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minnowboard: add chardev support

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Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
Signed-off-by: malikabhi05 <abhishek.malik@intel.com>
This commit is contained in:
Mihai Tudor Panu
2018-04-12 11:14:41 -07:00
committed by malikabhi05
parent 72f1ffca31
commit bdd00e10ed
2 changed files with 49 additions and 33 deletions
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19
docs/minnow_max.md
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@@ -12,21 +12,23 @@ legacy board https://www.minnowboard.org/minnowboard-max
Supported Firmware
------------------
mraa has only been tested with 64 bit firmware version 0.73 or later.
MRAA has only been tested with 64 bit firmware version 0.73 or later.
SPI
---
For SPI support you need to load the low_speed_spidev kernel module and that
will create the /dev/spidev0.0 device node. Mraa only knows about this one SPI
will create the /dev/spidev0.0 device node. MRAA only knows about this one SPI
bus and no other.
Interface notes
---------------
The low speed I/O connector supported as per table below. This assumes default
BIOS settings, as they are not dynamcially detected If any changes are mode
(Device Manager -> System Setup -> South Cluster -> LPSS & CSS) them mraa calls
(Device Manager -> System Setup -> South Cluster -> LPSS & CSS) them MRAA calls
will not behave as expected.
The platform is chardev capable on newer kernels.
Documentation shows i2c on bus #5, ACPI shows it on bus #6, but driver uses
bus #7.
@@ -60,3 +62,14 @@ bus #7.
| 26 | 26 | IBL_8254 | 208 | GPIO / I2S MCLK (tb) |
*(tb) New assignment on the MinnowBoard Turbot
** On 3.18+ kernels, sysfs GPIO numbers are computed using:
`new_value = old_value | 0x100`
User LED
---------------
The MinnowBoard Turbot has one user programmable built-in LED. This is exposed
as a GPIO from MRAA.
| MRAA Number | Physical Pin | Function | Sysfs GPIO | Notes |
|-------------|---------------|------------|------------|----------------------|
| 27 | N/A | D2_LED | 104 | Active low |