Re: [PATCH v2 00/14] Support ROHM Scalable PMIC family

[Lee Jones]

On Mon, 24 Mar 2025, Matti Vaittinen wrote:

> Support ROHM BD96802, BD96805 and BD96806 PMICs
> 
> The ROHM BD96801 [1] and BD96805 [2] are almost identical PMICs what comes
> to the digital interface. Main difference is voltage tuning range.
> Supporting BD96805 with BD96801 drivers is mostly just a matter of being
> able to differentiate the PMICs (done based on the devicetree
> compatible) and then providing separate voltage tables.
> 
> The ROHM BD96802 [3] is a companion PMIC which is intended to be used to
> provide more capacity on systems where the BD96801 alone is not
> sufficient. Startup sequence of these PMICs can be synchronized in
> hardware level, and there seems to be some mechanisms which allow
> delivering the companion PMIC (BD96802) status to the main PMIC
> (BD96801/BD96805). This patch series does treat the companion PMIC(s) as
> individual PMICs and allows using them from software point of view as a
> stand alone ICs. From the digital point of view, the BD96802 is a subset
> of BD96801, providing only buck1 and buck2 regulators. Please see the
> data sheet
> 
> The ROHM BD96806 [4] is similar to the BD96802, except that it does also
> provide different voltage tuning ranges.
> 
> This series adds basic voltage monitoring and control as well as a
> watchdog support for these PMICs using the BD96801 drivers.
> 
> Similarly to the BD96801, these PMICs too have a few configurations
> which can only be done when the PMIC is in STBY state. Similarly to the
> BD96801, doing these configurations isn't supported by the driver. The
> original BD96801 RFC [5] driver should be able to cover those
> configurations, if modified to support these models.
> 
> [1]: ROHM BD96801 data sheet:
> https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/product_brief_bd96801qxx-c-e.pdf
> [2]: ROHM BD96805 data sheet:
> https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/product_brief_bd96805qxx-c-e.pdf
> [3]: ROHM BD96802 data sheet:
> https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/product_brief_bd96802qxx-c-e.pdf
> [4]: ROHM BD96806 data sheet:
> https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/product_brief_bd96806qxx-c-e.pdf
> [5]: Original BD96801 RFC:
> https://lore.kernel.org/all/cover.1712058690.git.mazziesaccount@xxxxxxxxx/
> 
> Revision history:
> 
> v1 => v2: MFD driver changes after review by Lee
>  - Use enum for chip type instead of picking the data directly from the
>    of_match_data.
>  - rename "chip data" variable 'cd' to more widely used 'ddata'.
>  link to v1:
>   https://lore.kernel.org/all/cover.1741864404.git.mazziesaccount@xxxxxxxxx/
> 
> ---
> 
> Matti Vaittinen (14):
>   dt-bindings: regulator: Add ROHM BD96802 PMIC
>   dt-bindings: mfd: Add ROHM BD96802 PMIC
>   dt-bindings: mfd: bd96801: Add ROHM BD96805
>   dt-bindings: mfd: bd96802: Add ROHM BD96806
>   mfd: rohm-bd96801: Add chip info
>   mfd: bd96801: Drop IC name from the regulator IRQ resources
>   regulator: bd96801: Drop IC name from the IRQ resources
>   mfd: rohm-bd96801: Support ROHM BD96802
>   regulator: bd96801: Support ROHM BD96802
>   mfd: bd96801: Support ROHM BD96805
>   regulator: bd96801: Support ROHM BD96805 PMIC
>   mfd: bd96801: Support ROHM BD96806
>   regulator: bd96801: Support ROHM BD96806 PMIC
>   MAINTAINERS: Add BD96802 specific header

Adding support for 3 new devices in one set!

You don't like making things easy for yourself (or us) do you!  =:-)

>  .../bindings/mfd/rohm,bd96801-pmic.yaml       |  10 +-
>  .../bindings/mfd/rohm,bd96802-pmic.yaml       | 101 ++++
>  .../regulator/rohm,bd96802-regulator.yaml     |  44 ++
>  MAINTAINERS                                   |   1 +
>  drivers/mfd/rohm-bd96801.c                    | 565 ++++++++++++++----
>  drivers/regulator/bd96801-regulator.c         | 447 ++++++++++++--
>  include/linux/mfd/rohm-bd96801.h              |   2 +
>  include/linux/mfd/rohm-bd96802.h              |  74 +++
>  include/linux/mfd/rohm-generic.h              |   3 +
>  9 files changed, 1065 insertions(+), 182 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd96802-pmic.yaml
>  create mode 100644 Documentation/devicetree/bindings/regulator/rohm,bd96802-regulator.yaml
>  create mode 100644 include/linux/mfd/rohm-bd96802.h

The MFD stuff looks okay to me now.

Let me know when everything else is ready to go.

-- 
Lee Jones [李琼斯]