>
> This may help make things clearer:

#show-pins | sort
P8.03 / eMMC d6                    6 fast rx  up  1 mmc 1 d6        
 mmc@481d8000 (pinmux_emmc_pins)
P8.04 / eMMC d7                    7 fast rx  up  1 mmc 1 d7        
 mmc@481d8000 (pinmux_emmc_pins)
P8.05 / eMMC d2                    2 fast rx  up  1 mmc 1 d2        
 mmc@481d8000 (pinmux_emmc_pins)
P8.06 / eMMC d3                    3 fast rx  up  1 mmc 1 d3        
 mmc@481d8000 (pinmux_emmc_pins)
P8.07                             36 fast         7 gpio 2.02 lo >>  leds 
(pinmux_led_pins)
P8.08                             37 fast         7 gpio 2.03 lo >>  leds 
(pinmux_led_pins)
P8.09                             39 fast rx  up  7 gpio 2.05 << hi  sysfs 
(pins)
P8.10                             38 fast rx  up  7 gpio 2.04 << hi  sysfs 
(pins)
P8.11                             13 fast rx  up  4 qep 2 in B      
 ocp/helper (pins)
P8.12                             12 fast rx  up  4 qep 2 in A      
 ocp/helper (pins)
P8.13                              9 fast    down 4 pwm 2 out B      
ocp/helper (pins)
P8.14                             10 fast         7 gpio 0.26 lo >>  leds 
(pinmux_led_pins)
P8.15                             15 fast rx  up  6 pru 0 in 15      
ocp/helper (pins)
P8.16                             14 fast rx  up  6 pru 0 in 14      
ocp/helper (pins)
P8.17                             11 fast         7 gpio 0.27 lo >>  leds 
(pinmux_led_pins)
P8.18                             35 fast         7 gpio 2.01        
ocp/helper (pins)
P8.19                              8 fast    down 4 pwm 2 out A      
ocp/helper (pins)
P8.20 / eMMC cmd                  33 fast rx  up  2 mmc 1 cmd        
mmc@481d8000 (pinmux_emmc_pins)
P8.21 / eMMC clk                  32 fast rx  up  2 mmc 1 clk        
mmc@481d8000 (pinmux_emmc_pins)
P8.22 / eMMC d5                    5 fast rx  up  1 mmc 1 d5        
 mmc@481d8000 (pinmux_emmc_pins)
P8.23 / eMMC d4                    4 fast rx  up  1 mmc 1 d4        
 mmc@481d8000 (pinmux_emmc_pins)
P8.24 / eMMC d1                    1 fast rx  up  1 mmc 1 d1        
 mmc@481d8000 (pinmux_emmc_pins)
P8.25 / eMMC d0                    0 fast rx  up  1 mmc 1 d0        
 mmc@481d8000 (pinmux_emmc_pins)
P8.26                             31 fast         7 gpio 1.29 lo >>  leds 
(pinmux_led_pins)
P8.27 / hdmi                      56 fast    down 5 pru 1 out 8      
ocp/helper (pins)
P8.28 / hdmi                      58 fast    down 5 pru 1 out 10    
 ocp/helper (pins)
P8.29 / hdmi                      57 fast    down 5 pru 1 out 9      
ocp/helper (pins)
P8.30 / hdmi                      59 fast    down 5 pru 1 out 11    
 ocp/helper (pins)
P8.31 / hdmi / sysboot 14         54 fast         7 gpio 0.10 lo >>  sysfs 
(pins)
P8.32 / hdmi / sysboot 15         55 fast         7 gpio 0.11 lo >>  leds 
(pinmux_led_pins)
P8.33 / hdmi / sysboot 13         53 fast rx  up  2 qep 1 in B      
 ocp/helper (pins)
P8.34 / hdmi / sysboot 11         51 fast rx      7 gpio 2.17       
P8.35 / hdmi / sysboot 12         52 fast rx  up  2 qep 1 in A      
 ocp/helper (pins)
P8.36 / hdmi / sysboot 10         50 fast         7 gpio 2.16 lo >>  sysfs 
(pins)
P8.37 / hdmi / sysboot 8          48 fast         4 uart 5 txd      
 ocp/helper (pins)
P8.38 / hdmi / sysboot 9          49 fast rx      4 uart 5 rxd      
 ocp/helper (pins)
