linux-kernel - Re: [PATCH] mtd: nand: atmel

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Message-ID: <20140911173854.73b201e7@bbrezillon>
Date:	Thu, 11 Sep 2014 17:38:54 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Brian Norris <computersforpeace@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mtd: nand: atmel_nand: retrieve NFC clock

Hi Ezequiel,

On Thu, 11 Sep 2014 12:20:30 -0300
Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> wrote:

> Hi Alexandre,
> 
> On 11 Sep 04:43 PM, Alexandre Belloni wrote:
> > @@ -2276,6 +2280,16 @@ static int atmel_nand_nfc_probe(struct platform_device *pdev)
> >  		}
> >  	}
> >  
> > +	nfc->clk = devm_clk_get(&pdev->dev, NULL);
> > +	if (IS_ERR(nfc->clk)) {
> > +		dev_warn(&pdev->dev, "NFC clock is missing");
> > +		return 0;
> > +	}
> > +
> 
> The binding documentation makes no mention to a clock.

You're right, I didn't update atmel,nand DT binding doc.

> 
> Anyway, with or without the docs I think this patch breaks DT backward
> compatibility.
> 
> Or am I missing something?

Indeed, this block of code should be placed at the end of the probe
function. I'll fix that.

Note that if the clk is missing it just print a warning message and
return 0, so after moving the code, it should not break DT backward
compat ;-).

Best Regards,

Boris
-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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