Subject: Re: [2/2] tty/hvc: Use opal irqchip interface if available

From: Michael Ellerman <[email-masked]>
Date: Tue, 5 Jul 2016 15:31:42 +1000 (AEST)

On Tue, 2016-28-06 at 03:11:39 UTC, Sam Mendoza-Jonas wrote:
> diff --git a/drivers/tty/hvc/hvc_opal.c b/drivers/tty/hvc/hvc_opal.c
> index b7cd0ae..8c53f5b 100644
> --- a/drivers/tty/hvc/hvc_opal.c
> +++ b/drivers/tty/hvc/hvc_opal.c
> @@ -214,7 +216,15 @@ static int hvc_opal_probe(struct platform_device *dev)
>  		dev->dev.of_node->full_name,
>  		boot ? " (boot console)" : "");
>  
> -	irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
> +	rc = of_property_read_u32(dev->dev.of_node, "interrupts", &prop);
> +	if (rc) {
> +		pr_info("hvc%d: No interrupts property, using OPAL event\n",
> +				termno);
> +		irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
> +	} else {
> +		irq = irq_of_parse_and_map(dev->dev.of_node, 0);
> +	}

That seems a bit backward.

Shouldn't we try irq_of_parse_and_map() and if that fails, then we go back to
opal_event_request() ?

cheers