Re: [PATCH v2] irqchip/irq-mst: Support polarity configuration

[Mark-PK Tsai]

From: Daniel Palmer <daniel@xxxxxxxx>


>On Mon, 8 Mar 2021 at 15:05, Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx> wrote:
>> +static int mst_irq_chip_set_type(struct irq_data *data, unsigned int type)
>	> +{
>> +       if (type != IRQ_TYPE_LEVEL_LOW && type != IRQ_TYPE_LEVEL_HIGH)
>> +               return -EINVAL;
>> +
>
>Does this mean we can't do rising or falling edge interrupts?

Yes, the interrupt of mst-intc is either level high or level low.
Actually the input signal can be pulse, but it will be converted to level
by the latch in mst-intc.