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Document the new_device and delete_device sysfs attributes on SPI
controllers:
- Documentation/spi/instantiating-devices.rst: describes when and
why this interface is needed, accepted parameters, usage examples,
and limitations.
- Documentation/ABI/testing/sysfs-class-spi-master: formal ABI
entry for both attributes.
Signed-off-by: Vishwaroop A <va@nvidia.com>
Link: https://patch.msgid.link/20260803104614.2548375-3-va@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
What: /sys/class/spi_master/spiB/new_device
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Date: July 2026
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KernelVersion: 7.3
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Contact: linux-spi@vger.kernel.org
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Description: (WO) Instantiate a new SPI device on bus B, where B
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is the bus number (0, 1, 2, ...). Takes parameters
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in the format:
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<modalias> <chip_select> [<max_speed_hz> [<mode>]]
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where modalias is the driver name, chip_select is the
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CS line number, and max_speed_hz and mode are optional.
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The device can later be removed with delete_device.
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Only devices created via this interface can be removed
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with delete_device; platform and DT devices are not
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affected.
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Example:
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# echo spidev 0 > /sys/class/spi_master/spi0/new_device
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# echo spidev 0 10000000 > /sys/class/spi_master/spi0/new_device
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# echo spidev 0 10000000 3 > /sys/class/spi_master/spi0/new_device
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What: /sys/class/spi_master/spiB/delete_device
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Date: July 2026
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KernelVersion: 7.3
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Contact: linux-spi@vger.kernel.org
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Description: (WO) Remove a SPI device previously created via
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new_device. Takes a single parameter: the chip select
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number of the device to remove.
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Example:
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# echo 0 > /sys/class/spi_master/spi0/delete_device
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