[PATCH v3 5/8] usb: ehci-platform: add optional reset controller retrieval

[Alan Stern]

On Mon, 12 May 2014, Maxime Ripard wrote:

> From: Boris BREZILLON <boris.brezillon at free-electrons.com>
> 
> 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 at free-electrons.com>
> Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> Reviewed-by: Hans de Goede <hdegoede at redhat.com>

...

> @@ -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?

Alan Stern