linux-kernel - Re: [PATCH 2/2] PCI: imx6: Add code to request/control "pcie

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Date:   Thu, 28 Feb 2019 21:23:58 +0000
From:   Trent Piepho <tpiepho@...inj.com>
To:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     "linux-imx@....com" <linux-imx@....com>,
        "hongxing.zhu@....com" <hongxing.zhu@....com>,
        "cphealy@...il.com" <cphealy@...il.com>,
        "aisheng.dong@....com" <aisheng.dong@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "fabio.estevam@....com" <fabio.estevam@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "leonard.crestez@....com" <leonard.crestez@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 2/2] PCI: imx6: Add code to request/control "pcie_aux"
 clock for i.MX8MQ

On Tue, 2019-02-12 at 10:36 +0100, Lucas Stach wrote:
> Am Montag, den 11.02.2019, 17:51 -0800 schrieb Andrey Smirnov:
> > PCIe IP block has additional clock, "pcie_aux", that needs to be
> > controlled by the driver. Add code to support that.

This breaks iMX7d.

> > 
> > @@ -1049,6 +1059,12 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  			dev_err(dev, "Failed to get PCIE APPS reset control\n");
> >  			return PTR_ERR(imx6_pcie->apps_reset);
> >  		}
> > +
> > +		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
> > +		if (IS_ERR(imx6_pcie->pcie_aux)) {
> > +			dev_err(dev, "pcie_aux clock source missing or invalid\n");
> > +			return PTR_ERR(imx6_pcie->pcie_aux);
> > +		}
> >  		break;
> >  	default:
> >  		break;

One can't see enough context in the patch above, but in linux-next this
section is under

         case IMX7D:
         case IMX8MQ:

It's being applied to imx7d and not just imx8mq and so breaks because
imx7d dts files don't have this clock.  Not sure if this is a bug in
this commit or some kind of merge/rebase mistake.