powerpc/i2c: Convert i2c-mpc into an of_platform driver

Convert i2c-mpc to an of_platform driver. Utilize the code in
drivers/of-i2c.c to make i2c modules dynamically loadable by the
device tree.

Signed-off-by: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 60 insertions, 44 deletions

diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index a076129de7e8..4fdfb62d6f38 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -17,7 +17,8 @@
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/init.h>
-#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_i2c.h>
 
 #include <asm/io.h>
 #include <linux/fsl_devices.h>
@@ -25,13 +26,13 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 
-#define MPC_I2C_ADDR  0x00
+#define DRV_NAME "mpc-i2c"
+
 #define MPC_I2C_FDR     0x04
 #define MPC_I2C_CR      0x08
 #define MPC_I2C_SR      0x0c
 #define MPC_I2C_DR      0x10
 #define MPC_I2C_DFSRR 0x14
-#define MPC_I2C_REGION 0x20
 
 #define CCR_MEN  0x80
 #define CCR_MIEN 0x40
@@ -315,102 +316,117 @@ static struct i2c_adapter mpc_ops = {
         .timeout = 1,
 };
 
-static int fsl_i2c_probe(struct platform_device *pdev)
+static int __devinit fsl_i2c_probe(struct of_device *op, const struct of_device_id *match)
 {
         int result = 0;
         struct mpc_i2c *i2c;
-        struct fsl_i2c_platform_data *pdata;
-        struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-        pdata = (struct fsl_i2c_platform_data *) pdev->dev.platform_data;
 
         i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
         if (!i2c)
                 return -ENOMEM;
 
-        i2c->irq = platform_get_irq(pdev, 0);
-        if (i2c->irq < 0)
-                i2c->irq = NO_IRQ; /* Use polling */
+        if (of_get_property(op->node, "dfsrr", NULL))
+                i2c->flags |= FSL_I2C_DEV_SEPARATE_DFSRR;
 
-        i2c->flags = pdata->device_flags;
-        init_waitqueue_head(&i2c->queue);
+        if (of_device_is_compatible(op->node, "fsl,mpc5200-i2c") ||
+                        of_device_is_compatible(op->node, "mpc5200-i2c"))
+                i2c->flags |= FSL_I2C_DEV_CLOCK_5200;
 
-        i2c->base = ioremap((phys_addr_t)r->start, MPC_I2C_REGION);
+        init_waitqueue_head(&i2c->queue);
 
+        i2c->base = of_iomap(op->node, 0);
         if (!i2c->base) {
                 printk(KERN_ERR "i2c-mpc - failed to map controller\n");
                 result = -ENOMEM;
                 goto fail_map;
         }
 
-        if (i2c->irq != NO_IRQ)
-                if ((result = request_irq(i2c->irq, mpc_i2c_isr,
-                                          IRQF_SHARED, "i2c-mpc", i2c)) < 0) {
-                        printk(KERN_ERR
-                               "i2c-mpc - failed to attach interrupt\n");
-                        goto fail_irq;
+        i2c->irq = irq_of_parse_and_map(op->node, 0);
+        if (i2c->irq != NO_IRQ) { /* i2c->irq = NO_IRQ implies polling */
+                result = request_irq(i2c->irq, mpc_i2c_isr,
+                                     IRQF_SHARED, "i2c-mpc", i2c);
+                if (result < 0) {
+                        printk(KERN_ERR "i2c-mpc - failed to attach interrupt\n");
+                        goto fail_request;
                 }
-
+        }
+        
         mpc_i2c_setclock(i2c);
-        platform_set_drvdata(pdev, i2c);
+
+        dev_set_drvdata(&op->dev, i2c);
 
         i2c->adap = mpc_ops;
-        i2c->adap.nr = pdev->id;
         i2c_set_adapdata(&i2c->adap, i2c);
-        i2c->adap.dev.parent = &pdev->dev;
-        if ((result = i2c_add_numbered_adapter(&i2c->adap)) < 0) {
+        i2c->adap.dev.parent = &op->dev;
+
+        result = i2c_add_adapter(&i2c->adap);
+        if (result < 0) {
                 printk(KERN_ERR "i2c-mpc - failed to add adapter\n");
                 goto fail_add;
         }
+        of_register_i2c_devices(&i2c->adap, op->node);
 
         return result;
 
-      fail_add:
-        if (i2c->irq != NO_IRQ)
-                free_irq(i2c->irq, i2c);
-      fail_irq:
-        iounmap(i2c->base);
-      fail_map:
+ fail_add:
+        dev_set_drvdata(&op->dev, NULL);
+        free_irq(i2c->irq, i2c);
+ fail_request:
+        irq_dispose_mapping(i2c->irq);
+        iounmap(i2c->base);
+ fail_map:
         kfree(i2c);
         return result;
 };
 
-static int fsl_i2c_remove(struct platform_device *pdev)
+static int __devexit fsl_i2c_remove(struct of_device *op)
 {
-        struct mpc_i2c *i2c = platform_get_drvdata(pdev);
+        struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);
 
         i2c_del_adapter(&i2c->adap);
-        platform_set_drvdata(pdev, NULL);
+        dev_set_drvdata(&op->dev, NULL);
 
         if (i2c->irq != NO_IRQ)
                 free_irq(i2c->irq, i2c);
 
+        irq_dispose_mapping(i2c->irq);
         iounmap(i2c->base);
         kfree(i2c);
         return 0;
 };
 
-/* work with hotplug and coldplug */
-MODULE_ALIAS("platform:fsl-i2c");
+static const struct of_device_id mpc_i2c_of_match[] = {
+        {.compatible = "fsl-i2c",},
+        {},
+};
+MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
+
 
 /* Structure for a device driver */
-static struct platform_driver fsl_i2c_driver = {
-        .probe = fsl_i2c_probe,
-        .remove = fsl_i2c_remove,
-        .driver = {
-                .owner = THIS_MODULE,
-                .name = "fsl-i2c",
+static struct of_platform_driver mpc_i2c_driver = {
+        .match_table    = mpc_i2c_of_match,
+        .probe          = fsl_i2c_probe,
+        .remove         = __devexit_p(fsl_i2c_remove),
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = DRV_NAME,
         },
 };
 
 static int __init fsl_i2c_init(void)
 {
-        return platform_driver_register(&fsl_i2c_driver);
+        int rv;
+
+        rv = of_register_platform_driver(&mpc_i2c_driver);
+        if (rv)
+                printk(KERN_ERR DRV_NAME 
+                       " of_register_platform_driver failed (%i)\n", rv);
+        return rv;
 }
 
 static void __exit fsl_i2c_exit(void)
 {
-        platform_driver_unregister(&fsl_i2c_driver);
+        of_unregister_platform_driver(&mpc_i2c_driver);
 }
 
 module_init(fsl_i2c_init);