[RFC PATCH 00/13] Support ROHM BD71828 PMIC

From: Matti Vaittinen
Date: Thu Oct 17 2019 - 05:40:46 EST

Patch series introducing support for ROHM BD71828 PMIC

ROHM BD71828 is a power management IC containing 7 bucks and 7 LDOs. All
regulators can either be controlled individually via I2C. Bucks 1,2,6 and
7 can also be assigned to a "regulator group" controlled by run-levels.
Eg. Run level specific voltages and enable/disable statuses for each of
these bucks can be set via register interface. The buck run-level group
assignment (selection if buck is to be controlled individually or via
run-levels) can be changed at run-time via I2C.

Run level changes can then be initiated wither via I2C writes or GPIO.
and when run-level is changed, state of all bucks which are set to be
controlled via run-levels are changed accrdingly.

This control mechanism selection (I2C or GPIO) is selected by data in
one time programmable PMIC memory area (during production) and can't be
changed later.

In addition to the bucks and LDOs there are:

- The usual clk gate
- 4 IO pins (mostly usable as GPO or tied to specific purpose)
- power button support
- two LEDs
- battery charger
- HALL sensor input

This patch series adds support to regulators, clk, RTC, GPIOs and LEDs.
Power-supply driver for charger is "under construction" and not included
in this RFC series.

Reason for RFC status is the regulator grouping to run-levels. I don't
know what would be the best way to do what patches 6,7 and 8 intend to
provide. (Sure some of this is visible also patches 11 and 12 which
provide dt binding documents.) All suggestions are welcome. Rest of the
patches should be business as usual.

Patch 1:
BD71828 MFD core.
Patch 2:
Power button support using GPIO keys.
Patch 3:
CLK gate support using existing clk-bd718x7
Patch 4:
Split existing bd718x7 regulator driver to generic ROHM dt
parsing portion (used by more than one ROHM drivers) and
bd718x8 specific parts
Patch 5:
Basic regulator support (individual control via I2C). This
should be pretty standard stuff.
Patch 6:
Add support for getting regulator voltages when GPIO controlled
run-levels are used. Allow specifying voltages for run-levels
via DT. Allow controlling run-levels via sysfs entries (I am not
happy about this. Probably should only provide in-kernel API for
this or is there better ideas? Showing can be done vis sysfs?
Patch 7:
Support setting/getting run-levels when they are controlled via
I2C instead of GPIO. Add in-kernel API for settin run-level
voltages for regulators at run-time.
Patch 8:
Add in-kernel APIs for changing the RUN-level. Safer than sysfs
I guess. But is there some better method for controlling this
kind of dynamic group of regulators?
Patch 9:
Support BD71828 RTC block using BD70528 RTC driver
Patch 10:
Allow control of GP(I)O pins on BD71828 via GPIO subsystem
Patch 11:
Support toggling the LEDs
Patch 12:
dt-bindings for BD71828 PMIC
Patch 13:
dt-bindings for regulators on BD71828 PMIC

This patch series is based on v5.3-rc4


Matti Vaittinen (13):
mfd: bd71828: Support ROHM BD71828 PMIC - core
mfd: input: bd71828: Add power-key support
clk: bd718x7: Support ROHM BD71828 clk block
regulator: bd718x7: Split driver to common and bd718x7 specific parts
regulator: bd71828: Basic support for ROHM bd71828 PMIC regulators
regulator: bd71828: Add GPIO based run-level control for regulators
regulator: bd71828: enhanced run-level support
regulator: bd71828: Support in-kernel APIs to change run-level
mfd: rtc: support RTC on ROHM BD71828 with BD70528 driver
gpio: bd71828: Initial support for ROHM BD71828 PMIC GPIOs
led: bd71828: Support LED outputs on ROHM BD71828 PMIC
dt-bindings: mfd: Document ROHM BD71282 bindings
dt-bindings: regulator: Document ROHM BD71282 regulator bindings

.../bindings/mfd/rohm,bd71828-pmic.txt | 180 ++
.../regulator/rohm,bd71828-regulator.txt | 164 ++
drivers/clk/Kconfig | 6 +-
drivers/clk/clk-bd718x7.c | 15 +-
drivers/gpio/Kconfig | 12 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-bd71828.c | 161 ++
drivers/leds/Kconfig | 10 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-bd71828.c | 97 ++
drivers/mfd/Kconfig | 15 +
drivers/mfd/Makefile | 2 +-
drivers/mfd/rohm-bd71828.c | 350 ++++
drivers/regulator/Kconfig | 16 +
drivers/regulator/Makefile | 2 +
drivers/regulator/bd71828-regulator.c | 1442 +++++++++++++++++
drivers/regulator/bd718x7-regulator.c | 183 +--
drivers/regulator/rohm-regulator.c | 95 ++
drivers/rtc/Kconfig | 5 +-
drivers/rtc/rtc-bd70528.c | 369 +++--
include/linux/mfd/rohm-bd70528.h | 12 +-
include/linux/mfd/rohm-bd71828.h | 432 +++++
include/linux/mfd/rohm-generic.h | 45 +
include/linux/mfd/rohm-shared.h | 22 +
24 files changed, 3388 insertions(+), 249 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.txt
create mode 100644 Documentation/devicetree/bindings/regulator/rohm,bd71828-regulator.txt
create mode 100644 drivers/gpio/gpio-bd71828.c
create mode 100644 drivers/leds/leds-bd71828.c
create mode 100644 drivers/mfd/rohm-bd71828.c
create mode 100644 drivers/regulator/bd71828-regulator.c
create mode 100644 drivers/regulator/rohm-regulator.c
create mode 100644 include/linux/mfd/rohm-bd71828.h
create mode 100644 include/linux/mfd/rohm-shared.h


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

~~~ "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 =]