LEDs Pinmux Question

device
1

Hello,

A bit ago I was trying to get a touchscreen working with a CM3 module and ran into some problems. I wanted to try to take a crack at solving the problem and I had a few questions.

When I try to load the goodix.dtb touch driver I get the following error:

Oct 18 23:09:47 localhost kernel: pinctrl-bcm2835 3f200000.gpio: pin gpio9 already requested by leds; cannot claim for 3f204000.spi Oct 18 23:09:47 localhost kernel: pinctrl-bcm2835 3f200000.gpio: pin-9 (3f204000.spi) status -22 Oct 18 23:09:47 localhost kernel: pinctrl-bcm2835 3f200000.gpio: could not request pin 9 (gpio9) from group gpio9 on device pinctrl-bcm28 Oct 18 23:09:47 localhost kernel: spi-bcm2835 3f204000.spi: Error applying setting, reverse things back Oct 18 23:09:47 localhost kernel: spi-bcm2835: probe of 3f204000.spi failed with error -22 Oct 18 23:09:47 localhost kernel: pinctrl-bcm2835 3f200000.gpio: pin gpio0 already requested by leds; cannot claim for 3f205000.i2c Oct 18 23:09:47 localhost kernel: pinctrl-bcm2835 3f200000.gpio: pin-0 (3f205000.i2c) status -22 Oct 18 23:09:47 localhost kernel: pinctrl-bcm2835 3f200000.gpio: could not request pin 0 (gpio0) from group gpio0 on device pinctrl-bcm28 Oct 18 23:09:47 localhost kernel: i2c-bcm2835 3f205000.i2c: Error applying setting, reverse things back

It looks like the issue is that the driver needs a few pins that are already in use. How do I go about freeing these pins so that the touch driver can use them? Below you can see that half of the GPIO are bound to leds for some reason. I’m using the default ubuntu core CM3 image.

z4@localhost:~$ sudo cat /sys/kernel/debug/pinctrl/3f200000.gpio/pinmux-pins Pinmux settings per pin Format: pin (name): mux_owner gpio_owner hog? pin 0 (gpio0): leds (GPIO UNCLAIMED) function alt2 group gpio0 pin 1 (gpio1): leds (GPIO UNCLAIMED) function alt2 group gpio1 pin 2 (gpio2): leds (GPIO UNCLAIMED) function alt2 group gpio2 pin 3 (gpio3): leds (GPIO UNCLAIMED) function alt2 group gpio3 pin 4 (gpio4): leds (GPIO UNCLAIMED) function alt2 group gpio4 pin 5 (gpio5): leds (GPIO UNCLAIMED) function alt2 group gpio5 pin 6 (gpio6): leds (GPIO UNCLAIMED) function alt2 group gpio6 pin 7 (gpio7): leds (GPIO UNCLAIMED) function alt2 group gpio7 pin 8 (gpio8): leds (GPIO UNCLAIMED) function alt2 group gpio8 pin 9 (gpio9): leds (GPIO UNCLAIMED) function alt2 group gpio9 pin 10 (gpio10): leds (GPIO UNCLAIMED) function alt2 group gpio10 pin 11 (gpio11): leds (GPIO UNCLAIMED) function alt2 group gpio11 pin 12 (gpio12): leds (GPIO UNCLAIMED) function alt2 group gpio12 pin 13 (gpio13): leds (GPIO UNCLAIMED) function alt2 group gpio13 pin 14 (gpio14): leds (GPIO UNCLAIMED) function alt2 group gpio14 pin 15 (gpio15): leds (GPIO UNCLAIMED) function alt2 group gpio15 pin 16 (gpio16): leds (GPIO UNCLAIMED) function alt2 group gpio16 pin 17 (gpio17): leds (GPIO UNCLAIMED) function alt2 group gpio17 pin 18 (gpio18): leds (GPIO UNCLAIMED) function alt2 group gpio18 pin 19 (gpio19): leds (GPIO UNCLAIMED) function alt2 group gpio19 pin 20 (gpio20): leds (GPIO UNCLAIMED) function alt2 group gpio20 pin 21 (gpio21): leds (GPIO UNCLAIMED) function alt2 group gpio21 pin 22 (gpio22): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 23 (gpio23): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 24 (gpio24): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 25 (gpio25): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 26 (gpio26): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 27 (gpio27): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 28 (gpio28): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 29 (gpio29): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 30 (gpio30): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 31 (gpio31): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 32 (gpio32): 3f215040.serial (GPIO UNCLAIMED) function alt5 group gpio32 pin 33 (gpio33): 3f215040.serial (GPIO UNCLAIMED) function alt5 group gpio33 pin 34 (gpio34): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 35 (gpio35): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 36 (gpio36): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 37 (gpio37): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 38 (gpio38): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 39 (gpio39): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 40 (gpio40): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 41 (gpio41): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 42 (gpio42): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 43 (gpio43): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 44 (gpio44): 3f804000.i2c (GPIO UNCLAIMED) function alt2 group gpio44 pin 45 (gpio45): 3f804000.i2c (GPIO UNCLAIMED) function alt2 group gpio45 pin 46 (gpio46): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 47 (gpio47): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 48 (gpio48): 3f202000.mmc (GPIO UNCLAIMED) function alt0 group gpio48 pin 49 (gpio49): 3f202000.mmc (GPIO UNCLAIMED) function alt0 group gpio49 pin 50 (gpio50): 3f202000.mmc (GPIO UNCLAIMED) function alt0 group gpio50 pin 51 (gpio51): 3f202000.mmc (GPIO UNCLAIMED) function alt0 group gpio51 pin 52 (gpio52): 3f202000.mmc (GPIO UNCLAIMED) function alt0 group gpio52 pin 53 (gpio53): 3f202000.mmc (GPIO UNCLAIMED) function alt0 group gpio53

3

Okay so the problem was that I had DPI enabled for the screen, which uses the first 21 GPIO pins. As a result I needed to disable SPI and I2C0 because they use some of those GPIO pins. I still can’t seem to get the goodix touch driver to load – working on that now.

5

looks like you can move around the gpio’s in use by defining the right params as option to the goodix entry: