i2c: rtl9300: add support for 50 kHz and 2.5 MHz bus speeds

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Some SFP modules on certain switches (for example the ONTi ONT-S508CL-8S and
XikeStor SKS8300-8X) exhibit unreliable I2C communication at the currently
supported speeds. Add support for 50 kHz and 2.5 MHz I2C bus modes on the
RTL9300 to improve compatibility with these devices.

Signed-off-by: Jan Kantert <jan-kernel@kantert.net>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260227111134.2163701-1-jan-kernel@kantert.net

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Jan Kantert 2026-02-27 12:11:34 +01:00 • committed by Andi Shyti

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commit 879766b58e

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drivers/i2c/busses/i2c-rtl9300.c

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