linux-kernel - Re: [PATCH 1/5] mmc: sdhci: make sdhci-pltfm device drivers self registered

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Message-ID: <20110419102042.GB4164@pengutronix.de>
Date:	Tue, 19 Apr 2011 12:20:42 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-mmc@...r.kernel.org,
	patches@...aro.org, linaro-dev@...ts.linaro.org,
	linux-kernel@...r.kernel.org, sameo@...ux.intel.com
Subject: Re: [PATCH 1/5] mmc: sdhci: make sdhci-pltfm device drivers self
 registered


On Fri, Mar 25, 2011 at 04:48:47PM +0800, Shawn Guo wrote:
> The patch turns the common stuff in sdhci-pltfm.c into functions, and
> add device drivers their own .probe and .remove which in turn call
> into the common functions, so that those sdhci-pltfm device drivers
> register itself and keep all device specific things away from common
> sdhci-pltfm file.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> ---

I'll second the comments from Grant (with one slight exception which is
noted below)

> +static int __devexit sdhci_dove_remove(struct platform_device *pdev)
> +{
> +	struct sdhci_host *host = platform_get_drvdata(pdev);
> +	int dead = 0;
> +	u32 scratch;
> +
> +	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> +	if (scratch == (u32)-1)
> +		dead = 1;

I'd prefer

	dead = (readl() == 0xffffffff);

(or (u32)-1 if you prefer). But keeping a variable 'dead' is more
descriptive than keeping 'scratch'.

> +MODULE_LICENSE("GPL v2");

Just to be sure: Did you double-check if the original licenses were v2
or v2+?

> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c

[...]

> -err_add_host:
> -	if (pdata && pdata->exit)
> -		pdata->exit(host);
> -err_plat_init:
> -	iounmap(host->ioaddr);
>  err_remap:
>  	release_mem_region(iomem->start, resource_size(iomem));
>  err_request:
>  	sdhci_free_host(host);
>  err:
> -	printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
> -	return ret;
> +	pr_err("%s failed %d\n", __func__, ret);

dev_err?

> +	return NULL;
>  }
>  

I didn't pay much attention to the OF version of the tegra driver, since
it still is not upstream yet, right?

Regards,

   Wolfram

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

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