Difference between revisions of "Beagleboard:BeagleBone cape interface spec"

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(/dev/bone/eqep/2a)
(/dev/bone/eqep/2a)
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* P9.21 - STROBE (''N/A'' on AM3358)
 
* P9.21 - STROBE (''N/A'' on AM3358)
  
=== /dev/bone/eqep/2a ===
+
=== /dev/bone/eqep/2 ===
 
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep2b-00A0.dts <br>
 
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep2b-00A0.dts <br>
 
AM3358 eQEP2<br>
 
AM3358 eQEP2<br>
Line 287: Line 287:
 
* P8.16 - INDEX on AM3358 only
 
* P8.16 - INDEX on AM3358 only
 
* P9.15 - INDEX on AM5729 only
 
* P9.15 - INDEX on AM5729 only
 +
 +
=== /dev/bone/eqep/2a ===
 +
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep2-00A0.dts <br>
 +
AM3358 eQEP2<br>
 +
AM5729 ''N/A'
 +
* P8.41 - A
 +
* P8.42 - B
 +
* P8.40 - STROBE
 +
* P8.39 - INDEX
  
 
= McASP =
 
= McASP =

Revision as of 11:54, 9 April 2020

This is a list of symlink interfaces based on BeagleBone Cape header pins.[1][2]

I2C

/dev/bone/i2c/0

AM3358 I2C0
AM5729 I2C1

  • On-board peripherals

/dev/bone/i2c/1

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-I2C1-00A0.dts
AM3358 I2C1
AM5729 I2C5

  • P9.17 - SCL
  • P9.18 - SDA

/dev/bone/i2c/2

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-I2C2-00A0.dts
AM3358 I2C2
AM5729 I2C4

  • P9.19 - SCL
  • P9.20 - SDA

/dev/bone/i2c/3

AM3358 N/A
AM5729 I2C3

  • P9.24 - SCL
  • P9.26 - SDA


SPI

Need to add a symlink from /dev/spi to /dev/bone/spi.

/dev/bone/spi/0.x

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-SPIDEV0-00A0.dts
AM3358 SPI0
AM5729 SPI2

  • P9.18 - MOSI
  • P9.21 - MISO
  • P9.22 - CLK

/dev/bone/spi/0.0

AM3358 SPI0 CS0
AM5729 SPI2 CS0

  • P9.17 - CS

/dev/bone/spi/1.x

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-SPIDEV1-00A0.dts
AM3358 SPI1
AM5729 SPI3

  • P9.31 - CLK
  • P9.30 - MOSI
  • P9.29 - MISO

/dev/bone/spi/1.0

AM3358 SPI1 CS0
AM5729 SPI3 CS0

  • P9.28 - CS

/dev/bone/spi/1.1

AM3358 SPI1 CS1
AM5729 SPI3 CS1

  • P9.42 - CS

/dev/bone/spi/1.2

AM3358 SPI1 GPIO1_17
AM5729 SPI3 GPIO7_11

  • P9.23 - CS

UART

/dev/bone/uart/0

AM3358 UART0
AM5729 UART1

  • console debug header pins

/dev/bone/uart/1

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART1-00A0.dts
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART1-RTSCTS-00A0.dts
AM3358 UART1
AM5729 UART10

  • P9.24 - TX
  • P9.26 - RX
  • P9.19 - RTSn
  • P9.20 - CTSn
  • P8.4 - RTSn (N/A on AM3358)
  • P8.3 - CTSn (N/A on AM3358)

/dev/bone/uart/2

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART2-00A0.dts
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART2-RTSCTS-00A0.dts AM3358 UART2
AM5729 UART3

  • P9.21 - TX
  • P9.22 - RX
  • P8.38 - RTSn (N/A on AM5729)
  • P8.37 - CTSn (N/A on AM5729)

/dev/bone/uart/3

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART3-00A0.dts
AM3358 UART3
AM5729 N/A

  • P9.42 - TX

/dev/bone/uart/4

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART4-00A0.dts
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART4-RTSCTS-00A0.dts
AM3358 UART4
AM5729 UART5

