Re: [PATCH v14 00/10] iio: adc: introduce Qualcomm SPMI Round Robin ADC
From: Caleb Connolly
Date: Sat Jun 18 2022 - 12:12:20 EST
On 18/06/2022 14:17, Jonathan Cameron wrote:
On Sat, 18 Jun 2022 14:09:13 +0100
Jonathan Cameron <jic23@xxxxxxxxxx> wrote:
On Fri, 29 Apr 2022 23:08:55 +0100
Caleb Connolly <caleb.connolly@xxxxxxxxxx> 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 :)
Gah. Merge into IIO doesn't build because of dropping of.h from includes
in iio.h. This driver should directly include property.h directly.
New 'immutable' branch with same name pushed out. Guessing no one picked
it up in the minute or so previous version was available for!
I'd advise that Lee / Stephen don't merge this for a few days at least so
any other issues have become visible and I can fix them up without making
for complex history.
Hi Jonathan,
Thanks so much for picking this up and fixing those last few issues. And
thanks for all your help with this series, I really appreciate the time
you've taken to help me get this to a mergeable state and teach me about
IIO.
You've really made my week with this :)
Kind Regards,
Caleb
Thanks,
Jonathan
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