6e24826d2c
This converts the FUSB302 driver to use GPIO descriptors. The conversion to descriptors per se is pretty straight-forward. In the process I discovered that: 1. The driver uses a completely undocumented device tree binding for the interrupt GPIO line, "fcs,int_n". Ooops. 2. The undocumented binding, presumably since it has not seen review, is just "fcs,int_n", lacking the compulsory "-gpios" suffix and also something that is not a good name because the "_n" implies the line is inverted which is something we handle with flags in the device tree. Ooops. 3. Possibly the driver should not be requesting the line as a GPIO and request the corresponding interrupt line by open coding, the GPIO chip is very likely doubleing as an IRQ controller and can probably provide an interrupt directly for this line with interrupts-extended = <&gpio0 ...>; 4. Possibly the IRQ should just be tagged on the I2C client node in the device tree like apparently ACPI does, as it overrides this IRQ with client->irq if that exists. But now it is too late to do much about that and as I can see this is used like this in the Pinebook which is a shipping product so let'a just contain the mess and move on. The property currently appears in: arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts Create a quirk in the GPIO OF library to allow this property specifically to be specified without the "-gpios" suffix, we have other such bindings already. Cc: Tobias Schramm <t.schramm@manjaro.org> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com> Cc: Yueyao Zhu <yueyao@google.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: devicetree@vger.kernel.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20200415192448.305257-1-linus.walleij@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.