[PATCH v10 0/9] iio: adc: introduce Qualcomm SPMI Round Robin ADC

Caleb Connolly
2022-03-05T02:13:04Z

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.

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

.../bindings/iio/adc/qcom,spmi-rradc.yaml | 54 +
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 | 275 +++--
drivers/spmi/spmi.c | 17 +
include/linux/spmi.h | 2 +
include/soc/qcom/qcom-spmi-pmic.h | 61 +
12 files changed, 1373 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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2.35.1