Messages in this thread | | | From | Andy Shevchenko <> | Date | Thu, 6 Apr 2017 19:10:38 +0300 | Subject | Re: [PATCH 1/1] gpio: core: Decouple open drain/source flag with active low/high |
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On Thu, Apr 6, 2017 at 4:35 PM, Laxman Dewangan <ldewangan@nvidia.com> wrote: > Currently, the GPIO interface is said to Open Drain if it is Single > Ended and active LOW. Similarly, it is said as Open Source if it is > Single Ended and active HIGH. > > The active HIGH/LOW is used in the interface for setting the pin > state to HIGH or LOW when enabling/disabling the interface. > > In Open Drain interface, pin is set to HIGH by putting pin in > high impedance and LOW by driving to the LOW. > > In Open Source interface, pin is set to HIGH by driving pin to > HIGH and set to LOW by putting pin in high impedance. > > With above, the Open Drain/Source is unrelated to the active LOW/HIGH > in interface. There is interface where the enable/disable of interface > is ether active LOW or HIGH but it is Open Drain type. > > Hence decouple the Open Drain with Single Ended + Active LOW and > Open Source with Single Ended + Active HIGH. > > Adding different flag for the Open Drain/Open Source which is valid > only when Single ended flag is enabled.
> if (single_ended) { > - if (active_low) > + if (open_drain)
This breaks ACPI case, right?
-- With Best Regards, Andy Shevchenko
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