ARM: ixp4xx: Turn the NPE into a platform device

Instead of registering everything related to the NPE
unconditionally in the module_init() call (which will
never work with multiplatform) create a platform device
and probe the NPE like any other device.

Put the device first in the list of devices added for
the platform so it is there when the dependent network
and crypto drivers probe later on.

This probe() path will not be taken unconditionally on
device tree boots, so remove the DT guard.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-ixp4xx/common.c

@@ -150,7 +150,13 @@ static struct platform_device ixp4xx_udc_device = {
 	},
 };
 
+static struct platform_device ixp4xx_npe_device = {
+	.name           = "ixp4xx-npe",
+	.id             = -1,
+};
+
 static struct platform_device *ixp4xx_devices[] __initdata = {
+	&ixp4xx_npe_device,
 	&ixp4xx_gpio_device,
 	&ixp4xx_udc_device,
 };

drivers/soc/ixp4xx/ixp4xx-npe.c

@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/platform_device.h>
 #include <linux/soc/ixp4xx/npe.h>
 
 #define DEBUG_MSG			0
@@ -683,16 +684,10 @@ void npe_release(struct npe *npe)
 	module_put(THIS_MODULE);
 }
 
-
-static int __init npe_init_module(void)
+static int ixp4xx_npe_probe(struct platform_device *pdev)
 {
-
 	int i, found = 0;
 
-	/* This driver does not work with device tree */
-	if (of_have_populated_dt())
-		return -ENODEV;
-
 	for (i = 0; i < NPE_COUNT; i++) {
 		struct npe *npe = &npe_tab[i];
 		if (!(ixp4xx_read_feature_bits() &
@@ -717,7 +712,7 @@ static int __init npe_init_module(void)
 	return 0;
 }
 
-static void __exit npe_cleanup_module(void)
+static int ixp4xx_npe_remove(struct platform_device *pdev)
 {
 	int i;
 
@@ -726,10 +721,18 @@ static void __exit npe_cleanup_module(void)
 			npe_reset(&npe_tab[i]);
 			release_resource(npe_tab[i].mem_res);
 		}
+
+	return 0;
 }
 
-module_init(npe_init_module);
-module_exit(npe_cleanup_module);
+static struct platform_driver ixp4xx_npe_driver = {
+	.driver = {
+		.name           = "ixp4xx-npe",
+	},
+	.probe = ixp4xx_npe_probe,
+	.remove = ixp4xx_npe_remove,
+};
+module_platform_driver(ixp4xx_npe_driver);
 
 MODULE_AUTHOR("Krzysztof Halasa");
 MODULE_LICENSE("GPL v2");