linux-kernel - Re: [PATCH v3 1/2] mtd: hisilicon: add a new NAND controller driver for hisilicon hip04 Soc

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Date:	Tue, 28 Oct 2014 15:22:01 +0100
From:	Frans Klaver <fransklaver@...il.com>
To:	Zhou Wang <wangzhou.bry@...il.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	haojian.zhuang@...il.com, wangzhou1@...ilicon.com,
	Rob Herring <robh+dt@...nel.org>, xuwei5@...ilicon.com,
	Kumar Gala <galak@...eaurora.org>, caizhiyong@...wei.com
Subject: Re: [PATCH v3 1/2] mtd: hisilicon: add a new NAND controller driver
 for hisilicon hip04 Soc

On Tue, Oct 28, 2014 at 11:53 AM, Zhou Wang <wangzhou.bry@...il.com> wrote:
> +
> +static int hisi_nfc_probe(struct platform_device *pdev)
> +{
> +       int ret = 0, irq, buswidth, flag, max_chips = HINFC504_MAX_CHIP;
> +       struct device *dev = &pdev->dev;
> +       struct hinfc_host *host;
> +       struct nand_chip  *chip;
> +       struct mtd_info   *mtd;
> +       struct resource   *res;
> +       struct device_node *np = dev->of_node;
> +       struct mtd_part_parser_data ppdata;
> +
> +       host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
> +       if (!host)
> +               return -ENOMEM;
> +       host->dev = dev;
> +
> +       platform_set_drvdata(pdev, host);
> +       chip = &host->chip;
> +       mtd  = &host->mtd;
> +
> +       irq = platform_get_irq(pdev, 0);
> +       if (irq < 0) {
> +               dev_err(dev, "no IRQ resource defined\n");
> +               ret = -ENXIO;
> +               goto err_res;
> +       }
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       host->iobase = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(host->iobase)) {
> +               ret = PTR_ERR(host->iobase);
> +               dev_err(dev, "devm_ioremap_resource[0] fail\n");
> +               goto err_res;
> +       }
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +       chip->IO_ADDR_R = chip->IO_ADDR_W = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(chip->IO_ADDR_R)) {
> +               ret = PTR_ERR(chip->IO_ADDR_R);
> +               dev_err(dev, "devm_ioremap_resource[1] fail\n");
> +               goto err_res;
> +       }
> +
> +       mtd->priv               = chip;
> +       mtd->owner              = THIS_MODULE;
> +       mtd->name               = "hisi_nand";

+ mtd->dev.parent = &pdev->dev;

This is a bug that lives in a bunch of other nand drivers as well.
add_mtd_device (called by mtd_device_parse_register()) expects
dev.parent to be set for properly adding a device reference to the
sysfs node.

Frans
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