spi: allow ancillary devices to share parent's chip selects

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When registering an ancillary SPI device, the current code flags a chip
select conflict with the parent device. This happens because the
ancillary device intentionally uses one of the parent's chip selects,
but __spi_add_device() checks against all existing devices including
the parent.

Allow this by passing the parent device pointer to __spi_add_device()
and skipping the conflict check when the existing device is the parent.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/bcb1eb34fc5e86fd5dbb4472ad1d3ea3cf3e9779.1770393792.git.antoniu.miclaus@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Antoniu Miclaus 2026-02-06 18:07:13 +02:00 • committed by Mark Brown

parent 6de23f81a5

commit ffef412304

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1 changed files with 23 additions and 6 deletions

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drivers/spi/spi.c

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