linux-kernel - Re: [PATCH 5/9] usb: xhci-pci: Add support for reset controllers

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Date:   Tue, 09 Jun 2020 13:59:59 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        gregkh@...uxfoundation.org, wahrenst@....net, robh@...nel.org,
        mathias.nyman@...ux.intel.com, Eric Anholt <eric@...olt.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-usb@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     lorenzo.pieralisi@....com, tim.gover@...pberrypi.org,
        helgaas@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] usb: xhci-pci: Add support for reset controllers

Hi Nicolas,

On Tue, 2020-06-09 at 13:18 +0200, Nicolas Saenz Julienne wrote:
> Hi Florian, thanks for the reviews!
> 
> On Mon, 2020-06-08 at 12:43 -0700, Florian Fainelli wrote:
> > On 6/8/2020 12:26 PM, Nicolas Saenz Julienne wrote:
> > > Some atypical users of xhci-pci might need to manually reset their xHCI
> > > controller before starting the HCD setup. Check if a reset controller
> > > device is available to the PCI bus and trigger a reset.
> > > 
> > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > > ---
> > >  drivers/usb/host/xhci-pci.c | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > > 
> > > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > > index ef513c2fb843..45f70facdfcd 100644
> > > --- a/drivers/usb/host/xhci-pci.c
> > > +++ b/drivers/usb/host/xhci-pci.c
[...]
> > > @@ -347,6 +349,13 @@ static int xhci_pci_probe(struct pci_dev *dev, const
> > > struct pci_device_id *id)
> > >  			return retval;
> > >  	}
> > >  
> > > +	reset = devm_reset_control_get(&dev->bus->dev, NULL);
> > 
> > Should not this be devm_reset_control_get_optional()?
> 
> Yes, you're right.

Please use devm_reset_control_get_optional_exclusive() while you're at
it.

regards
Philipp