linux-kernel - [PATCH RFC 0/2] hwmon: Add RPi PoE HAT fan driver

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Message-Id: <1535887251-29515-1-git-send-email-stefan.wahren@i2se.com>
Date:   Sun,  2 Sep 2018 13:20:49 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Phil Elwell <phil@...pberrypi.org>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: [PATCH RFC 0/2] hwmon: Add RPi PoE HAT fan driver

This series is an early stage of the hwmon driver for the fan on the
Raspberry Pi Power over Ethernet HAT [1]. At the end this should use a
Device Tree Overlay.

Changes by Stefan based on [2]:
- reformat the downstream patches for submission
- drop reboot notification
- fix remaining checkpatch issues
- add COMPILE_TEST to Kconfig

The driver is mostly copy & paste from pwm-fan, which isn't good. Personally
i see two options:

1) integrate the driver function into the pwm-fan driver (new compatible)
2) implement the core function as a PWM driver and use the pwm-fan driver on top

[1] - https://www.raspberrypi.org/products/poe-hat/
[2] - https://github.com/raspberrypi/linux/commit/0f937c8dc3201ebffa6c617c616fd7c65db65959

Serge Schneider (2):
  dt-bindings: hwmon: Add RPi PoE HAT documentation
  hwmon: Add RPi PoE HAT fan driver

 .../devicetree/bindings/hwmon/rpi-poe-fan.txt      |  55 +++
 Documentation/hwmon/rpi-poe-fan                    |  15 +
 drivers/hwmon/Kconfig                              |  11 +
 drivers/hwmon/Makefile                             |   1 +
 drivers/hwmon/rpi-poe-fan.c                        | 414 +++++++++++++++++++++
 include/soc/bcm2835/raspberrypi-firmware.h         |   2 +
 6 files changed, 498 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
 create mode 100644 Documentation/hwmon/rpi-poe-fan
 create mode 100644 drivers/hwmon/rpi-poe-fan.c

-- 
2.7.4