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Subject: Re: [RFC PATCH v3 3/3] SPI: Add virtio SPI driver.
Hello Haixu,I was on vacation, therefore no immediate answer. I should not forget to set an OOO reply before going to vacation.
On 20.02.24 09:30, Haixu Cui wrote:
Hello Harald,ÂÂÂ Do you add the "spi-virtio" in spidev_spi_ids in spidev.c when you doing the tests? And any other method to expose the spidev interface to userspace?+static struct spi_board_info board_info = { +ÂÂÂ .modalias = "spi-virtio", +}; +
I've a udev rule 50-spi-virtio.rules installed which does the job: # Bind spi-virtio device spiB.C to user mode SPI device /dev/spidevB.C # Requires spi driver_override sysfs entry (Linux version 4.20+ and later) ## See also https://www.mail-archive.com/debian-arm@lists.debian.org/msg22090.html
# and Documentation/spi/spidev.rst ##ACTION=="add", SUBSYSTEM=="spi", ENV{MODALIAS}=="spi:spi-virtio", PROGRAM+="/bin/sh -c 'echo spidev > %S%p/driver_override && echo %k > %S%p/subsystem/drivers/spidev/bind" ACTION=="add", SUBSYSTEM=="spi", ENV{MODALIAS}=="spi:spi-virtio", PROGRAM+="/bin/sh -c 'echo spidev > %S%p/driver_override && echo %k > %S/bus/spi/drivers/spidev/bind"
There are no other kernel changes.However for ancient Linux 4.14 there is no udev rule and the board_info looks, there
ÂÂÂ .modalias = "spidev", /* Must be "spidev" for user mode SPI */but this is only for old kernels we're still using in some setup and this is irrelevant at latest with 5.14.14 where was a documentation update of Documentation/spi/spidev.rst.
Regards Harald Mommer
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