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ftdi_ft4222: Re-order pin numbering and support i2c switch

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First four pins (0 to 3) are now built-in FTDI GPIO/I2C pins
If i2c GPIO expander is detected, next 8 pins (4 to 11) are its GPIO
If i2c switch is detected an extra 4 i2c busses are added

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Henry Bruce
2016-01-05 13:34:37 -08:00
committed by Brendan Le Foll
parent ed0124cc70
commit 8c40842e4b
2 changed files with 313 additions and 181 deletions
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37
docs/ftdi_ft4222.md
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@@ -23,8 +23,41 @@ Supported GPIO expanders:
* PCA9555
* PCF8575
When a GPIO expander is present, the pins on the expander will be initialized
first and the 4 GPIO pins on the FT4222H are appended after.
Output from 'mraa-gpio list' would be as follows:
~~~~~~~~~~~~~
512 IGPIO0/SCL0: GPIO I2C
513 IGPIO1/SDA0: GPIO I2C
514 INT-GPIO2: GPIO
515 INT-GPIO3: GPIO
~~~~~~~~~~~~~
When an I2C GPIO expander is present, the pins on the expander will appear after
the 4 FT4222H GPIO pins (i.e. starting at physical pin #4, logical pin #516).
~~~~~~~~~~~~~
512 IGPIO0/SCL0: GPIO I2C
513 IGPIO1/SDA0: GPIO I2C
514 INT-GPIO2: GPIO
515 INT-GPIO3: GPIO
516 EXP-GPIO0: GPIO
517 EXP-GPIO1: GPIO
518 EXP-GPIO2: GPIO
519 EXP-GPIO3: GPIO
520 EXP-GPIO4: GPIO
521 EXP-GPIO5: GPIO
522 EXP-GPIO6: GPIO
523 EXP-GPIO7: GPIO
~~~~~~~~~~~~~
If a PCA9545 I2C switch is detected an extra four I2C busses will appear,
representing the four downstream busses. Output from 'mraa-i2c list'
would be as follows:
~~~~~~~~~~~~~
Bus 512: id=00 type=ft4222 default
Bus 513: id=01 type=ft4222
Bus 514: id=02 type=ft4222
Bus 515: id=03 type=ft4222
Bus 516: id=04 type=ft4222
~~~~~~~~~~~~~
Please note that some mraa features might not be fully implemented yet and they
are still under development (e.g. SPI replacement functions).