riscv: dts: sophgo: reduce SG2042 MSI count to 16

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The SG2042 MSI controller has one 32-bit doorbell register, and each bit
corresponds to an interrupt. At a glance, it seems that the MSI
controller can support 32 interrupts; however the PCI MSI capability
only supports 16-bit messages, which makes the high 16 interrupts
unusable in such way.

Reduce the MSI count to 16 to prevent producing MSI message values that
cannot fit 16-bit integers.

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Reviewed-by: Chen Wang <unicorn_wang@outlook.com>
Tested-by: Chen Wang <unicorn_wang@outlook.com> on Pioneerbox.
Link: https://patch.msgid.link/20260407160143.1182430-1-zhengxingda@iscas.ac.cn
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

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Icenowy Zheng 2026-04-08 00:01:43 +08:00 • committed by Inochi Amaoto

parent a7e6589076

commit 903a9364e4

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arch/riscv/boot/dts/sophgo/sg2042.dtsi

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