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Re: [PATCH spi-next] spi: add Broadcom BCM63xx SPI controller driver

To: Florian Fainelli <florian@openwrt.org>
Subject: Re: [PATCH spi-next] spi: add Broadcom BCM63xx SPI controller driver
From: Wolfram Sang <w.sang@pengutronix.de>
Date: Thu, 8 Dec 2011 00:04:17 +0100
Cc: Grant Likely <grant.likely@secretlab.ca>, Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>, spi-devel-general@lists.sourceforge.net, ralf@linux-mips.org, linux-mips@linux-mips.org
In-reply-to: <1321906615-11392-1-git-send-email-florian@openwrt.org>
References: <1321906615-11392-1-git-send-email-florian@openwrt.org>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-06-14)
Hi,

> +static int __init bcm63xx_spi_probe(struct platform_device *pdev)
> +{
> +     struct resource *r;
> +     struct device *dev = &pdev->dev;
> +     struct bcm63xx_spi_pdata *pdata = pdev->dev.platform_data;
> +     int irq;
> +     struct spi_master *master;
> +     struct clk *clk;
> +     struct bcm63xx_spi *bs;
> +     int ret;
> +
> +     r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +     if (!r) {
> +             dev_err(dev, "no iomem\n");
> +             ret = -ENXIO;
> +             goto out;
> +     }
> +
> +     irq = platform_get_irq(pdev, 0);
> +     if (irq < 0) {
> +             dev_err(dev, "no irq\n");
> +             ret = -ENXIO;
> +             goto out;
> +     }
> +
> +     clk = clk_get(dev, "spi");
> +     if (IS_ERR(clk)) {
> +             dev_err(dev, "no clock for device\n");
> +             ret = -ENODEV;
> +             goto out;
> +     }
> +
> +     master = spi_alloc_master(dev, sizeof(*bs));
> +     if (!master) {
> +             dev_err(dev, "out of memory\n");
> +             ret = -ENOMEM;
> +             goto out_free;
> +     }
> +
> +     bs = spi_master_get_devdata(master);
> +     init_completion(&bs->done);
> +
> +     platform_set_drvdata(pdev, master);
> +     bs->pdev = pdev;
> +
> +     if (!request_mem_region(r->start, resource_size(r), PFX)) {
> +             dev_err(dev, "iomem request failed\n");
> +             ret = -ENXIO;
> +             goto out_put_master;
> +     }

If you'd use managed devices here (devm_*), you would not leak the
mem_region in the error path :) If you use the shiny new
devm_request_and_ioremap() from linux-next, you'd save a few more lines.


> +#ifdef CONFIG_PM
> +static int bcm63xx_spi_suspend(struct platform_device *pdev, pm_message_t 
> mesg)
> +{
> +     struct spi_master *master = platform_get_drvdata(pdev);
> +     struct bcm63xx_spi *bs = spi_master_get_devdata(master);
> +
> +     clk_disable(bs->clk);
> +
> +     return 0;
> +}
> +
> +static int bcm63xx_spi_resume(struct platform_device *pdev)
> +{
> +     struct spi_master *master = platform_get_drvdata(pdev);
> +     struct bcm63xx_spi *bs = spi_master_get_devdata(master);
> +
> +     clk_enable(bs->clk);
> +
> +     return 0;
> +}
> +#else
> +#define bcm63xx_spi_suspend  NULL
> +#define bcm63xx_spi_resume   NULL
> +#endif

dev_pm_ops?

> +
> +static struct platform_driver bcm63xx_spi_driver = {
> +     .driver = {
> +             .name   = "bcm63xx-spi",
> +             .owner  = THIS_MODULE,
> +     },
> +     .probe          = bcm63xx_spi_probe,
> +     .remove         = __exit_p(bcm63xx_spi_remove),
> +     .suspend        = bcm63xx_spi_suspend,
> +     .resume         = bcm63xx_spi_resume,
> +};
> +
> +

module_platform_driver?

> +static int __init bcm63xx_spi_init(void)
> +{
> +     return platform_driver_register(&bcm63xx_spi_driver);
> +}
> +
> +static void __exit bcm63xx_spi_exit(void)
> +{
> +     platform_driver_unregister(&bcm63xx_spi_driver);
> +}
> +
> +module_init(bcm63xx_spi_init);
> +module_exit(bcm63xx_spi_exit);
> +
> +MODULE_ALIAS("platform:bcm63xx_spi");
> +MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
> +MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>");
> +MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION(DRV_VER);

VERSION is not needed.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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