From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: nikolai.burov@jolla.com, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Ulf Hansson <ulfh@kernel.org>
Cc: Matthias Brugger <mbrugger@suse.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-pm@vger.kernel.org,
Nikolai Burov <nikolai.burov+review@abscue.de>
Subject: Re: [PATCH v3 2/3] pmdomain: mediatek: Add support for secure modem power domain control
Date: Tue, 21 Jul 2026 11:19:47 +0200 [thread overview]
Message-ID: <cc9ffb02-4175-48c2-89d6-b538bf75a350@collabora.com> (raw)
In-Reply-To: <20260720-mt6858-pmdomain-v3-2-8966d8de93c8@jolla.com>
On 7/20/26 22:46, Nikolai Burov via B4 Relay wrote:
> From: Nikolai Burov <nikolai.burov@jolla.com>
>
> 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>
next prev parent reply other threads:[~2026-07-21 9:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-20 20:46 [PATCH v3 0/3] pmdomain: mediatek: Add MT6858 support Nikolai Burov via B4 Relay
2026-07-20 20:46 ` [PATCH v3 1/3] dt-bindings: power: Add MediaTek MT6858 power domain controller Nikolai Burov via B4 Relay
2026-07-20 20:46 ` [PATCH v3 2/3] pmdomain: mediatek: Add support for secure modem power domain control Nikolai Burov via B4 Relay
2026-07-21 9:19 ` AngeloGioacchino Del Regno [this message]
2026-07-21 10:04 ` Matthias Brugger
2026-07-20 20:46 ` [PATCH v3 3/3] pmdomain: mediatek: Add support for MT6858 SoC Nikolai Burov via B4 Relay
2026-07-21 10:04 ` Matthias Brugger
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