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Integrate linux-guf/linux-5.15.29-guf-fix-rs485-for-mx6ull-2

GitBot requested to merge integrate/linux-guf/linux-5.15.29-guf-fix-rs485-for-mx6ull-2/into/kirkstone into kirkstone

Commit: seco-ne/kernel/linux-guf@f049bdc6

arm:dts:nallino: activate fix for rs485 latency issue

Signed-off-by: Mikhail Vanyulin mikhail.vanyulin@rtsoft.de

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Commit: seco-ne/kernel/linux-guf@f1fc8b71

tty:serial:imx: fix uart latency for rs485 on mx6ull

There is too big latency (up to 3ms) in rs485 mode on mx6ull during turning To receive between disabling transmitter and enabling receiver. It happens because of 3 sequential iterations of calling stop_tx (2 from irq thread and 1 from hrtimer). Irq thread has great latency on the slow mx6ull and RS485 is sensitive to timings. The patch involves hrtimer for calling stop_tx during waiting FIFO empty in addition to existing calls from softirq to speed up the process.

To make new code apply only for specific devices and not to affect other boards, a "rs485-has-rts-latency" property for uart device tree node was added.

Signed-off-by: Mikhail Vanyulin mikhail.vanyulin@rtsoft.de

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