linux-kernel - [PATCH v2 0/2] Allow getting regulator on MFG for multiple SoCs

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Date:   Thu, 23 Jun 2022 14:38:48 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     robh+dt@...nel.org
Cc:     krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wenst@...omium.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH v2 0/2] Allow getting regulator on MFG for multiple SoCs

This is one of the steps to enable DVFS with the Panfrost driver:
since Panfrost is already enabling the (required) MFG power domains
and since the mtk-pm-domains driver is already responsible for
actually enabling the SRAM PDN, it makes sense to make sure that
the VSRAM supply is ON when trying to reset/enable the SRAM.

For this reason, the MTK_SCPD_DOMAIN_SUPPLY flag was added to one
more MFG domain, ensuring that the SRAM is actually powered and
also not relying on the bootloader leaving this supply on; on the
other hand, this is also making possible to avoid setting a
sram-supply on the GPU node, making devfreq happy about having
only one supply and finally allowing DVFS to happen.

If no domain-supply is declared in devicetree, mtk-pm-domains driver
probe will anyway keep going, so this is not breaking old devicetrees.

No side effects either when this supply is declared for both a MFG
domain and Panfrost together.

This series has no dependencies.

 Changes in v2:
  - Squashed all mtXXXX-pm-domains.h changes in one patch

AngeloGioacchino Del Regno (2):
  soc: mediatek: mtk-pm-domains: Allow probing vreg supply on two MFGs
  arm64: dts: mediatek: mt8183-kukui: Assign sram supply to mfg_async pd

 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 4 ++++
 arch/arm64/boot/dts/mediatek/mt8183.dtsi       | 2 +-
 drivers/soc/mediatek/mt8183-pm-domains.h       | 1 +
 drivers/soc/mediatek/mt8186-pm-domains.h       | 2 +-
 drivers/soc/mediatek/mt8192-pm-domains.h       | 2 ++
 drivers/soc/mediatek/mt8195-pm-domains.h       | 2 +-
 6 files changed, 10 insertions(+), 3 deletions(-)

-- 
2.35.1