linux-kernel - [PATCH net-next v3 0/3] net: dsa: realtek: support reset controller and update docs

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Date: Tue, 13 Feb 2024 21:54:14 -0300
From: Luiz Angelo Daros de Luca <luizluca@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Alvin Šipraga <alsi@...g-olufsen.dk>, 
 Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, 
 Vladimir Oltean <olteanv@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Luiz Angelo Daros de Luca <luizluca@...il.com>, 
 Arınç ÜNAL <arinc.unal@...nc9.com>, 
 Rob Herring <robh@...nel.org>
Subject: [PATCH net-next v3 0/3] net: dsa: realtek: support reset
 controller and update docs

The driver previously supported reset pins using GPIO, but it lacked
support for reset controllers. Although a reset method is generally not
required, the driver fails to detect the switch if the reset was kept
asserted by a previous driver.

This series adds support to reset a Realtek switch using a reset
controller. It also updates the binding documentation to remove the
requirement of a reset method and to add the new reset controller
property.

It was tested on a TL-WR1043ND v1 router (rtl8366rb via SMI).

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
---

Changes in v3:
- Rebased on the Realtek DSA driver refactoring (08f627164126)
- Dropped the reset controller example in bindings
- Used %pe in error printing
- Linked to v2: https://lore.kernel.org/r/20231027190910.27044-1-luizluca@gmail.com/

Changes in v2:
- Introduced a dedicated commit for removing the reset-gpios requirement
- Placed binding patches before code changes
- Removed the 'reset-names' property
- Moved the example from the commit message to realtek.yaml
- Split the reset function into _assert/_deassert variants
- Modified reset functions to return a warning instead of a value
- Utilized devm_reset_control_get_optional to prevent failure when the
  reset control is missing
- Used 'true' and 'false' for boolean values
- Removed the CONFIG_RESET_CONTROLLER check as stub methods are
  sufficient when undefined
- Linked to v1: https://lore.kernel.org/r/20231024205805.19314-1-luizluca@gmail.com/

---
Luiz Angelo Daros de Luca (3):
      dt-bindings: net: dsa: realtek: reset-gpios is not required
      dt-bindings: net: dsa: realtek: add reset controller
      net: dsa: realtek: support reset controller

 .../devicetree/bindings/net/dsa/realtek.yaml       |  4 +-
 drivers/net/dsa/realtek/realtek.h                  |  2 +
 drivers/net/dsa/realtek/rtl83xx.c                  | 52 +++++++++++++++++++---
 drivers/net/dsa/realtek/rtl83xx.h                  |  2 +
 4 files changed, 54 insertions(+), 6 deletions(-)
---
base-commit: 0f37666d87d2dea42ec21776c3d562b7cbd71612
change-id: 20240212-realtek-reset-88a0bf25bb22

Best regards,
-- 
Luiz Angelo Daros de Luca <luizluca@...il.com>