linux-stable.git/include/linux/spi/spi.h, branch linux-5.15.y

spi: Introduce spi_get_device_match_data() helper

2024-01-05T14:13:38+00:00

[ Upstream commit aea672d054a21782ed8450c75febb6ba3c208ca4 ]

The proposed spi_get_device_match_data() helper is for retrieving
a driver data associated with the ID in an ID table. First, it tries
to get driver data of the device enumerated by firmware interface
(usually Device Tree or ACPI). If none is found it falls back to
the SPI ID table matching.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20221020195421.10482-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown 
Stable-dep-of: ee4d79055aee ("iio: imu: adis16475: add spi_device_id table")
Signed-off-by: Sasha Levin

spi: Fix deadlock when adding SPI controllers on SPI buses

2021-10-14T11:47:29+00:00

Currently we have a global spi_add_lock which we take when adding new
devices so that we can check that we're not trying to reuse a chip
select that's already controlled.  This means that if the SPI device is
itself a SPI controller and triggers the instantiation of further SPI
devices we trigger a deadlock as we try to register and instantiate
those devices while in the process of doing so for the parent controller
and hence already holding the global spi_add_lock.  Since we only care
about concurrency within a single SPI bus move the lock to be per
controller, avoiding the deadlock.

This can be easily triggered in the case of spi-mux.

Reported-by: Uwe Kleine-König 
Signed-off-by: Mark Brown

spi: modify set_cs_timing parameter

2021-08-05T15:42:54+00:00

This patch modified set_cs_timing parameter, no need pass in spi_delay
to set_cs_timing callback.
By the way, we modified the mediatek and tegra114 spi driver to fix build err.
In mediatek spi driver, We have support set absolute time not clk_count,
and call this function in prepare_message not user's API.

Signed-off-by: Mason Zhang 
Link: https://lore.kernel.org/r/20210804133746.6742-1-Mason.Zhang@mediatek.com
Signed-off-by: Mark Brown

spi: move cs spi_delay to spi_device

2021-08-05T15:42:53+00:00

As we know, spi core layer has removed spi_set_cs_timing() API.
So this patch moved spi_delay for cs_timing from spi_controller
to spi_device, because cs timing should be set by spi_device but
not controller.

Signed-off-by: Mason Zhang 
Link: https://lore.kernel.org/r/20210804133716.32040-1-Mason.Zhang@mediatek.com
Signed-off-by: Mark Brown

spi: : add missing struct kernel-doc entry

2021-07-11T22:51:44+00:00

Fix kernel-doc warning in spi.h by adding the missing kernel-doc entry
and also correct the original comment so that they both indicate the
correct polarity of the flag.

../include/linux/spi/spi.h:673: warning: Function parameter or member 'devm_allocated' not described in 'spi_controller'

Fixes: 794aaf01444d ("spi: Fix use-after-free with devm_spi_alloc_*")
Signed-off-by: Randy Dunlap 
Cc: William A. Kennington III 
Cc: Mark Brown 
Cc: linux-spi@vger.kernel.org
Cc: Lukas Wunner 
Reviewed-by: Lukas Wunner 
Link: https://lore.kernel.org/r/20210628210520.5712-1-rdunlap@infradead.org
Signed-off-by: Mark Brown

spi: core: add dma_map_dev for dma device

2021-06-25T11:26:49+00:00

Some controllers like qcom geni need the parent device to be used for
dma mapping, so add a dma_map_dev field and let drivers fill this to be
used as mapping device

Signed-off-by: Vinod Koul 
Link: https://lore.kernel.org/r/20210625052213.32260-4-vkoul@kernel.org
Signed-off-by: Mark Brown

spi: add ancillary device support

2021-06-22T11:54:59+00:00

Introduce support for ancillary devices, similar to existing
implementation for I2C. This is useful for devices having
multiple chip-selects, for example some microcontrollers
provide a normal SPI interface and a flashing SPI interface.

Signed-off-by: Sebastian Reichel 
Link: https://lore.kernel.org/r/20210621175359.126729-2-sebastian.reichel@collabora.com
Signed-off-by: Mark Brown

spi: remove spi_set_cs_timing()

2021-06-09T10:55:46+00:00

No one seems to be using this global and exported function, so remove it
as it is no longer needed.

Cc: Mark Brown 
Signed-off-by: Greg Kroah-Hartman 
Link: https://lore.kernel.org/r/20210609071918.2852069-1-gregkh@linuxfoundation.org
Signed-off-by: Mark Brown

spi: Switch to signed types for *_native_cs SPI controller fields

2021-05-11T09:05:40+00:00

While fixing undefined behaviour the commit f60d7270c8a3 ("spi: Avoid
undefined behaviour when counting unused native CSs") missed the case
when all CSs are GPIOs and thus unused_native_cs will be evaluated to
-1 in unsigned representation. This will falsely trigger a condition
in the spi_get_gpio_descs().

Switch to signed types for *_native_cs SPI controller fields to fix above.

Fixes: f60d7270c8a3 ("spi: Avoid undefined behaviour when counting unused native CSs")
Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20210510131242.49455-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown

Merge branch 'for-5.12' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.13

2021-04-15T18:29:40+00:00