linux-kernel - Re: [PATCH v3 05/11] memory: add Atmel EBI (External Bus Interface) driver

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Date:	Mon, 15 Dec 2014 11:22:30 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Alexander Stein <alexanders83@....de>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	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>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: Re: [PATCH v3 05/11] memory: add Atmel EBI (External Bus Interface)
 driver

Hi Alexander,

On Tue, 09 Dec 2014 21:53:12 +0100
Alexander Stein <alexanders83@....de> wrote:

> Hi,
> 
> On Monday 01 December 2014, 11:27:21 wrote Boris Brezillon:
> > +static int at91_ebi_probe(struct platform_device *pdev)
> > +{
> > +	const struct of_device_id *match;
> > +	struct device_node *child;
> > +	struct device_node *np;
> > +	struct at91_ebi *ebi;
> > +	struct clk *clk;
> > +	int ret;
> > +
> > +	match = of_match_device(at91_ebi_id_table, &pdev->dev);
> > +	if (!match || !match->data)
> > +		return -EINVAL;
> > +
> > +	ebi = devm_kzalloc(&pdev->dev, sizeof(*ebi), GFP_KERNEL);
> > +	if (!ebi)
> > +		return -ENOMEM;
> > +
> > +	ebi->caps = match->data;
> > +	ebi->dev = &pdev->dev;
> > +
> > +	clk = devm_clk_get(&pdev->dev, NULL);
> > +	if (IS_ERR(clk))
> > +		return PTR_ERR(clk);
> > +
> > +	ebi->clk = clk;
> > +
> > +	np = of_parse_phandle(pdev->dev.of_node, "atmel,smc", 0);
> > +	if (!np)
> > +		return -EINVAL;
> > +
> > +	ebi->smc = syscon_node_to_regmap(np);
> > +	if (IS_ERR(ebi->smc))
> > +		return PTR_ERR(ebi->smc);
> > +
> > +	/*
> > +	 * The sama5d3 does not provide an EBICSA register and thus does need
> > +	 * to access the matrix registers.
> > +	 */
> > +	if (ebi->caps->ebi_csa) {
> > +		np = of_parse_phandle(pdev->dev.of_node, "atmel,matrix", 0);
> > +		if (np)
>          ^^^^^^^
> Shouldn't this be if (!np)?

Absolutely, thanks for pointing this out.
I'll test on other at91 platforms (I currently only test on sama5d3
boards, which do not have this EBICSA register) before submitting a new
version.

Regards,

Boris



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