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

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Date:   Mon, 8 Mar 2021 22:30:11 +0800
From:   Mark-PK Tsai <mark-pk.tsai@...iatek.com>
To:     <daniel@...f.com>, Mark-PK Tsai <mark-pk.tsai@...iatek.com>
CC:     <daniel@...ngy.jp>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <matthias.bgg@...il.com>,
        <maz@...nel.org>, <tglx@...utronix.de>, <yj.chiang@...iatek.com>
Subject: Re: [PATCH v2] irqchip/irq-mst: Support polarity configuration

From: Daniel Palmer <daniel@...f.com>


>On Mon, 8 Mar 2021 at 15:05, Mark-PK Tsai <mark-pk.tsai@...iatek.com> 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.