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Implement target mode for the DesignWare controller with the following changes: Allocate an SPI controller of the correct type based on the spi-slave property in dw_spi_add_controller() and set the controller properties depending on its type. Since they are only relevant when acting as a host controller, settings related to chip-select control and the set_cs() callback are only set in host mode, as are the loopback support, the memory operations and the maximum frequency. The target_abort() callback is set only when configured in target mode. The number of chip-select is set to 1 in dw_spi_hw_init() since the controller only has one CS input in target mode. In dw_spi_update_config(), return after setting the CTRLR0 register as the other registers are only relevant in host mode and are read-only in target mode. This function is called as part of the transfer_one() callback, which is identical in both the host and target mode. Move the code implementing the handle_err() callback to a new function named dw_spi_abort(), and use it to implement both the handle_err() and the target_abort() callbacks. Finally, drop the error path on the spi-slave property in dw_spi_mmio_probe(), as it is now a valid configuration. Signed-off-by: Benoît Monin <benoit.monin@bootlin.com> Link: https://patch.msgid.link/20251002-spi-dw-target-v1-2-993e91c1a712@bootlin.com Signed-off-by: Mark Brown <broonie@kernel.org>
Linux kernel
============
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