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authorGeert Uytterhoeven <geert+renesas@glider.be>2017-12-13 20:05:12 +0100
committerMark Brown <broonie@kernel.org>2017-12-14 11:46:14 +0000
commitb8761434bdec32fa46a644c26a12d16a9b0f58d8 (patch)
treeb8007881f64e76e6c969069844c6d554c16ce389 /Documentation
parent9cce882bedd2768dc251b73f2ad86a9bfcfd9fc7 (diff)
spi: sh-msiof: Implement cs-gpios configuration
The current support for GPIO chip selects assumes the GPIOs have been configured by platform code or the boot loader. This includes pinmux setup and GPIO direction. Hence it does not work as expected when just described in DT using the "cs-gpios" property. Fix this by: 1. using devm_gpiod_get_index() to request the GPIO, and thus configure pinmux, if needed, 2. configuring the GPIO direction is the spi_master.setup() callback. Use gpio_is_valid() instead of a check on positive numbers. Note that when using GPIO chip selects, at least one native chip select must be left unused, as that native chip select will be driven anyway, and (global) native chip select polarity must be taken into account. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
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