00011088 device 202c000.sai state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_JTAG_TMS config 00017088 device 2090000.flexcan state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group flexcan0grp function imx6ul-evk device 2090000.flexcan state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART3_RTS_B config 0001b020 device 2090000.flexcan state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_UART3_CTS_B config 0001b020 device 2094000.flexcan state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group flexcan1grp function imx6ul-evk device 2094000.flexcan state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA11 config 0001b020 device 2094000.flexcan state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA10 config 0001b020 device mmc1:0001:1 state default type MUX_GROUP (2) controlling device 20e0000.iomuxc group wfx_wakeup_grp function imx6ul-evk device mmc1:0001:1 state default type CONFIGS_PIN (3) controlling device 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA08 config 000130b0

root@OpenWrt:/# cat /sys/kernel/debug/pinctrl/pinctrl-handles Requested pin control handlers their pinmux maps: device: 20e0000.iomuxc current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: hoggrp-1 (0) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART1_RTS_B (36)config 00017059 device: 208c000.pwm current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: pwm4grp (8) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_GPIO1_IO05 (28)config 000110b0 device: 2020000.serial current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: uart1grp (10) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART1_TX_DATA (33)config 0001b0b1 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART1_RX_DATA (34)config 0001b0b1 device: 2010000.ecspi current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: ecspi3grp-0 (2) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART2_CTS_B (39)config 000110b1 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART2_RTS_B (40)config 000110b1 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART2_RX_DATA (38)config 000110b1 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART2_TX_DATA (37)config 000010b0 device: 2188000.ethernet current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: enet1grp (5) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_EN (51)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_ER (56)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_DATA0 (49)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_RX_DATA1 (50)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_EN (54)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_DATA0 (52)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_DATA1 (53)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_ENET1_TX_CLK (55)config 0001b031 device: 20bc000.wdog current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: wdoggrp (17) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_RESET (69)config 000030b0 device: 2200000.aips-bus:wfx_pwrseq current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: wfx_reset_grp (15) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA14 (84)config 0001b0b0 device: 2190000.usdhc current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: usdhc1grp (11) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_SD1_CMD (111)config 00017059 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_SD1_CLK (112)config 00010071 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA0 (113)config 00017059 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA1 (114)config 00017059 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA2 (115)config 00017059 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_SD1_DATA3 (116)config 00017059 device: 2194000.usdhc current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: usdhc2grp (14) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA18 (88)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA19 (89)config 000100b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA20 (90)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA21 (91)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA22 (92)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA23 (93)config 0001b0b0 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA06 (76)config 0001b0b0 device: 202c000.sai current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: sai2grp (9) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_JTAG_TDI (20)config 00017088 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_JTAG_TDO (19)config 00017088 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_JTAG_TRST_B (22)config 00011088 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_JTAG_TCK (21)config 00011088 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_JTAG_TMS (18)config 00017088 device: 2090000.flexcan current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: flexcan0grp (6) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART3_RTS_B (44)config 0001b020 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_UART3_CTS_B (43)config 0001b020 device: 2094000.flexcan current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: flexcan1grp (7) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA11 (81)config 0001b020 type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA10 (80)config 0001b020 device: mmc1:0001:1 current state: default state: default type: MUX_GROUP controller 20e0000.iomuxc group: wfx_wakeup_grp (16) function: imx6ul-evk (0) type: CONFIGS_PIN controller 20e0000.iomuxc pin MX6UL_PAD_LCD_DATA08 (78)config 000130b0

I am trying to toggle at custom hardware so is it some SW issue affects such behaviour or it is only HW issue? I tested my HW and I don't get any shortings between that GPIO pads (tested using multimeter).

Any idea what might be wrong? Thank you.

EDIT.

So after reading this: https://community.nxp.com/t5/i-MX-Processors/i-MX51-Device-Tree-GPIO-as-output/m-p/295981

Added following to dts's `pinctr_hog_1:

MX6UL_PAD_NAND_ALE__GPIO4_IO10 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_DATA03__GPIO4_IO05 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_READY_B__GPIO4_IO12 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_CLE__GPIO4_IO15 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_CE0_B__GPIO4_IO13 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_CE1_B__GPIO4_IO14 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_WP_B__GPIO4_IO11 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_DQS__GPIO4_IO16 0x000010B0 /* General GPIO */ MX6UL_PAD_LCD_DATA09__GPIO3_IO14 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_DATA00__GPIO4_IO02 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_RE_B__GPIO4_IO00 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_WE_B__GPIO4_IO01 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_DATA01__GPIO4_IO03 0x000010B0 /* General GPIO */ MX6UL_PAD_NAND_DATA02__GPIO4_IO04 0x000010B0 /* General GPIO */

After that gpio started to work as expected.

Now I need to do same for 4 more tamper gpios. So using Config Tools for i.MX Version 8.0 got following node for dts:

&iomuxc_snvs { pinctrl-names = "default_snvs"; pinctrl-0 = <&pinctrl_hog_2>; imx6ul-evk { pinctrl_hog_2: hoggrp-2 { fsl,pins = < MX6ULL_PAD_SNVS_TAMPER1__GPIO5_IO01 0x000110A0 MX6ULL_PAD_SNVS_TAMPER4__GPIO5_IO04 0x000110A0 MX6ULL_PAD_SNVS_TAMPER5__GPIO5_IO05 0x000110A0 MX6ULL_PAD_SNVS_TAMPER9__GPIO5_IO09 0x000110A0 >; }; }; };

But it throws me syntax error during dts compilation on MX6ULL_PAD_SNVS_TAMPER1__GPIO5_IO01 row.

If I replace gpio names from MX6ULL.. to MX6UL.. it compiles but stucks on kernel loading. How could I fix this?

i.MX ProcessorsのトピックIMX6ULL Unable to toggle GPIO

IMX6ULL Unable to toggle GPIO