Re: [PATCH 1/1] gpio: mcp23s08: Add support for level triggered interrupts
From: Linus Walleij
Date: Thu Mar 31 2016 - 04:41:32 EST
On Wed, Mar 23, 2016 at 6:01 PM, Alexander Stein
> The interrupt for the corresponding pin is configured to trigger when the
> pin state changes compared to a preconfigured state (Bit set in INTCON).
> This state is set by setting/clearing the bit in DEFVAL.
> In the interrupt handler we need also to check if the bit in INTCON is set
> for level triggered interrupts.
> Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxxxxxxxx>
I'm a bit concerned that you now support both edge and level trigged
IRQs but this driver is using handle_simple_irq() in the
gpiochip_irqchip_add() call. I guess it "just works" because
the hardware will latch the edge IRQ and clear it when reading the
I guess you have tested it with both edge and level IRQs?