linux-kernel - [RFC PATCH 0/6] Support ROHM BD96801 scalable PMIC

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Date: Tue, 2 Apr 2024 16:07:18 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
	Matti Vaittinen <mazziesaccount@...il.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: [RFC PATCH 0/6] Support ROHM BD96801 scalable PMIC

Support ROHM BD96801 "scalable" PMIC.

The ROHM BD96801 is automotive grade PMIC, intended to be usable in
multiple solutions. The BD96801 can be used as a stand-alone, or together
with separate 'companion PMICs'. This modular approach aims to make this
PMIC suitable for various use-cases.

This RFC series is a product of a _long_ process. The product has been
re-designed a few times and this series has been sitting in my git
forgotten for long periods of time, then been re-worked when new design
has been available, after which it has again been forgotten. Last week I
finally received the word that this product should've been stabilized,
digged up my last set of patches (from Nov 2021 - cover letter
reminding me the driver development had been done during 3 years...)

I think this is valid information for reviewers as it's good to keep an
eye on obsoleted practices - even though I tried updating this series.

This is sent as an RFC because of the regulator features which can be
configured only when the PMIC is in STBY state. This is described more
detailed in the regulator patch.

Another "oddity" is that the PMIC has two physical IRQ lines. When I
last wrote this patch in 2021 I had some naming collison in debugfs for
the IRQ domains. Back then I used:
irq_domain_update_bus_token(intb_domain, DOMAIN_BUS_WIRED);
to work-around the issue. Now, when rebasing to v6.9-rc1 the naming
collision was gone and things seemed to work. However, it'd be great if
the IRQ code in MFD driver was reviewed by greater minds :)

Rest of the series ought to be business as usual.

Matti Vaittinen (6):
  dt-bindings: ROHM BD96801 PMIC regulators
  dt-bindings: mfd: bd96801 PMIC core
  mfd: support ROHM BD96801 PMIC core
  regulator: bd96801: ROHM BD96801 PMIC regulators
  watchdog: ROHM BD96801 PMIC WDG driver
  MAINTAINERS: Add ROHM BD96801 'scalable PMIC' entries

 .../bindings/mfd/rohm,bd96801-pmic.yaml       |  155 ++
 .../regulator/rohm,bd96801-regulator.yaml     |   69 +
 MAINTAINERS                                   |    4 +
 drivers/mfd/Kconfig                           |   13 +
 drivers/mfd/Makefile                          |    1 +
 drivers/mfd/rohm-bd96801.c                    |  454 ++++
 drivers/regulator/Kconfig                     |   12 +
 drivers/regulator/Makefile                    |    2 +
 drivers/regulator/bd96801-regulator.c         | 2109 +++++++++++++++++
 drivers/watchdog/Kconfig                      |   13 +
 drivers/watchdog/Makefile                     |    1 +
 drivers/watchdog/bd96801_wdt.c                |  375 +++
 include/linux/mfd/rohm-bd96801.h              |  212 ++
 include/linux/mfd/rohm-generic.h              |    1 +
 14 files changed, 3421 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd96801-pmic.yaml
 create mode 100644 Documentation/devicetree/bindings/regulator/rohm,bd96801-regulator.yaml
 create mode 100644 drivers/mfd/rohm-bd96801.c
 create mode 100644 drivers/regulator/bd96801-regulator.c
 create mode 100644 drivers/watchdog/bd96801_wdt.c
 create mode 100644 include/linux/mfd/rohm-bd96801.h

base-commit: 4cece764965020c22cff7665b18a012006359095
-- 
2.43.2

-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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