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Actually, there's no extra clock pulse to wait for. The assumption of an extra clock pulse was mistakenly derived from the fact that by the time this driver was introduced the GPIO controller of the test machine (bcm2835) generated spurious interrupts. Since now spurious interrupts are handled properly this can and must be removed in order to make TX xfers work properly. While at it, remove duplicate gpiod_direction_input(). The data gpio must already be configured to act as input when receiving the ACK bit. This patch is tested with the original hardware (peripherals and board) the driver was developed on. Signed-off-by: Danilo Krummrich <danilokrummrich@dk-develop.de> Link: https://lore.kernel.org/r/20220215160208.34826-4-danilokrummrich@dk-develop.de Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> |
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| certs | ||
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.