On Mon, May 12, 2014 at 04:06:16PM -0400, Alan Stern wrote:
> On Mon, 12 May 2014, Maxime Ripard wrote:
>
> > From: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> >
> > On the Allwinner's A31 SoC the reset line connected to the EHCI IP has to
> > be deasserted for the EHCI block to be usable.
> >
> > Add support for an optional reset controller that will be deasserted on
> > power off and asserted on power on.
> >
> > Signed-off-by: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
>
> ...
>
> > @@ -208,6 +210,18 @@ static int ehci_platform_probe(struct platform_device *dev)
> > }
> > }
> >
> > + priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
> > + if (IS_ERR(priv->rst)) {
> > + err = PTR_ERR(priv->rst);
> > + if (err == -EPROBE_DEFER)
> > + goto err_put_clks;
> > + priv->rst = NULL;
> > + } else {
> > + err = reset_control_deassert(priv->rst);
> > + if (err)
> > + goto err_put_clks;
> > + }
> > +
> > if (pdata->big_endian_desc)
> > ehci->big_endian_desc = 1;
> > if (pdata->big_endian_mmio)
>
> You don't re-assert the reset control if an error happens later on
> during probe. Was that intentional?
No, it wasn't. I'll resubmit another version.
Thanks,
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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