linux-kernel - Re: [PATCHv5] mtd: nand: atmel

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Message-ID: <20140913105914.GD26281@piout.net>
Date:	Sat, 13 Sep 2014 12:59:14 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:	Josh Wu <josh.wu@...el.com>,
	Brian Norris <computersforpeace@...il.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv5] mtd: nand: atmel_nand: retrieve NFC clock

Hi,

On 13/09/2014 at 10:26:18 +0100, Ezequiel Garcia wrote :
> > +       nfc->clk = devm_clk_get(&pdev->dev, NULL);
> > +       if (!IS_ERR(nfc->clk)) {
> > +               ret = clk_prepare_enable(nfc->clk);
> > +               if (ret)
> > +                       return ret;
> > +       } else {
> > +               dev_warn(&pdev->dev, "NFC clock missing, update your Device Tree");
> 
> Looks much better now thanks. If the clock is not really optional, you
> can consider this a firmware bug. We've used FW_BUG messages for these
> cases
> (see vim drivers/watchdog/orion_wdt.c), so you could write something like:
> 
> dev_warn(..., FW_BUG "devicetree clock missing");
> 

Yeah, I've considered using FW_WARN like Thomas suggested but I'm not
sure it really relates to device tree. Apart from x86, FW_WARN and
FW_BUG are only used on mvebu stuff ;)


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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