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Filename Latest commit message Latest commit date
Linus Walleij da7f134972 Revert "gpio/spi: Fix spi-gpio regression on active high CS" 
This reverts commit fbbf145a0e.

It seems I was misguided in my fixup, which was working at the
time but did not work on the final v5.2.

The patch tried to avoid a quirk the gpiolib code not to treat
"spi-gpio" CS gpios "special" by enforcing them to be active
low, in the belief that since the "spi-gpio" driver was
parsing the device tree on its own, it did not care to inspect
the "spi-cs-high" attribute on the device nodes.

That's wrong. The SPI core was inspecting them inside the
of_spi_parse_dt() funtion and setting SPI_CS_HIGH on the
nodes, and the driver inspected this flag when driving the
line.

As of now, the core handles the GPIO and it will consistently
set the GPIO descriptor to 1 to enable CS, strictly requireing
the gpiolib to invert it. And the gpiolib should indeed
enforce active low on the CS line.

Device trees should of course put the right flag on the GPIO
handles, but it used to not matter. If we don't enforce active
low on "gpio-gpio" we may run into ABI backward compatibility
issues, so revert this.

Cc: linux-spi@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20190715204529.9539-1-linus.walleij@linaro.org
2019-07-16 10:55:37 +02:00
arch Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-07-15 21:10:39 -07:00
block
certs
crypto
Documentation for-linus-20190715 2019-07-15 21:20:52 -07:00
drivers Revert "gpio/spi: Fix spi-gpio regression on active high CS" 2019-07-16 10:55:37 +02:00
fs for-linus-20190715 2019-07-15 21:20:52 -07:00
include for-linus-20190715 2019-07-15 21:20:52 -07:00
init
ipc
kernel pci-v5.3-changes 2019-07-15 20:44:49 -07:00
lib 5.3 Merge window RDMA pull request 2019-07-15 20:38:15 -07:00
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mm Revert "Merge branch 'vmwgfx-next' of git://people.freedesktop.org/~thomash/linux into drm-next" 2019-07-16 04:07:13 +10:00
net pci-v5.3-changes 2019-07-15 20:44:49 -07:00
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Makefile
README

README 

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.