linux-kernel - [PATCH v2 0/2] Add SMI clamp in MediaTek SMI driver

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Message-ID: <20241120063701.8194-1-friday.yang@mediatek.com>
Date: Wed, 20 Nov 2024 14:36:37 +0800
From: Friday Yang <friday.yang@...iatek.com>
To: Yong Wu <yong.wu@...iatek.com>, Krzysztof Kozlowski <krzk@...nel.org>, Rob
 Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Matthias
 Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Philipp Zabel
	<p.zabel@...gutronix.de>
CC: <linux-mediatek@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>, Friday Yang
	<friday.yang@...iatek.com>
Subject: [PATCH v2 0/2] Add SMI clamp in MediaTek SMI driver

Based on tag: next-20241119, linux-next/master

Refer to the discussion in the following link:
https://lore.kernel.org/all/CAFGrd9qZhObQXvm2_abqaX83xMLqxjQETB2=wXpobDWU1CnvkA@mail.gmail.com/
https://lore.kernel.org/all/CAPDyKFpokXV2gJDgowbixTvOH_5VL3B5H8eyhP+KJ5Fasm2rFg@mail.gmail.com/
SMI clamp and reset operations should be implemented in SMI driver
instead of PM driver.

When we enable/disable power domain, the SMI LARBs linked to this power
domain could be affected by the bus glitch. To avoid this issue, SMI
need to apply clamp and reset opereations.

This patch mainly add these functions:
1) Register genpd callback for SMI LARBs and handle this power domain
   status change in SMI driver.
2) Add bindings to support SMI Sub Common for MT8188.
3) Add bindings to support SMI larbs reset opearation

Changes v2:
- According to previous discussions in v1, divided these four
  patches into two topic separately
- Modify the description for 'resets' in binding
- Add const value 'larb' for 'reset-names' in binding
- Modify requirement for 'resets' and 'reset-names' in binding
- Delete 'mediatek,smi-sub-comm' in binding
- Delete 'mediatek,smi-sub-comm-in-portid' in binding
- Modify the example in binding
- Add 'mtk_smi_larb_clamp_port_mt8188' definition in SMI driver
- Change the way to parse the 'resets' in driver
- Change label from 'err_pm_disable' to 'err_link_remove'

v1:
https://patchwork.kernel.org/project/linux-mediatek/patch/20240821082845.11792-3-friday.yang@mediatek.com/
https://patchwork.kernel.org/project/linux-mediatek/patch/20240821082845.11792-4-friday.yang@mediatek.com/

friday.yang (2):
  dt-bindings: reset: mediatek: Add mt8188 SMI reset control binding
  reset: mediatek: Add reset control driver for SMI

 .../bindings/reset/mediatek,smi-reset.yaml    |  53 ++++++
 drivers/reset/Kconfig                         |   9 +
 drivers/reset/Makefile                        |   1 +
 drivers/reset/reset-mediatek-smi.c            | 156 ++++++++++++++++++
 include/dt-bindings/reset/mt8188-resets.h     |  11 ++
 5 files changed, 230 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reset/mediatek,smi-reset.yaml
 create mode 100644 drivers/reset/reset-mediatek-smi.c

--
2.46.0