• Sergey Yanovich's avatar
    serial: rewrite pxa2xx-uart to use 8250_core · ab28f51c
    Sergey Yanovich authored
    pxa2xx-uart was a separate uart platform driver. It was declaring
    the same device names and numbers as 8250 driver. As a result,
    it was impossible to use 8250 driver on PXA SoCs.
    
    Upon closer examination pxa2xx-uart turned out to be a clone of
    8250_core driver.
    
    Workaround for Erratum #19 according to Marvel(R) PXA270M Processor
    Specification Update (April 19, 2010) is dropped. 8250_core reads
    from FIFO immediately after checking DR bit in LSR.
    
    The patch leaves the original SERIAL_PXA driver around. The original
    driver is just marked DEPRECATED in Kconfig and C source. When
    the original driver is considered safe to remove, no changes
    to SERIAL_8250 will be necessary.
    
    Compiling SERIAL_8250_CONSOLE and SERIAL_PXA_CONSOLE even without
    SERIAL_8250_PXA breaks console for SERIAL_PXA. For this reasons, the new
    and the original drivers are made mutually exclusive.
    Signed-off-by: default avatarSergei Ianovich <ynvich@gmail.com>
    CC: Heikki Krogerus <heikki.krogerus@linux.intel.com>
    CC: James Cameron <quozl@laptop.org>
    CC: Robert Jarzmik <robert.jarzmik@free.fr>
    CC: Russell King <linux@arm.linux.org.uk>
    Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
    [rebased on v4.8]
    Tested-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
    Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    ab28f51c
8250_pxa.c 3.99 KB