P8.39 / hdmi / sysboot 6          46 fast    down 5 pru 1 out 6      
ocp/helper (pins)
P8.40 / hdmi / sysboot 7          47 fast    down 5 pru 1 out 7      
ocp/helper (pins)
P8.41 / hdmi / sysboot 4          44 fast    down 5 pru 1 out 4      
ocp/helper (pins)
P8.42 / hdmi / sysboot 5          45 fast    down 5 pru 1 out 5      
ocp/helper (pins)
P8.43 / hdmi / sysboot 2          42 fast         7 gpio 2.08 lo >>  sysfs 
(pins)
P8.44 / hdmi / sysboot 3          43 fast         7 gpio 2.09 lo >>  sysfs 
(pins)
P8.45 / hdmi / sysboot 0          40 fast         7 gpio 2.06 lo >>  sysfs 
(pins)
P8.46 / hdmi / sysboot 1          41 fast         7 gpio 2.07 lo >>  sysfs 
(pins)
P9.11                             28 fast rx  up  6 uart 4 rxd      
 ocp/P9_11_pinmux (pinmux_P9_11_uart_pin)
P9.12                             30 fast         7 gpio 1.28        
ocp/helper (pins)
P9.13                             29 fast         7 gpio 0.31 lo >>  sysfs 
(pins)
P9.14                             18 fast    down 6 pwm 1 out A      
ocp/helper (pins)
P9.15                             16 fast         7 gpio 1.16 lo >>  sysfs 
(pins)
P9.15                             34 fast         7 gpio 2.00 lo >>  sysfs 
(pins)
P9.16                             19 fast    down 6 pwm 1 out B      
ocp/helper (pins)
P9.17 / spi boot cs               87 fast rx  up  2 i²c 1 scl        
ocp/helper (pins)
P9.18 / spi boot out              86 fast rx  up  2 i²c 1 sda        
ocp/helper (pins)
P9.19 / cape i²c scl              95 slow rx  up  3 i²c 2 scl        
ocp/helper (pins)
P9.20 / cape i²c sda              94 slow rx  up  3 i²c 2 sda        
ocp/helper (pins)
P9.21 / spi boot in               85 fast rx  up  1 uart 2 txd      
 ocp/P9_21_pinmux (pinmux_P9_21_uart_pin)
P9.22 / spi boot clk              84 fast rx  up  1 uart 2 rxd      
 ocp/P9_22_pinmux (pinmux_P9_22_uart_pin)
P9.23                             17 fast rx  up  7 gpio 1.17        
ocp/P9_23_pinmux (pinmux_P9_23_gpio_pu_pin)
P9.24                             97 fast rx  up  0 uart 1 txd      
 ocp/P9_24_pinmux (pinmux_P9_24_uart_pin)
P9.25 / audio osc                107 fast rx  up  7 gpio 3.21 << lo  sysfs 
(pins)
P9.26                             96 fast rx  up  0 uart 1 rxd      
 ocp/P9_26_pinmux (pinmux_P9_26_uart_pin)
P9.27                            105 fast rx  up  1 qep 0 in B      
 ocp/helper (pins)
P9.28 / hdmi audio data          103 fast rx  up  7 gpio 3.17 << hi  sysfs 
(pinmux_P9_28_gpio_pu_pin)
P9.29 / hdmi audio fs            101 fast rx down 3 spi 1 d0 miso    
ocp/P9_29_pinmux (pinmux_P9_29_spi_pin)
P9.30                            102 fast rx down 3 spi 1 d1 mosi    
ocp/P9_30_pinmux (pinmux_P9_30_spi_pin)
P9.31 / hdmi audio clk           100 fast rx down 3 spi 1 clk        
ocp/P9_31_pinmux (pinmux_P9_31_spi_pin)
P9.41                            106 fast rx  up  7 gpio 3.20        
ocp/D13_pinmux (pinmux_D13_gpio_pu_pin)
P9.41 / jtag emu3                109 fast         7 gpio 0.20 lo >>  sysfs 
(pins)
P9.42                            104 fast rx  up  1 qep 0 in A      
 ocp/helper (pins)
P9.42                             89 fast         2 spi 1 cs 1      
 ocp/C18_pinmux (pinmux_C18_spi_pin) 

Instead of:

ocp/helper (pins) or sysfs (pins)

it's expecting something akin to:

 ocp/P8_45_pinmux (pinmux_P8_45_xxxxx)

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