i2c: designware: Introduce shutdown exported function

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Introduce an exported shutdown function to safely shutdown the
DesignWare I2C controller.

This shutdown hook gracefully sets the target disable bit before disabling
the controller. This guarantees that any incoming requests from the
controller are immediately NACKed during shutdown, preventing the bus from
hanging.

Signed-off-by: William A. Kennington III <william@wkennington.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260527-dw-i2c-v5-1-3483057f8d67@wkennington.com

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William A. Kennington III 2026-05-27 20:09:49 +00:00 • committed by Andi Shyti

parent 24435f4c8c

commit 199a0fd953

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24

drivers/i2c/busses/i2c-designware-common.c

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1

drivers/i2c/busses/i2c-designware-core.h

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