linux-kernel - [RFC PATCH v2 0/5] Support ROHM BD99954 charger IC

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Date:   Fri, 14 Feb 2020 09:29:05 +0200
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     matti.vaittinen@...rohmeurope.com, mazziesaccount@...il.com
Cc:     mikko.mutanen@...rohmeurope.com, markus.laine@...rohmeurope.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 0/5] Support ROHM BD99954 charger IC

Support ROHM BD99954 Battery Management IC

ROHM BD99954 is a Battery Management IC for 1-4 cell Lithium-Ion
secondary battery. BD99954 is intended to be used in space-constraint
equipment such as Low profile Notebook PC, Tablets and other
applications.

Series introduces "linear ranges" helper intended to help converting
real-world values to register values when conversion is linear. This
version just meld the helpers in power/supply. Idea is stolen from
regulator framework's linear-ranges handling.

This version of series introduces new battry DT binding entries and
adds the parsing in power_supply_get_battery_info(). These properties
can be converted to ROHM specific properties and parsing can be moved
to the BD99954 driver if this does not seem like a right thing to do.
I just have a feeling the the BD99954 is not the only charger which
could utilize these.

We also add ROHM specific charger parameters for limiting the input
current(s). I think these parameters are pretty common and maybe the
"rohm,"-prefix should be dropped and we should try having common
input limiting properties for different chips?

Series is based on v5.5-rc7

Changelog RFC-v2:
 DT-bindings:
   - Used the battery parameters described in battery.txt
   - Added few new parameters to battery.txt
   - Added ASCII art charging profile chart for BD99954 to explain
     states and limits.
 Linear ranges:
   - Fixed division by zero error from linear-ranges code if step 0 is
     used.
 Power-supply core:
   - Added parsing of new battery parameters.
 BD99954 driver:
   - converted to use battery parameters from battery node
   - Added step 0 ranges for reg values which do not change voltage
   - added dt-node to psy-config

Patch 1:
	DT binding docs for the new battery parameters
Patch 2:
	BD99954 charger DT binding docs
Patch 3:
	Linear ranges helpers
Patch 4:
	Parsing of new battery parameters
Patch 5:
	BD99954 driver

---

Matti Vaittinen (5):
  dt-bindings: battry: add new battery parameters
  dt_bindings: ROHM BD99954 Charger
  power: Add linear_range helper
  power: supply: add battery parameters
  power: supply: Support ROHM bd99954 charger

 .../bindings/power/supply/battery.txt         |    6 +
 .../bindings/power/supply/rohm,bd9995x.yaml   |  167 +++
 drivers/power/supply/Kconfig                  |   14 +
 drivers/power/supply/Makefile                 |    2 +
 drivers/power/supply/bd70528-charger.c        |   65 +-
 drivers/power/supply/bd99954-charger.c        | 1140 +++++++++++++++++
 drivers/power/supply/linear-ranges.h          |   36 +
 drivers/power/supply/linear_ranges.c          |   92 ++
 drivers/power/supply/power_supply_core.c      |    8 +
 include/linux/power/bd99954-charger.h         | 1075 ++++++++++++++++
 include/linux/power_supply.h                  |    4 +
 11 files changed, 2552 insertions(+), 57 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/power/supply/rohm,bd9995x.yaml
 create mode 100644 drivers/power/supply/bd99954-charger.c
 create mode 100644 drivers/power/supply/linear-ranges.h
 create mode 100644 drivers/power/supply/linear_ranges.c
 create mode 100644 include/linux/power/bd99954-charger.h

-- 
2.21.0

-- 
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 =]