• Przemyslaw Marczak's avatar
    exynos5-dt-types: add board detection for Odroid XU3/XU3L/XU4. · 1611c8cb
    Przemyslaw Marczak authored
    This commit adds additional file with implementation of board
    detection code for Odroid-XU3/XU4.
    The detection depends on compatible found in fdt:
    - "samsung,exynos5" - uses Exynos5 generic code
    - "samsung,odroidxu3" - try detect XU3 revision
    There are few revisions of Odroid XU3/XU4, each can be detected
    by checking the value of channel 9 of built-in ADC:
     Rev   ADC  Board
     0.1     0  XU3 0.1
     0.2   372  XU3 0.2 | XU3L - no DISPLAYPORT
     0.3  1280  XU4 0.1
    The detection code depends on the ADC+10% value.
    Implementation of functions:
    - set_board_type()     - read ADC and set type
    - get_board_rev()      - returns board revision: 1..3
    - get_board_type()     - returns board type string
    Additional functions with return values of bool:
    - board_is_generic()   - true if found compatible "samsung,exynos5"
                             but not "samsung,odroidxu3"
    - board_is_odroidxu3() - true if found compatible "samsung,odroidxu3"
                             and one of XU3 revision.
    - board_is_odroidxu4() - true if found compatible "samsung,odroidxu3"
                             and XU4 revision.
    After I2C controller init, the get_board_type() can check
    if the XU3 board is a "Lite" variant, by probing chip
    0x40 on I2C0 (INA231 - exists only on non-lite).
    This is useful for setting fdt file name at misc_init_r().
    Enabled configs:
    Signed-off-by: default avatarPrzemyslaw Marczak <p.marczak@samsung.com>
    Cc: Minkyu Kang <mk7.kang@samsung.com>
    Cc: Simon Glass <sjg@chromium.org>
    Tested-by: default avatarAnand Moon <linux.amoon@gmail.com>
    Signed-off-by: default avatarMinkyu Kang <mk7.kang@samsung.com>
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