Re: [PATCH v7 1/1] USB: serial: cp210x: Adding GPIO support for CP2105

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Mon, Oct 10, 2016 at 3:39 PM, Martyn Welch
<martyn.welch@xxxxxxxxxxxxxxx> wrote:

> This patch adds support for the GPIO found on the CP2105. Unlike the GPIO
> provided by some of the other devices supported by the cp210x driver, the
> GPIO on the CP2015 is muxed on pins otherwise used for serial control
> lines. The GPIO have been configured in 2 separate banks as the choice to
> configure the pins for GPIO is made separately for pins shared with each
> of the 2 serial ports this device provides, though the choice is made for
> all pins associated with that port in one go. The choice of whether to use
> the pins for GPIO or serial is made by adding configuration to a one-time
> programable PROM in the chip and can not be changed at runtime. The device
> defaults to GPIO.
>
> This device supports either push-pull or open-drain modes, it doesn't
> provide an explicit input mode, though the state of the GPIO can be read
> when used in open-drain mode. Like with pin use, the mode is configured in
> the one-time programable PROM and can't be changed at runtime.
>
> Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxxxx>
(...)
> V7: - Using GPIO private data for GPIO bits.
>     - Adding limited .set_single_ended() and direction support.
>     - Simplifying attach() and removing release() as it's no longer required.

>From a GPIO point of view:
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij
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