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

[Matti Vaittinen]

On 04/04/2025 18:43, Lee Jones wrote:
> 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/

> The MFD stuff looks okay to me now.
>
> Let me know when everything else is ready to go.

I'll treat this as an ACK for the V3. Please, let me know if that's not 
Okay.

Yours,
	-- Matti