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The documentation is referring to the legacy enumeration of the SPI
host controllers and target devices. It has nothing to do with the
modern way, which is the only supported in kernel right now. Hence,
remove outdated documentation file.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240417110334.2671228-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Merge series from Andy Shevchenko <andriy.shevchenko@linux.intel.com>:
A couple of cleanups against linux/spi/pxa2xx_spi.h.
I'm sending this as v3 to land in the SPI subsystem. Meanwhile I'm
preparing an update to make linux/spi/pxa2xx_spi.h private to the
subsystem (PXA2xx driver). But the second part will be presented later
on (likely after v6.9-rc1). That said, this can be routed either via
SoC tree or SPI, up to respective maintainers.
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There are no more users of the deprecated is_dma_mapped in struct
spi_message so it can be removed.
References in documentation and comments are also removed.
A few similar checks if xfer->tx_dma or xfer->rx_dma are not NULL are
also removed since these are now guaranteed to be NULL because they
were previously set only if is_dma_mapped was true.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://msgid.link/r/20240325-spi-remove-is_dma_mapped-v2-1-d08d62b61f1c@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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There is no use for whole 16-bit for the number of chip select pins.
Drop it to 8 bits.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240307195056.4059864-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Update DMA mapping and using logic in the documentation to follow what
the code does.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231208170436.3309648-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Replace master/slave by host/peripheral language in the documentation.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231208170436.3309648-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Correct spelling problems for Documentation/spi/ as reported
by codespell.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230127064005.1558-28-rdunlap@infradead.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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This converts the PXA2xx SPI driver to use GPIO descriptors
exclusively to retrieve GPIO chip select lines.
The device tree and ACPI paths of the driver already use
descriptors, hence ->use_gpio_descriptors is already set and
this codepath is well tested.
Convert all the PXA boards providing chip select GPIOs as
platform data and drop the old GPIO chipselect handling in
favor of the core managing it exclusively.
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220125005836.494807-1-linus.walleij@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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There is no user of the enable_loopback member in the struct pxa2xx_spi_chip.
Remote this legacy member completely.
The mentioned in the documentation the testing phase can be performed with
spidev_test tool.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211123192723.44537-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Since the last user of the custom ->cs_control() gone, we may get rid of
this legacy API completely.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211123192723.44537-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Update documentation by pointing out that it's applicable mostly
for a legacy platform. While at it, add couple of points with regard
to ACPI, Device Tree, and automatic DMA enablement.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210517140351.901-9-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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While there's one file there with briefily describes the uAPI,
the documentation was written just like most subsystems: focused
on kernel developers. So, add it together with driver-api books.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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