linux-kernel - Re: [PATCH 2/3] nvmem: mediatek: Add Mediatek EFUSE driver

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Message-ID: <20151026102834.GE25308@pengutronix.de>
Date:	Mon, 26 Oct 2015 11:28:34 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	andrew-ct.chen@...iatek.com,
	Maxime Ripard <maxime.ripard@...e-electrons.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>,
	Matthias Brugger <matthias.bgg@...il.com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
	srv_heupstream@...iatek.com
Subject: Re: [PATCH 2/3] nvmem: mediatek: Add Mediatek EFUSE driver

On Mon, Oct 26, 2015 at 09:56:24AM +0000, Srinivas Kandagatla wrote:
> >+	.val_bits = 32,
> >+	.reg_stride = 4,
> >+};
> >+
> >+static int mtk_efuse_probe(struct platform_device *pdev)
> >+{
> >+	struct device *dev = &pdev->dev;
> >+	struct resource *res;
> >+	struct nvmem_device *nvmem;
> >+	struct nvmem_config *econfig;
> >+	struct regmap *regmap;
> >+	void __iomem *base;
> >+
> >+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >+	base = devm_ioremap_resource(dev, res);
> >+	if (IS_ERR(base))
> >+		return PTR_ERR(base);
> >+
> >+	econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
> >+	if (!econfig)
> >+		return -ENOMEM;
> Why not use static econfig variable?

Because drivers should not assume there is only one instance of them in
the system. The qfprom driver does this and it's only a matter of
putting a second qcom,qfprom node into the device tree to break the
driver.

Sascha

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