Re: [PATCH V12 2/2] pinctrl: max77620: add pincontrol driver for MAX77620/MAX20024

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Tue, May 24, 2016 at 1:18 PM, Laxman Dewangan <ldewangan@xxxxxxxxxx> wrote:

> In this driver, it is configuration via pinctrl. Here pincontrol and gpio
> driver share same registers.
> Now, as we have the method to configure the open drain bit from the GPIO
> interface, we really dont need to do this from pinctrl framework.

OK good that works too...

> For doing from GPIO framework, the client need to aware that gpio is open
> drain type.
>
> Can we make something that open drain of pins can be provided via some
> common interface like DT of controller based on platforms configuration  and
> client need not to worry about this? For client, it will be simple gpio
> calls.

We have GPIO_OPEN_DRAIN in
include/dt-bindings/gpio/gpio.h
that can be added on the consumer side of the GPIO line
in the DT, it should work (just like GPIO_ACTIVE_LOW for example).

For descriptor tables
include/linux/gpio/machine.h
provides the same mechanism with the flag GPIO_OPEN_DRAIN

Notice that in both cases it is the consumer that specifies that it
needs the line to be set up as open drain, not the controller,
as it is a resource, the consumer needs to request what it needs.

So this can be done already today. Unless there is some bug.

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



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux