net: dsa: microchip: Set SPI as bus interface during reset for KSZ8463

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[ Upstream commit a0b977a3d1 ]

At reset, the KSZ8463 uses a strap-based configuration to set SPI as
bus interface. SPI is the only bus supported by the driver. If the
required pull-ups/pull-downs are missing (by mistake or by design to
save power) the pins may float and the configuration can go wrong
preventing any communication with the switch.

Introduce a ksz8463_configure_straps_spi() function called during the
device reset. It relies on the 'straps-rxd-gpios' OF property and the
'reset' pinmux configuration to enforce SPI as bus interface.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20250918-ksz-strap-pins-v3-3-16662e881728@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Bastien Curutchet 2025-09-18 10:33:52 +02:00 • committed by Greg Kroah-Hartman

parent 8678a25b7a

commit 686fd7bad8

1 changed files with 45 additions and 0 deletions

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drivers/net/dsa/microchip/ksz_common.c

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