clk: raspberrypi: register platform device for raspberrypi-cpufreq

As 'clk-raspberrypi' depends on RPi's firmware interface, which might be
configured as a module, the cpu clock might not be available for the
cpufreq driver during it's init process. So we register the
'raspberrypi-cpufreq' platform device after the probe sequence succeeds.

Signed-off-by: Nicolas Saenz Julienne <[e-mail]>
Acked-by: Eric Anholt <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/bcm/clk-raspberrypi.c

···
 struct raspberrypi_clk {
 	struct device *dev;
 	struct rpi_firmware *firmware;
+	struct platform_device *cpufreq;
 
 	unsigned long min_rate;
 	unsigned long max_rate;
···
 
 	rpi->dev = dev;
 	rpi->firmware = firmware;
+	platform_set_drvdata(pdev, rpi);
 
 	ret = raspberrypi_register_pllb(rpi);
 	if (ret) {
···
 	if (ret)
 		return ret;
 
+	rpi->cpufreq = platform_device_register_data(dev, "raspberrypi-cpufreq",
+						     -1, NULL, 0);
+
+	return 0;
+}
+
+static int raspberrypi_clk_remove(struct platform_device *pdev)
+{
+	struct raspberrypi_clk *rpi = platform_get_drvdata(pdev);
+
+	platform_device_unregister(rpi->cpufreq);
+
 	return 0;
 }
 
···
 		.name = "raspberrypi-clk",
 	},
 	.probe          = raspberrypi_clk_probe,
+	.remove		= raspberrypi_clk_remove,
 };
 module_platform_driver(raspberrypi_clk_driver);