mailbox: add MediaTek GPUEB IPI mailbox

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The MT8196 SoC uses an embedded MCU to control frequencies and power of
the GPU. This controller is referred to as "GPUEB".

It communicates to the application processor, among other ways, through
a mailbox.

The mailbox exposes one interrupt, which appears to only be fired when a
response is received, rather than a transaction is completed. For us,
this means we unfortunately need to poll for txdone.

The mailbox also requires the EB clock to be on when touching any of the
mailbox registers.

Add a simple driver for it based on the common mailbox framework.

Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

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Nicolas Frattaroli 2025-10-03 22:15:06 +02:00 • committed by Jassi Brar

parent d3e35a151a

commit dbca0eabb8

3 changed files with 331 additions and 0 deletions

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10

drivers/mailbox/Kconfig

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2

drivers/mailbox/Makefile

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319

drivers/mailbox/mtk-gpueb-mailbox.c

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