Date:   Sat, 18 Jun 2022 14:09:13 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH v14 00/10] iio: adc: introduce Qualcomm SPMI Round Robin
 ADC

On Fri, 29 Apr 2022 23:08:55 +0100
Caleb Connolly <caleb.connolly@...aro.org> wrote:

> The RRADC is responsible for reading data about the current and
> voltage from the USB or DC in jacks, it can also read the battery
> ID (resistence) and some temperatures. It is found on the PMI8998 and
> PM660 Qualcomm PMICs.
> 
> The RRADC has to calibrate some ADC values based on which chip fab
> the PMIC was produced in, to facilitate this the patches
> ("mfd: qcom-spmi-pmic: expose the PMIC revid information to clients")
> and ("mfd: qcom-spmi-pmic: read fab id on supported PMICs")
> expose the PMIC revision information and fab_id as a struct and register
> them as driver data in the Qualcomm SPMI PMIC driver so that it can be
> read by the RRADC.
> 
> The first 3 patches add support for looking up an SPMI device from a
> struct device_node, as well as introducing support for looking up the
> base USID of a Qcom PMIC, see patch comments for more details. These
> Address Bjorns comments on v2.

Hi Caleb / All

Rather than waste time going for a v15 for the 3 minor issues in reviews
I've just fixed them up whilst applying.

As spmi or mfd maintainers may want an immutable branch I've
just pushed one out at
https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git immutable-qcom-spmi-rradc
that has the first 5 patches. I assume the dts changes will go via qcom -> arm-soc
as normal.

0-day should run on that branch shortly but I'll be optimistic and pull it
into my testing branch in the meantime (mostly so I don't forget about it and
can mark it applied in patchwork :)

Thanks,

Jonathan


> 
> Changes since v13:
>  * Address Lee Jones' feedback on the SPMI patches.
>  * Pick up Jami's patch to enable the RRADC on the OnePlus 5
> 
> Changes since v12:
>  * Apply Krzysztof's suggestions to rradc DT binding docs.
> 
> Changes since v11:
>  * Remove debug logging which was left in ("mfd: qcom-spmi-pmic: expose the PMIC revid information to clients")
>  * Picked up Dmitry's Tested-by and Reviewed-by tags.
> 
> Changes since v10:
>  * Don't inline spmi_device_from_of()
> 
> Changes since v9:
>  * Add back missing copyright, this driver is originally derived from
>    downstream (Thanks Manivannan).
> 
> Changes since v8:
>  * Drop Reported-by for the bugfix on previous revision reported by LKP
>  * Apply Jonathans suggestions
>  * Rework patch 2 ("expose the PMIC revid information to clients") to
>    handle PMICs with a single USID (thanks Dmitry)
> 
> Changes since v7:
>  * Addressed Jonathans comments
>  * Fixed bug reported by LKP
> 
> Changes since v6:
>  * Fix printf format warning in rradc
> 
> Changes since v5:
>  * Add missing EXPORT_SYMBOL_GPL() to
>    ("spmi: add a helper to look up an SPMI device from a device node")
> 
> Changes since v4:
>  * Addressed Jonathan's comments on v4
>  * Reworked the qcom-spmi-pmic patches to properly walk the devicetree
>    to find the base USID. I've tested this on SDM845 which has two PMICs
>    (pm8998 and pmi8998) and I'm able to look up the PMIC revid from all
>    4 USIDs.
> 
> Changes since v3:
>  * Split PMIC patch in two, rework to support function drivers on a
>    sibling USID
>  * Completely rework RRADC driver to make use of the modern IIO
>    framework. This required re-arranging a lot of the equations and
>    results in some lost precision, where relevant I've left comments to
>    explain this. I don't think any of it is significant enough to
>    justify doing post-processing in driver.
>    Thanks a lot Jonathan and John Stultz for helping me out with
>    this
> 
> Changes since v2:
>  * Add missing include (thanks kernel test robot :D)
>  * Rework some confusing function return values, specifically
>    rradc_read_status_in_cont_mode and rradc_prepare_batt_id_conversion
>    both of which didn't correctly handle "ret". This also bought up an
>    issue as the previous implementation didn't actually wait for the
>    channel to be ready. It doesn't seem like that's strictly necessary
>    (same data is reported if I wait for the status to be good or not)
>    but I've included it anyway for good measure.
> 
> Changes since v1:
>  * Rework the RRADC driver based on Jonathan's feedback
>  * Pick up Rob's reviewed by for the dt-binding patch.
>  ---
> Caleb Connolly (9):
>   spmi: add a helper to look up an SPMI device from a device node
>   mfd: qcom-spmi-pmic: expose the PMIC revid information to clients
>   mfd: qcom-spmi-pmic: read fab id on supported PMICs
>   dt-bindings: iio: adc: document qcom-spmi-rradc
>   iio: adc: qcom-spmi-rradc: introduce round robin adc
>   arm64: dts: qcom: pmi8998: add rradc node
>   arm64: dts: qcom: sdm845-oneplus: enable rradc
>   arm64: dts: qcom: sdm845-db845c: enable rradc
>   arm64: dts: qcom: sdm845-xiaomi-beryllium: enable rradc
> 
> Jami Kettunen (1):
>   arm64: dts: qcom: msm8998-oneplus-common: enable RRADC
> 
>  .../bindings/iio/adc/qcom,spmi-rradc.yaml     |   51 +
>  .../boot/dts/qcom/msm8998-oneplus-common.dtsi |    4 +
>  arch/arm64/boot/dts/qcom/pmi8998.dtsi         |    8 +
>  arch/arm64/boot/dts/qcom/sdm845-db845c.dts    |    4 +
>  .../boot/dts/qcom/sdm845-oneplus-common.dtsi  |    4 +
>  .../boot/dts/qcom/sdm845-xiaomi-beryllium.dts |    4 +
>  drivers/iio/adc/Kconfig                       |   12 +
>  drivers/iio/adc/Makefile                      |    1 +
>  drivers/iio/adc/qcom-spmi-rradc.c             | 1021 +++++++++++++++++
>  drivers/mfd/qcom-spmi-pmic.c                  |  272 +++--
>  drivers/spmi/spmi.c                           |   17 +
>  include/linux/spmi.h                          |    3 +
>  include/soc/qcom/qcom-spmi-pmic.h             |   61 +
>  13 files changed, 1372 insertions(+), 90 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/qcom,spmi-rradc.yaml
>  create mode 100644 drivers/iio/adc/qcom-spmi-rradc.c
>  create mode 100644 include/soc/qcom/qcom-spmi-pmic.h
> 

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