Hi all,
I'm trying to set a pin high using my IMX7ULPEVK board. Using Kernel V5.15.7 (imx-image-multimedia-imx7ulpevk.wic)
I'm trying to get PTF11 high. (Arduino header D9).
In my interpretation, PTF is the 3th GPIOPort from the sources.
aliases {
gpio0 = &gpio_ptc;
gpio1 = &gpio_ptd;
gpio2 = &gpio_pte;
gpio3 = &gpio_ptf;
}
So for PTF11 i need to have have to calculate.
(port x 32) + pin =
(3 x 32) + 11 = 107
Running the following command to check if i can export the GPIO using sysfs.
echo 107 > /sys/class/gpio/export
Results in:
root@imx7ulpevk:~# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-31, parent: platform/40ae0000.gpio, 40ae0000.gpio:
gpio-0 ( |regulators:regulator) out lo
gpio-10 ( |cd ) in lo IRQ ACTIVE LOW
gpio-19 ( |? ) out hi
gpiochip1: GPIOs 32-63, parent: platform/40af0000.gpio, 40af0000.gpio:
gpio-32 ( |regulators:regulator) out hi
gpiochip2: GPIOs 64-95, parent: platform/40b00000.gpio, 40b00000.gpio:
gpiochip3: GPIOs 96-127, parent: platform/40b10000.gpio, 40b10000.gpio:
gpio-96 ( |fts_irq_gpio ) in hi IRQ
gpio-97 ( |fts_reset_gpio ) out hi
gpio-107 ( |sysfs ) in lo
gpiochip4: GPIOs 128-159, parent: platform/rpmsg-gpio0, imx-rpmsg-gpio-0:
gpio-142 ( |reset ) out hi ACTIVE LOW
gpio-143 ( |? ) out hi
gpiochip5: GPIOs 160-191, parent: platform/rpmsg-gpio1, imx-rpmsg-gpio-1:
So far so good, sysfs claimed the GPIO-107 on the correct bus, assuming my calculation is right.
When i try to get the pin to output the trouble begins...
root@imx7ulpevk:~# echo out > /sys/class/gpio/gpio107/direction
-sh: echo: write error: Invalid argumen
I'm unable to write out or "out" to the direction, so i'm unable to change this pin to output.
What could be wrong here? It does not seems that something is using the pin, my lsmod output is the following:
root@imx7ulpevk:~# lsmod
Module Size Used by
caam_jr 159744 0
caamkeyblob_desc 16384 1 caam_jr
caamhash_desc 16384 1 caam_jr
caamalg_desc 53248 1 caam_jr
crypto_engine 20480 1 caam_jr
authenc 16384 1 caam_jr
libdes 28672 1 caam_jr
rpmsg_iio_pedometer 16384 0
ath10k_sdio 32768 0
ath10k_core 372736 1 ath10k_sdio
ath 32768 1 ath10k_core
caam 20480 1 caam_jr
error 20480 5 caamkeyblob_desc,caamalg_desc,caamhash_desc,caam_jr,caam
Thanks in advance.
