[PATCH 1/2] stmac: add dwmac glue for NXP 18xx/43xx family

On Monday 04 May 2015 00:14:11 Joachim Eastwood wrote:
=> >It should be fairly straightforward to split the probe function

quoted

into two and export a function that takes a device and a stmmac_of_data
pointer as arguments, and declare a module_platform_driver in your
code.

How about something like the patch below. All it does is to play a
little trick with the of_match_device in the dt config function and
export the probe/remove/pm stuff for the driver.

The dwmac-lpc18xx would then become something like this:

static const struct stmmac_of_data lpc18xx_dwmac_data = {
	.has_gmac = 1,
	.setup = lpc18xx_dwmac_setup,
	.init = lpc18xx_dwmac_init,
};

static const struct of_device_id lpc18xx_dwmac_match[] = {
	{ .compatible = "nxp,lpc1850-dwmac", .data = &lpc18xx_dwmac_data },
	{ }
};
MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);

static struct platform_driver lpc18xx_dwmac_driver = {
	.probe  = stmmac_pltfr_probe,
	.remove = stmmac_pltfr_remove,
	.driver = {
		.name           = "lpc18xx-dwmac",
		.pm             = &stmmac_pltfr_pm_ops,
		.of_match_table = lpc18xx_dwmac_match,
	},
};
module_platform_driver(lpc18xx_dwmac_driver);

All though this seem to work, stmmac_platform.c could benefit from
some refactoring. But this patch and then fixing the other DT users
could be a first step.

Sounds good, yes.

-	device = of_match_device(stmmac_dt_ids, &pdev->dev);
+	device = of_match_device(dev->driver->of_match_table, dev);
 	if (!device)
 		return -ENODEV;

Ah, that is a nice trick to avoid passing the various match tables
from a lot of duplicated probe functions.

I wonder if we could generalize that for use by any driver and
introduce a common helper

void *of_platform_match_data(struct device *dev)
{
	struct of_device_id *id;

	if (!dev || !dev->of_node)
		return NULL;

	id = of_match_device(dev->driver->of_match_table, dev);
	if (!id)
		return NULL;

	return id->data;
}
EXPORT_SYMBOL_GPL(of_platform_match_data);

I think that could save a few lines from many drivers, and it had not
occurred to me that we can take this shortcut.

The rest of your patch also looks great to me.

	Arnd