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    serial: Make retrieval of rs485 properties platform-agnostic · 743f93f8
    Lukas Wunner 提交于
    Commit ef838a81 ("serial: Add common rs485 device tree parsing
    function") consolidated retrieval of rs485 OF properties in a common
    helper function but did not #ifdef it to CONFIG_OF.  The function is
    therefore included on ACPI platforms as well even though it's not used.
    
    On the other hand ACPI platforms with rs485 do exist (e.g. Siemens
    IOT2040) and they may leverage _DSD to store rs485 properties.  Likewise,
    UART platform devices instantiated from an MFD should be able to specify
    rs485 properties.  In fact, the tty subsystem maintainer had asked for
    a "generic" function during review of commit ef838a81:
    https://marc.info/?l=linux-serial&m=150143441725194&w=4
    
    Thus, instead of constraining the helper to OF platforms, make it
    platform-agnostic by converting it to device_property_*() functions
    and renaming it accordingly.
    
    In imx.c, move the invocation of uart_get_rs485_mode() from
    serial_imx_probe_dt() to serial_imx_probe() so that it also gets called
    for non-OF devices.
    
    In omap-serial.c, move its invocation further up within
    serial_omap_probe_rs485() so that the RTS polarity can be overridden
    with the driver-specific "rs485-rts-active-high" property once we
    introduce a generic "rs485-rts-active-low" property.
    
    Cc: Jan Kiszka <jan.kiszka@siemens.com>
    Cc: Richard Genoud <richard.genoud@gmail.com>
    Cc: Sascha Hauer <s.hauer@pengutronix.de>
    Signed-off-by: NLukas Wunner <lukas@wunner.de>
    Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
    Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    743f93f8
serial_core.h 16.0 KB