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Shiji Yang f07798d7bb gpio: mmio: do not calculate bgpio_bits via "ngpios"
bgpio_bits must be aligned with the data bus width. For example, on a
32 bit big endian system and we only have 16 GPIOs. If we only assume
bgpio_bits=16 we can never control the GPIO because the base address
is the lowest address.

low address                          high address
-------------------------------------------------
|   byte3   |   byte2   |   byte1   |   byte0   |
-------------------------------------------------
|    NaN    |    NaN    |  gpio8-15 |  gpio0-7  |
-------------------------------------------------

Fixes: 55b2395e4e ("gpio: mmio: handle "ngpios" properly in bgpio_init()")
Fixes: https://github.com/openwrt/openwrt/issues/15739
Reported-by: Mark Mentovai <mark@mentovai.com>
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Suggested-By: Mark Mentovai <mark@mentovai.com>
Reviewed-by: Jonas Gorski <jonas.gorski@gmail.com>
Tested-by: Lóránd Horváth <lorand.horvath82@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/TYCP286MB089577B47D70F0AB25ABA6F5BCD52@TYCP286MB0895.JPNP286.PROD.OUTLOOK.COM
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2024-07-03 15:27:59 +02:00
arch x86-32: fix cmpxchg8b_emu build error with clang 2024-06-30 09:21:29 -07:00
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Documentation Kbuild fixes for v6.10 (third) 2024-06-30 10:00:01 -07:00
drivers gpio: mmio: do not calculate bgpio_bits via "ngpios" 2024-07-03 15:27:59 +02:00
fs Bug fixes for 6.10-rc6: 2024-06-29 09:21:40 -07:00
include ata fixes for 6.10-rc6 2024-06-30 14:32:24 -07:00
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lib hardening fixes for v6.10-rc6 2024-06-28 16:11:02 -07:00
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MAINTAINERS IOMMU Fixes for Linux v6.10-rc5 2024-06-28 09:18:01 -07:00
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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 reStructuredText 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.