Re: [RESEND PATCH v5 1/1] USB: serial: cp210x: Adding GPIO support for CP2105

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Jul 22, 2016 at 12:33 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>
> Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Still stands.

> V2: - Doesn't break build when gpiolib isn't selected.

Nowadays I have changed the kernel so the driver can actually
select GPIOLIB, any arch supports it now.

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe linux-gpio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html