usb: uhci: Add clk support to uhci-platform

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Fri, 2018-01-12 at 10:35 +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 1/12/2018 8:51 AM, Benjamin Herrenschmidt wrote:
> 
> > The Aspeed SoCs use uhci-platform. With the new dynamic clock
> > control framework, the corresponding IP block clock must be
> > properly enabled.
> > 
> > This is a simplified variant of what ehci-platform does, it
> > looks for *one* clock attached to the device, and if it's
> > there, enables it.
> > 
> > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> 
> [...]
> > diff --git a/drivers/usb/host/uhci-platform.c b/drivers/usb/host/uhci-platform.c
> > index 6cb16d4b2257..7d959071f92b 100644
> > --- a/drivers/usb/host/uhci-platform.c
> > +++ b/drivers/usb/host/uhci-platform.c
> > @@ -119,6 +119,21 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
> >   				 "Enabled Aspeed implementation workarounds\n");
> >   		}
> >   	}
> > +
> > +	/* Get and enable clock if any specified */
> > +	uhci->clk = devm_clk_get(&pdev->dev, NULL);
> > +        if (IS_ERR(uhci->clk)) {
> > +                ret = PTR_ERR(uhci->clk);
> > +                goto err_rmr;
> > +        }
> 
>     Indent with tabs as elsewhere, please.

Oops, there should have been, I suppose a copy/paste brought spaces
from the original file ;-) I'll fix that.

> > +	if (uhci->clk) {
> > +		ret = clk_prepare_enable(uhci->clk);
> > +		if (ret) {
> > +			dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
> > +			goto err_rmr;
> > +		}
> > +        }
> > +
> >   	ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
> >   	if (ret)
> >   		goto err_rmr;
> > 
> 
> [...]
> 
> MBR, Segei
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