mfd: db8500-prcmu: Support platform dependant device selection

The main aim for this cycle is to have the u8540 booting to a
console. However, the u8540 doesn't support all of the u8500
platform devices yet. After this stage is complete we can then
fill in the inadequacies, such as specific clock support at a
later date. To achieve this we're placing devices supported by
all platforms into a common device structure and the remaining
ones into a platform specific one.

Cc: Samuel Ortiz <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/db8500-prcmu.c

···
 #include <linux/jiffies.h>
 #include <linux/bitops.h>
 #include <linux/fs.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/uaccess.h>
 #include <linux/mfd/core.h>
···
 	.num_trips = 4,
 };
 
+static struct mfd_cell common_prcmu_devs[] = {
+	{
+		.name = "ux500_wdt",
+		.platform_data = &db8500_wdt_pdata,
+		.pdata_size = sizeof(db8500_wdt_pdata),
+		.id = -1,
+	},
+};
+
 static struct mfd_cell db8500_prcmu_devs[] = {
 	{
 		.name = "db8500-prcmu-regulators",
···
 		.of_compatible = "stericsson,cpufreq-ux500",
 		.platform_data = &db8500_cpufreq_table,
 		.pdata_size = sizeof(db8500_cpufreq_table),
-	},
-	{
-		.name = "ux500_wdt",
-		.platform_data = &db8500_wdt_pdata,
-		.pdata_size = sizeof(db8500_wdt_pdata),
-		.id = -1,
 	},
 	{
 		.name = "db8500-thermal",
···
 
 	db8500_prcmu_update_cpufreq();
 
-	err = mfd_add_devices(&pdev->dev, 0, db8500_prcmu_devs,
-			      ARRAY_SIZE(db8500_prcmu_devs), NULL, 0, db8500_irq_domain);
+	err = mfd_add_devices(&pdev->dev, 0, common_prcmu_devs,
+			      ARRAY_SIZE(common_prcmu_devs), NULL, 0, db8500_irq_domain);
 	if (err) {
 		pr_err("prcmu: Failed to add subdevices\n");
 		return err;
+	}
+
+	/* TODO: Remove restriction when clk definitions are available. */
+	if (!of_machine_is_compatible("st-ericsson,u8540")) {
+		err = mfd_add_devices(&pdev->dev, 0, db8500_prcmu_devs,
+				      ARRAY_SIZE(db8500_prcmu_devs), NULL, 0,
+				      db8500_irq_domain);
+		if (err) {
+			mfd_remove_devices(&pdev->dev);
+			pr_err("prcmu: Failed to add subdevices\n");
+			goto no_irq_return;
+		}
 	}
 
 	err = db8500_prcmu_register_ab8500(&pdev->dev, pdata->ab_platdata,