  • P9.13 - TX
  • P9.11 - RX
  • P8.33 - RTSn (N/A on AM5729)
  • P8.35 - CTSn (N/A on AM5729)
  • P8.6 - RTSn (N/A on AM3358)
  • P8.5 - CTSn (N/A on AM3358)

/dev/bone/uart/5

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART5-00A0.dts
https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-UART5-RTSCTS-00A0.dts
AM3358 UART5
AM5729 UART8

  • P8.37 - TX
  • P8.38 - RX
  • P8.32 - RTSn
  • P8.31 - CTSn

CAN

/dev/bone/can/0

AM3358 CAN0
AM5729 N/A

  • P9.19 - RX
  • P9.20 - TX

/dev/bone/can/1

AM3358 CAN1
AM5729 CAN2

  • P9.24 - RX
  • P9.26 - TX

ADC

Work needs to be done to create these symlinks as well as handle major differences in the driver used for the ADC. Maybe just have the "okay" in here and more in the base tree?

/dev/bone/adc/n

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-ADC-00A0.dts

  • 0 - AM3358 in_voltage0_raw, AM5729 in_voltage0_raw
  • 1 - AM3358 in_voltage1_raw, AM5729 in_voltage1_raw
  • 2 - AM3358 in_voltage2_raw, AM5729 in_voltage3_raw
  • 3 - AM3358 in_voltage3_raw, AM5729 in_voltage2_raw
  • 4 - AM3358 in_voltage4_raw, AM5729 in_voltage7_raw
  • 5 - AM3358 in_voltage5_raw, AM5729 in_voltage6_raw
  • 6 - AM3358 in_voltage6_raw, AM5729 in_voltage4_raw

PWM/TIMER/ECAP

/dev/bone/pwm/0

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM0-00A0.dts
AM3358 PWM0
AM5729 TIMER13/TIMER15

  • P9.22 - A
  • P9.21 - B

/dev/bone/pwm/1

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM1-00A0.dts
AM3358 PWM1
AM5279 PWM3

  • P9.14 - A
  • P9.16 - B

/dev/bone/pwm/2

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM2-00A0.dts
AM3358 PWM2
AM5729 PWM2

  • P8.19 - A
  • P8.13 - B

/dev/bone/timer/4

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM-TIMER-P8.07.dts
AM3358 TIMER4
AM5729 TIMER11

  • P8.7

/dev/bone/timer/5

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM-TIMER-P8.09.dts
AM3358 TIMER5
AM5729 TIMER14

  • P8.9

/dev/bone/timer/6

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM-TIMER-P8.10.dts
AM3358 TIMER6
AM5729 TIMER10

  • P8.10

/dev/bone/timer/7

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-PWM-TIMER-P8.08.dts
AM3358 TIMER7
AM5729 TIMER12

  • P8.8

/dev/bone/ecap/1

TODO
AM3358 N/A
AM5729 eCAP1_in_PWM1_out

  • P8.15

/dev/bone/ecap/2

TODO
AM3358 N/A
AM5729 eCAP2_in_PWM2_out

  • P8.14

/dev/bone/ecap/3

TODO
AM3358 N/A
AM5729 eCAP3_in_PWM3_out

  • P8.04

MMC

/dev/bone/mmc/2

TODO: need overlay. Note: On Black, this is used by the on-board eMMC. On AI, these pins are available.
AM3358 MMC2
AM5729 MMC3

  • P8.21 - CLK
  • P8.20 - CMD
  • P8.25 - DAT0
  • P8.24 - DAT1
  • P8.5 - DAT2
  • P8.6 - DAT3
  • P8.23 - DAT4
  • P8.22 - DAT5
  • P8.4 - DAT7
  • P8.3 - DAT6

LCD

TODO

eQEP

/dev/bone/eqep/0

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep0-00A0.dts
AM3358 eQEP0
AM5729 eQEP3

  • P9.42 - A
  • P9.27 - B
  • P9.25 - STROBE (N/A on AI)
  • P9.41 - INDEX (N/A on AI)
  • P8.6 - STROBE (N/A on AM3358)
  • P8.5 - INDEX (N/A on AM3358)

/dev/bone/eqep/1

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep1-00A0.dts
AM3358 eQEP1
AM5729 eQEP1

