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SubjectHow to use CONFIG_SERIAL_8250_SHARE_IRQ with device tree ?
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Hello, experts.

I am porting my board support for the latest kernel.


The 16550 UART device on my board (ARM architecture)
shares an IRQ line with an ethernet device.


With both devices enabled, I got an error message like this:

genirq: Flags mismatch irq 18. 00000080 (serial) vs. 00000084 (eth0)


I am working on Linux 4.0 with device tree configuration.

Is there any solution?


When I used an old kernel with a board file,
I could use CONFIG_SERIAL_8250_SHARE_IRQ.

I gave it a try on the latest kernel, but it looked like no effect for me.

As I use device tree configuration, the UART is initialized
via drivers/tty/serial/of_serial.c

If CONFIG_SERIAL_8250_SHARE_IRQ is on, IRQF_SHARED is set
in serial8250_probe(), but this function is only for
pre-device-tree old boards, I think.


Is CONFIG_SERIAL_8250_SHARE_IRQ no longer supported
for DTS-configured boards?

Any hint is appreciated.

--
Best Regards
Masahiro Yamada


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