i2c: designware: Add doorbell support for Mendocino

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Mendocino and later platform don't use the platform feature mailbox for
communication for I2C arbitration, they rely upon ringing a doorbell.

Detect the platform by the device ID of the root port and choose the
appropriate method.

Link: https://lore.kernel.org/linux-i2c/20220916131854.687371-3-jsd@semihalf.com/
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Mark Hasemeyer <markhas@chromium.org>
Tested-by: Mark Hasemeyer <markhas@chromium.org>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Mario Limonciello 2023-04-14 09:40:08 -05:00 • committed by Herbert Xu

parent 440da737cf

commit 482c84e906

2 changed files with 26 additions and 1 deletions

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1

drivers/i2c/busses/Kconfig

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26

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

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