  • P8.34 - A
  • P8.36 - B
  • P9.21 - STROBE (N/A on AM3358)

/dev/bone/eqep/2

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep2b-00A0.dts
AM3358 eQEP2
AM5729 eQEP2

  • P8.12 - A
  • P8.11 - B
  • P8.15 - STROBE on AM3358 only
  • P8.18 - STROBE on AM5729 only
  • P8.16 - INDEX on AM3358 only
  • P9.15 - INDEX on AM5729 only

/dev/bone/eqep/2a

https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/bone_eqep2-00A0.dts
AM3358 eQEP2
AM5729 N/A'

  • P8.41 - A
  • P8.42 - B
  • P8.40 - STROBE
  • P8.39 - INDEX

McASP

TODO

PRU

The overlay situation for PRUs is a bit more complex than with other peripherals. The mechanism for loading, starting and stopping the PRUs can go through either UIO or RemoteProc.[3]

/dev/bone/pru/0.0

TODO
AM3358 PRU0
AM5729 PRUSS1, PRU0

  • P8.11 - out 15 on AM3358, I/O 4 on AM5729
  • P8.12 - out 14 on AM3358, I/O 3 on AM5729
  • P8.15 - eCAP, in 15 on AM3358, N/A on AM5729
  • P8.16 - in on AM3358, N/A on AM5729
  • P8.17 - N/A on AM3358, I/O 15 on AM5729
  • P9.15 - (N/A on AM3358)
  • P9.24 - (N/A on AM5729)
  • P9.25 - (pru/1.1 on AM5729)
  • P9.41 - (pru/0.1 on AM5729)
  • P9.42 - (pru/1.1 or pru2.0 on AM5279)
  • USR0 - (N/A on AM3358)
  • USR2 - (N/A on AM3358)
  • USR3 - (N/A on AM3358)
  • USR4 - (N/A on AM3358)

/dev/bone/pru/0.1

TODO
AM3358 PRU1
AM5279 PRUSS1, PRU1

  • P8.13 - N/A on AM3358, I/O 7 on AM5729
  • P8.14 - N/A on AM3358, I/O 9 on AM5729
  • P8.15 - N/A on AM3358, I/O 16 on AM5729
  • P8.16 - N/A on AM3358, I/O 18 on AM5729

/dev/bone/pru/1.0

TODO
AM3358 N/A
AM5729 PRUSS2, PRU0

  • P8.3 - I/O 10 (N/A on AM3358)
  • P8.4 - I/O 11 (N/A on AM3358)
  • P8.5 - I/O 5 (N/A on AM3358)
  • P8.6 - I/O 7 (N/A on AM3358)
  • P8.8 - I/O 20 (N/A on AM3358)

/dev/bone/pru/1.1

TODO
AM3358 N/A
AM5729 PRUSS2, PRU1

  • P8.7 - I/O 16 (N/A on AM3358)
  • P8.9 - I/O 6 (N/A on AM3358)
  • P8.10 - I/O 15 (N/A on AM3358)


GPIO

TODO
For each of the pins with a GPIO, there should be a symlink that comes from the names

Methodology

udev rules [4]

10-of-symlink.rules[5]

#From: https://github.com/mvduin/py-uio/blob/master/etc/udev/rules.d/10-of-symlink.rules
# allow declaring a symlink for a device in DT
ATTR{device/of_node/symlink}!="", \
	ENV{OF_SYMLINK}="%s{device/of_node/symlink}"

ENV{OF_SYMLINK}!="", ENV{DEVNAME}!="", \
	SYMLINK+="%E{OF_SYMLINK}", \
	TAG+="systemd", ENV{SYSTEMD_ALIAS}+="/dev/%E{OF_SYMLINK}"

TBD

#Also courtesy of mvduin
# create symlinks for gpios exported to sysfs by DT
SUBSYSTEM=="gpio", ACTION=="add", TEST=="value", ATTR{label}!="sysfs", \
        RUN+="/bin/mkdir -p /dev/gpio", \
        RUN+="/bin/ln -sT '/sys/class/gpio/%k' /dev/gpio/%s{label}"

References