linux-kernel - Re: [PATCH v4 2/2] Input: bcm-keypad: Add Broadcom keypad controller

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Date:	Sat, 28 Feb 2015 14:15:18 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Scott Branden <sbranden@...adcom.com>
Cc:	bcm-kernel-feedback-list@...adcom.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ray Jui <rjui@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] Input: bcm-keypad: Add Broadcom keypad controller

On Sat, Feb 28, 2015 at 02:10:22PM -0800, Dmitry Torokhov wrote:
> Hi Scott,
> 
> On Sat, Feb 28, 2015 at 08:35:57AM -0800, Scott Branden wrote:
> > +	/* Enable clock */
> > +
> > +	kp->clk = devm_clk_get(&pdev->dev, "peri_clk");
> > +	if (IS_ERR(kp->clk)) {
> > +		dev_info(&pdev->dev,
> > +			"No clock specified. Assuming it's enabled\n");
> 
> I was doing the final pass before applying and I think that this is not
> quite correct, as it does not handle -EPROBE_DEFER properly which is
> quite common. I think we should do something like this:
> 
> 		error = PTR_ERR(kp->clk);
> 		if (error != -ENOENT) {
> 			if (error != -EPROBE_DEFER)
> 				dev_err(.. "Failed to get clock" ...);
> 			return error;
> 		}
> 		dev_dbg(... "No clock specified" ...);
> 
> No need to resubmit if you are OK with this, I can make the change
> locally.

Hmm, also bcm_kp_start() and bcm_kp_stop() should check if kp->clk is
valid before trying to enable/disable it.

> 
> > +	}
> > +	else {
> 
> Checkpach should have warned you that it should have been "} else {";
> I'll fix it up locally along with few other cosmetic changes and
> dropping a few extra headers.
> 
> Thanks.
> 
> -- 
> Dmitry

-- 
Dmitry
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