This series Introduce a BPF based SPI mockup controller, which can be used for testing SPI drivers without real device. The testsuite for SPI drivers will be post in other series, with also support for I2C and PCI bus device drivers. patch 1-2 introduce BPF based SPI mockup controller patch 3 add the document v1->v2: Use the new _controller() API P1. Move the license identifier to the entrie comment P2. Inherit tx_nbits/rx_nbits/cs_off/cs_change from the spi_transfer to the tracepoint P3. Removed. P4. Update the Document. Wei Yongjun (3): spi: mockup: Add SPI controller testing driver spi: mockup: Add writeable tracepoint for spi transfer spi: mockup: Add documentation Documentation/spi/index.rst | 1 + Documentation/spi/spi-mockup.rst | 174 ++++++++++++++++++++ drivers/spi/Kconfig | 13 ++ drivers/spi/Makefile | 1 + drivers/spi/spi-mockup.c | 260 ++++++++++++++++++++++++++++++ include/linux/spi/spi-mockup.h | 17 ++ include/trace/events/spi_mockup.h | 31 ++++ 7 files changed, 497 insertions(+) create mode 100644 Documentation/spi/spi-mockup.rst create mode 100644 drivers/spi/spi-mockup.c create mode 100644 include/linux/spi/spi-mockup.h create mode 100644 include/trace/events/spi_mockup.h -- 2.34.1