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

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Date:   Sun, 2 Sep 2018 07:23:41 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        Jean Delvare <jdelvare@...e.com>,
        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
Subject: Re: [PATCH RFC 0/2] hwmon: Add RPi PoE HAT fan driver

On 09/02/2018 04:20 AM, Stefan Wahren wrote:
> 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
> 

I don't really see the point of thise driver. Why not implement either of those ?
2) sounds like a perfect fit to me.

Guenter

> [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
>