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This converts the Orion SPI master to use GPIO descriptors. The SPI core will obtain and manage the CS GPIOs, if any are defined. I make one sematic change: when a certain chip select is using a GPIO line instead of the native CS I simply just enable the 1:1 mapped native CS that would have been used if the GPIO was not there. As we set the SPI_MASTER_GPIO_SS the .set_cs() callback will be called for all chip selects whether native or not, and the important thing for the driver is that the previous native chip select (if any) is deasserted, which other chip select is asserted instead does not really matter. The previous code went to great lengths to ascertain that the first hw CS which was hiding behind a GPIO line was used for all cases when the line is not using native chip select but this should not matter at all, just use the one "underneath" the GPIO at all times. When a GPIO is used for CS, the SPI_CS_HIGH flag is enforced, so the native chip select is also inverted. But that should not matter since we are not using it anyways. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Gregory CLEMENT <gregory.clement@bootlin.com> Cc: Tomas Paukrt <tomaspaukrt@email.cz> Cc: Jan Kundrát <jan.kundrat@cesnet.cz> Link: https://lore.kernel.org/r/20200415175613.220767-1-linus.walleij@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
Linux kernel
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