linux-kernel - Re: [PATCH] usb: phy: samsung: Add support to set pmu isolation

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Date:	Mon, 14 Jan 2013 14:11:42 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Vivek Gautam <gautam.vivek@...sung.com>
Cc:	linux-usb@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	gregkh@...uxfoundation.org, balbi@...com,
	Kukjin Kim <kgene.kim@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	t.figa@...sung.com, Ben Dooks <ben-linux@...ff.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	l.majewski@...sung.com, Kyungmin Park <kyungmin.park@...sung.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Heiko Stübner <heiko@...ech.de>,
	Praveen Paneri <p.paneri@...sung.com>
Subject: Re: [PATCH] usb: phy: samsung: Add support to set pmu isolation

Vivek,

Sorry for being so absent from these reviews.  I'll try to look over a
few patches today, but please don't hold up anything on account of my
reviews.  I'm definitely a bit of an interested bystander in USB land.
 ;)

In general things look pretty good here.  :)  One last comment below...

On Fri, Jan 11, 2013 at 12:08 AM, Vivek Gautam
<gautam.vivek@...sung.com> wrote:> +static int
samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
> +{
> +       struct device_node *usbphy_sys;
> +
> +       /* Getting node for system controller interface for usb-phy */
> +       usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
> +       if (!usbphy_sys)
> +               dev_warn(sphy->dev, "No sys-controller interface for usb-phy\n");

Seems like you ought to return with an error here.  Calling of_iomap()
with a NULL value seems undesirable.

> +
> +       sphy->pmuregs = of_iomap(usbphy_sys, 0);
> +
> +       of_node_put(usbphy_sys);
> +
> +       if (sphy->pmuregs == NULL) {
> +               dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
> +               return -ENODEV;
> +       }
> +
> +       return 0;
> +}
> +
> +/*
> + * Set isolation here for phy.
> + * Here 'on = true' would mean USB PHY block is isolated, hence
> + * de-activated and vice-versa.
> + */

Thank you very much for this comment.  :)  This explains one of the
confusions I had earlier...


Once you fix the one error condition above you can add my
"Reviewed-by".  Thanks!

-Doug
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