pmdomain: mediatek: Add support for secure modem power domain control

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On recent MediaTek SoCs such as MT6858, the kernel is required to use
a secure monitor call (SMC) to enable or disable the modem power domain.
The power domain control register can be read, but firmware prevents it
from being modified directly. Some other parts of the power sequence,
such as setting the ext_buck_iso register, still need to be performed on
the kernel side.

In preparation for modem support, add a flag to enable this new power
sequence for SoCs that need it. Power domains using this flag are not
expected to configure any bus protection registers, since these are
handled internally by the SMC call.

Signed-off-by: Nikolai Burov <nikolai.burov@jolla.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

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This commit is contained in:

Nikolai Burov 2026-07-20 23:46:47 +03:00 • committed by Ulf Hansson

parent 8eceaa5488

commit 86cb2f65aa

3 changed files with 49 additions and 5 deletions

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50

drivers/pmdomain/mediatek/mtk-pm-domains.c

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drivers/pmdomain/mediatek/mtk-pm-domains.h

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3

include/linux/soc/mediatek/mtk_sip_svc.h

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