linux-kernel - Re: [PATCH v4 00/11] Add support for Kontron sl28cpld

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Message-ID: <20200605061350.GC3714@dell>
Date:   Fri, 5 Jun 2020 07:13:50 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Michael Walle <michael@...le.cc>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>, Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v4 00/11] Add support for Kontron sl28cpld

On Thu, 04 Jun 2020, Michael Walle wrote:

> The Kontron sl28cpld is a board management chip providing gpio, pwm, fan
> monitoring and an interrupt controller. For now this controller is used on
> the Kontron SMARC-sAL28 board. But because of its flexible nature, it
> might also be used on other boards in the future. The individual blocks
> (like gpio, pwm, etc) are kept intentionally small. The MFD core driver
> then instantiates different (or multiple of the same) blocks. It also
> provides the register layout so it might be updated in the future without a
> device tree change; and support other boards with a different layout or
> functionalities.
> 
> See also [1] for more information.
> 
> This is my first take of a MFD driver. I don't know whether the subsystem
> maintainers should only be CCed on the patches which affect the subsystem
> or on all patches for this series. I've chosen the latter so you can get a
> more complete picture.

You chose wisely. :)

> [1] https://lore.kernel.org/linux-devicetree/0e3e8204ab992d75aa07fc36af7e4ab2@walle.cc/
> 
> Changes since v3:
>  - use of_platform_populate() to populate internal devices using the
>    internal register offsets as unit-addresses
>  - because we don't use mfd_cells anymore, we cannot use IORESOURCE_REG,
>    but instead parse the reg property in each individual driver
>  - dropped the following patches because they were already merged:
>      gpiolib: Introduce gpiochip_irqchip_add_domain()
>      gpio: add a reusable generic gpio_chip using regmap
>  - dropped the following patches because they are no longer needed:
>      include/linux/ioport.h: add helper to define REG resource constructs
>      mfd: mfd-core: Don't overwrite the dma_mask of the child device
>      mfd: mfd-core: match device tree node against reg property
>  - rephrase commit messages, as suggested by Thomas Gleixner

It's great to have this changelog overview.

However it's equally, if not arguably more important to have a more
fine grained changelog in each of the patches, usually placed between
the '---' and the diff stat.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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