• Martin Blumenstingl's avatar
    pinctrl: meson: fix uart_ao_b for GXBB and GXL/GXM · b27e3648
    Martin Blumenstingl authored
    The GXBB and GXL/GXM pinctrl drivers had a configuration which conflicts
    with uart_ao_a. According to the GXBB ("S905") datasheet the AO UART
    functions are:
    - GPIOAO_0: Func1 = UART_TX_AO_A (bit 12), Func2 = UART_TX_AO_B (bit 26)
    - GPIOAO_1: Func1 = UART_RX_AO_A (bit 11), Func2 = UART_RX_AO_B (bit 25)
    - GPIOAO_4: Func2 = UART_TX_AO_B (bit 24)
    - GPIOAO_5: Func2 = UART_RX_AO_B (bit 25)
    
    The existing definition for uart_AO_A already uses GPIOAO_0 and GPIOAO_1.
    The old definition of uart_AO_B however was broken, as it used GPIOAO_0
    for TX (which would be fine) and two pins (GPIOAO_1 and GPIOAO_5) for RX
    (which does not make any sense).
    
    This fixes the uart_AO_B configuration by moving it to GPIOAO_4 and
    GPIOAO_5 (it would be possible to use GPIOAO_0 and GPIOAO_1 in theory,
    but all existing hardware uses uart_AO_A there).
    The fix for GXBB and GXL/GXM is identical since it seems that these
    specific pins are identical on both SoC variants.
    Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
    Reviewed-by: default avatarKevin Hilman <khilman@baylibre.com>
    Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
    b27e3648
pinctrl-meson-gxbb.c 23.8 KB