• Linus Walleij's avatar
    spi: gpio: Add SPI_MASTER_GPIO_SS flag · 2922d1cc
    Linus Walleij authored
    The GPIO SPI master has some code in its local CS
    callback to set the initial sck GPIO value. This was
    lost in the commit converting it to use SPI core
    GPIO handling as this callback isn't called if the
    internal GPIO handling is active.
    
    Add the special SPI_MASTER_GPIO_SS to ascertain it
    gets called anyway so we get the initial SCK setting
    right. There is some platform provided GPIO handling
    there as well but this will be skipped as the cs_gpios
    will be NULL.
    
    My test targets seem not to care about the initial
    SCK value so I am uncertain if this is a regression,
    but to preserve the previous semantic we better do
    this.
    
    Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
    Fixes: 249e2632
    
     ("spi: gpio: Don't request CS GPIO in DT use-case")
    Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
    Link: https://lore.kernel.org/r/20190716204651.7743-1-linus.walleij@linaro.org
    
    Signed-off-by: default avatarMark Brown <broonie@kernel.org>
    2922d1cc
spi-gpio.c 13 KB