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

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Date:	Fri, 1 Apr 2011 14:10:21 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Shawn Guo <shawn.guo@...aro.org>, <linaro-dev@...ts.linaro.org>,
	<sameo@...ux.intel.com>, <patches@...aro.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] mmc: sdhci: make sdhci-pltfm device drivers self
 registered

On Thu, Mar 31, 2011 at 09:33:22AM -0600, Grant Likely wrote:
> 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>
> 
> Looks really good.  Relatively minor comments below, but you can add
> this to the next version:
> 
> Reviewed-by: Grant Likely <grant.likely@...retlab.ca>
> 
Thanks for the review.

[...]
> > +
> > +static int __devinit sdhci_cns3xxx_probe(struct platform_device *pdev)
> > +{
> > +	struct sdhci_host *host;
> > +	int ret;
> > +
> > +	host = sdhci_pltfm_init(pdev, &sdhci_cns3xxx_pdata);
> > +	if (!host)
> > +		return -ENOMEM;
> > +
> > +	ret = sdhci_add_host(host);
> > +	if (ret)
> > +		goto err_add_host;
> > +
> > +	return 0;
> > +
> > +err_add_host:
> > +	sdhci_pltfm_free(pdev);
> > +	return ret;
> > +}
> 
> This pattern in this function is used by 2 drivers in this patch, and
> 2 more users (with the addition of an sdhci_get_of_property() call) in
> the 3rd patch.  An sdchi_pltfm_register(pdev, &pdata) that does the
> whole sequence would probably be valuable.  Same for the _remove hook.
> 
OK, one more pair of helper function will be added.

> Drivers that still need 2 stage registration, like the tegra driver,
> would still be able to call sdhci_pltfm_init() and sdhci_add_host()
> directly.
> 
> > +
> > +static int __devexit sdhci_cns3xxx_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;
> > +
> > +	sdhci_remove_host(host, dead);
> 
> The following would be equivalent to the above three lines:
> 
> 	sdhci_remove_host(host, scratch == (u32)-1);
> 
OK.

[...]
> > @@ -3,7 +3,7 @@
> >   *
> >   * Author: Saeed Bishara <saeed@...vell.com>
> >   *	   Mike Rapoport <mike@...pulab.co.il>
> > - * Based on sdhci-cns3xxx.c
> > + * Based on sdhci-dove.c
> 
> This file *is* sdhci-dove.c.  Did you intend this change?  :-)
> 
My bad.

[...]
> > +#ifdef CONFIG_OF
> > +	plat = kzalloc(sizeof(*plat), GFP_KERNEL);
> > +	if (!plat) {
> > +		rc = -ENOMEM;
> > +		goto err_no_plat;
> > +	}
> > +	pdev->dev.platform_data = plat;
> > +
> > +	plat->cd_gpio = of_get_gpio(pdev->dev.of_node, 0);
> > +	plat->wp_gpio = of_get_gpio(pdev->dev.of_node, 1);
> > +	plat->power_gpio = of_get_gpio(pdev->dev.of_node, 2);
> > +
> > +	dev_info(&pdev->dev, "using gpios cd=%i, wp=%i power=%i\n",
> > +		plat->cd_gpio, plat->wp_gpio, plat->power_gpio);
> > +#endif
> 
> This will need to be reworked for mainline since the Tegra device tree
> support only exists in my git tree.  Basing it on devicetree/arm would
> work.
> 
OK. Will against mmc-next and test esdhc dt changes on devicetree/arm.

-- 
Regards,
Shawn

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