ARM: ixp4xx: Turn the QMGR into a platform device

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

Put the device second 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

@@ -155,8 +155,14 @@ static struct platform_device ixp4xx_npe_device = {
 	.id             = -1,
 };
 
+static struct platform_device ixp4xx_qmgr_device = {
+	.name           = "ixp4xx-qmgr",
+	.id             = -1,
+};
+
 static struct platform_device *ixp4xx_devices[] __initdata = {
 	&ixp4xx_npe_device,
+	&ixp4xx_qmgr_device,
 	&ixp4xx_gpio_device,
 	&ixp4xx_udc_device,
 };

drivers/soc/ixp4xx/ixp4xx-qmgr.c

@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/platform_device.h>
 #include <linux/soc/ixp4xx/qmgr.h>
 
 /* FIXME: get rid of these static assigments */
@@ -288,15 +289,11 @@ void qmgr_release_queue(unsigned int queue)
 	module_put(THIS_MODULE);
 }
 
-static int qmgr_init(void)
+static int ixp4xx_qmgr_probe(struct platform_device *pdev)
 {
 	int i, err;
 	irq_handler_t handler1, handler2;
 
-	/* This driver does not work with device tree */
-	if (of_have_populated_dt())
-		return -ENODEV;
-
 	mem_res = request_mem_region(IXP4XX_QMGR_BASE_PHYS,
 				     IXP4XX_QMGR_REGION_SIZE,
 				     "IXP4xx Queue Manager");
@@ -355,17 +352,25 @@ static int qmgr_init(void)
 	return err;
 }
 
-static void qmgr_remove(void)
+static int ixp4xx_qmgr_remove(struct platform_device *pdev)
 {
 	free_irq(IRQ_IXP4XX_QM1, NULL);
 	free_irq(IRQ_IXP4XX_QM2, NULL);
 	synchronize_irq(IRQ_IXP4XX_QM1);
 	synchronize_irq(IRQ_IXP4XX_QM2);
 	release_mem_region(IXP4XX_QMGR_BASE_PHYS, IXP4XX_QMGR_REGION_SIZE);
+
+	return 0;
 }
 
-module_init(qmgr_init);
-module_exit(qmgr_remove);
+static struct platform_driver ixp4xx_qmgr_driver = {
+	.driver = {
+		.name           = "ixp4xx-qmgr",
+	},
+	.probe = ixp4xx_qmgr_probe,
+	.remove = ixp4xx_qmgr_remove,
+};
+module_platform_driver(ixp4xx_qmgr_driver);
 
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Krzysztof Halasa");