efc92fbb87
This converts the Atmel SPI master driver to use GPIO descriptors for chip select handling. The Atmel driver has duplicate code to look up and initialize CS GPIOs from the device tree, so this is removed. It further has code to retrieve a CS GPIO from .controller_data but this seems to be completely unused in the kernel (legacy codepath?) so I deleted this support. It keeps track of polarity when switching the CS, but this is not needed anymore since we moved this over to the gpiolib. The local handling of the "npcs_pin" (I guess this might mean "negative polarity chip select pin") is preserved, but I strongly suspect this can be switched over to handling by the core and using the SPI_MASTER_GPIO_SS flag on the master to assure that the additional CS handling in the driver is also done. Cc: Eugen Hristev <eugen.hristev@microchip.com> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Radu Pirea <radu.pirea@microchip.com> Cc: Linuxarm <linuxarm@huawei.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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.