linux-kernel - [PATCH v2 0/4] Add support for QCOM SPMI Flash LEDs

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Date:   Tue, 26 Jan 2021 14:03:33 +0000
From:   Nícolas F. R. A. Prado 
        <nfraprado@...tonmail.com>
To:     Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-leds@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Brian Masney <masneyb@...tation.org>,
        Luca Weiss <luca@...tu.xyz>,
        Russell King <linux@...linux.org.uk>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        lkcamp@...ts.libreplanetbr.org, andrealmeid@...labora.com
Subject: [PATCH v2 0/4] Add support for QCOM SPMI Flash LEDs

Hi,

this patch series adds support for Qualcomm's SPMI Flash LEDs present in the
PM8941 PMIC. It is used as part of MSM8974 based devices, like the Nexus 5
(hammerhead), as a camera flash or as a lantern when in torch mode.

Patch 1 adds the dt-bindings for the driver, together with a header for the
values of some properties.

Patch 2 adds the driver, which was ported from downstream [1], and is now using
the flash LED class framework.

Patch 3 enables the driver as a module in qcom_defconfig, and also enables
CONFIG_LEDS_CLASS_FLASH since it is required by the driver.

Patch 4 adds the device tree nodes configuring the driver in the pm8941 dtsi.

After the feedback I received from the v1 RFC patch (thank you Jacek and
Bjorn!), I implemented the flash LED class framework, renamed the driver to
qcom-spmi-flash and added the dt-bindings. I also did a whole lot of cleanup.

Some caveats:
- I still didn't implement get_strobe() and get_fault() for the flash LEDs,
  because I'm still not sure how to do it. get_strobe() in particular I'm not
  even sure if is possible, since after the flash turns off automatically after
  the timeout, I don't see any change in the SPMI registers. So I'm unsure how
  one would get the current strobe state.
- I have yet to add the V4L2 flash wrapper for the flash LEDs. I still didn't do
  it because I wasn't sure if it was needed, so wanted to double check. But
  being a camera flash it seems that would be useful. Also, it would be great if
  someone could point me how I would go about testing the flash usage through
  V4L2.

Another thing worth mentioning: for v1 the dt nodes were added in hammerhead's
dts (just to simplify testing), but I have now moved them to pm8941's dtsi,
since it was like that in downstream. So if folks using devices based on
PM8941/MSM8974 other than the Nexus 5 could test it, that would be great, since
I have only tested on the Nexus 5.

v1 RFC: https://lore.kernel.org/lkml/20201106165737.1029106-1-nfraprado@protonmail.com/

[1] https://github.com/AICP/kernel_lge_hammerhead/blob/n7.1/drivers/leds/leds-qpnp.c

Nícolas F. R. A. Prado (4):
  dt-bindings: leds: Add binding for qcom-spmi-flash
  leds: Add driver for QCOM SPMI Flash LEDs
  ARM: qcom_defconfig: Enable QCOM SPMI Flash LEDs
  ARM: dts: qcom: pm8941: Add nodes for QCOM SPMI Flash LEDs

 .../bindings/leds/leds-qcom-spmi-flash.yaml   |   94 ++
 arch/arm/boot/dts/qcom-pm8941.dtsi            |   38 +
 arch/arm/configs/qcom_defconfig               |    2 +
 drivers/leds/Kconfig                          |    8 +
 drivers/leds/Makefile                         |    1 +
 drivers/leds/leds-qcom-spmi-flash.c           | 1153 +++++++++++++++++
 .../dt-bindings/leds/leds-qcom-spmi-flash.h   |   15 +
 7 files changed, 1311 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
 create mode 100644 drivers/leds/leds-qcom-spmi-flash.c
 create mode 100644 include/dt-bindings/leds/leds-qcom-spmi-flash.h

-- 
2.30.0