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Commitf3186dd876("spi: Optionally use GPIO descriptors for CS GPIOs") amended of_spi_parse_dt() to always set SPI_CS_HIGH for SPI slaves whose Chip Select is defined by a "cs-gpios" devicetree property. This change breaks drivers whose probe functions set the mode field of the spi_device because in doing so they clear the SPI_CS_HIGH flag. Fix by setting SPI_CS_HIGH in spi_setup (under the same conditions as in of_spi_parse_dt()). See also:83b2a8fe43("spi: spidev: Fix CS polarity if GPIO descriptors are used") Fixes:f3186dd876("spi: Optionally use GPIO descriptors for CS GPIOs") Signed-off-by: Phil Elwell <phil@raspberrypi.com> SQUASH: spi: Demote SPI_CS_HIGH warning to KERN_DEBUG This warning is unavoidable from a client's perspective and doesn't indicate anything wrong (just surprising). SQUASH with "spi: use_gpio_descriptor fixup moved to spi_setup" Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Linux kernel
There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.
In order to build the documentation, use make htmldocs or
make pdfdocs. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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