On Wed, Oct 28, 2020 at 10:10:42PM +0100, Ricardo Ribalda wrote: > Hi Andy > > Thanks for your patch and super fast response. > > I think there are two different concepts here: > > 1) when the pin has a low value, it is 0 or a 1? =>active_low I'm not sure I have got it. GpioIo() has no such property and _DSD active_low is documented as being polarity setting: active_low == 1 => active low polarity. > 2) when do I get an irq, low->high or high->low => irq polarity IRQ polarity is clearly defined by GpioInt() resource in the ACPI specification. > When I read the acpi spec for GpioInt() > https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf page > 934, it has the same problem as for GpioIo(), it does not express the > active_low and this is where the _DSD field comes handy. ActiveLevel field is described in 19.6.55 GpioInt (GPIO Interrupt Connection Resource Descriptor Macro). > Without using the active_low, how can we describe a pin that is > active low and has to trigger an irq on both edges? This is nonsense. What does it mean? -- With Best Regards, Andy Shevchenko
