From: Robert Marko robert.marko@sartura.hr
[ Upstream commit 6287982aa54946449bccff3e6488d3a15e458392 ]
LAN969x switchdev support depends on the SparX-5 core,so make it selectable for ARCH_LAN969X.
Signed-off-by: Robert Marko robert.marko@sartura.hr Reviewed-by: Daniel Machon daniel.machon@microchip.com Link: https://patch.msgid.link/20250917110106.55219-1-robert.marko@sartura.hr Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org ---
LLM Generated explanations, may be completely bogus:
YES. The change extends the `SPARX5_SWITCH` Kconfig dependency so the switch core can be enabled when building for `ARCH_LAN969X` (`drivers/net/ethernet/microchip/sparx5/Kconfig:6`). Without it, the LAN969x-specific driver entry `config LAN969X_SWITCH`, which is compiled into the same `sparx5-switch.ko`, cannot even be selected because it depends on `SPARX5_SWITCH` (`drivers/net/ethernet/microchip/sparx5/Kconfig:28-31` and `drivers/net/ethernet/microchip/sparx5/Makefile:1-23`). That prevents any LAN969x system—the SoC is defined under `ARCH_LAN969X` (`arch/arm64/Kconfig.platforms:187-201`)—from instantiating the SparX-5 core that the LAN969x code relies on (for example the `lan969x_fdma_init()` path in `drivers/net/ethernet/microchip/sparx5/lan969x/lan969x_fdma.c:357-392` or the LAN969x DT match wired into the SparX-5 platform driver in `drivers/net/ethernet/microchip/sparx5/sparx5_main.c:1116-1136`). In practice this means current stable kernels that already merged LAN969x support ship a non-functional configuration knob—akin to a build regression—because the required core can’t be enabled. The fix is a single Kconfig dependency tweak with no runtime side effects and no architectural churn, making it a low-risk, high-value backport that unblocks hardware support.
drivers/net/ethernet/microchip/sparx5/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/microchip/sparx5/Kconfig b/drivers/net/ethernet/microchip/sparx5/Kconfig index 35e1c0cf345ea..a4d6706590d25 100644 --- a/drivers/net/ethernet/microchip/sparx5/Kconfig +++ b/drivers/net/ethernet/microchip/sparx5/Kconfig @@ -3,7 +3,7 @@ config SPARX5_SWITCH depends on NET_SWITCHDEV depends on HAS_IOMEM depends on OF - depends on ARCH_SPARX5 || COMPILE_TEST + depends on ARCH_SPARX5 || ARCH_LAN969X || COMPILE_TEST depends on PTP_1588_CLOCK_OPTIONAL depends on BRIDGE || BRIDGE=n select PHYLINK