linux-kernel - Re: [PATCH v1] usb: xhci: tegra: Check padctrl interrupt presence in device tree

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Date:   Fri, 22 Oct 2021 00:14:17 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        JC Kuo <jckuo@...dia.com>, Nicolas Chauvet <kwizart@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v1] usb: xhci: tegra: Check padctrl interrupt presence in
 device tree

On Fri, Oct 22, 2021 at 12:46:23AM +0300, Dmitry Osipenko wrote:
> 22.10.2021 00:37, Michał Mirosław пишет:
> > On Thu, Oct 21, 2021 at 02:55:01PM +0300, Dmitry Osipenko wrote:
> >> Older device-trees don't specify padctrl interrupt and xhci-tegra driver
> >> now fails to probe with -EINVAL using those device-trees. Check interrupt
> >> presence and disallow runtime PM suspension if it's missing to fix the
> >> trouble.
> > [...]
> >> --- a/drivers/usb/host/xhci-tegra.c
> >> +++ b/drivers/usb/host/xhci-tegra.c
> >> @@ -1454,10 +1454,13 @@ static int tegra_xusb_probe(struct platform_device *pdev)
> >>  		goto put_padctl;
> >>  	}
> >>  
> >> -	tegra->padctl_irq = of_irq_get(np, 0);
> >> -	if (tegra->padctl_irq <= 0) {
> >> -		err = (tegra->padctl_irq == 0) ? -ENODEV : tegra->padctl_irq;
> >> -		goto put_padctl;
> >> +	/* Older device-trees don't specify padctrl interrupt */
> >> +	if (of_property_read_bool(np, "interrupts")) {
> > 
> > Does this catch "interrupts-extended"?
> 
> No, Tegra doesn't use interrupts-extended.

I believe it is generic and equivalent to "interrupt-parent" +
"interrupts" properties, so people might as well put this in
the DT to save (or loose) a few bytes.

You could just check if of_irq_get() returned -EINVAL instead of
matching "interrupts" property.

Best Regards
Michał Mirosław