ARM: omap2+: gpmc-nand: Use dynamic platform_device_alloc()

GPMC controller supports up to 8 memory devices connected to it.
Since there is one statically allocated "struct platform_device
gpmc_nand_device" it is not possible to configure the system to
use more than one NAND device connected to the GPMC. This
modification makes it possible to use up to 8 NAND devices
connected to the GPMC controller.

Signed-off-by: Rostislav Lisovy <lisovy@merica.cz>
Signed-off-by: Roger Quadros <rogerq@ti.com>

1 files changed, 37 insertions, 42 deletions

diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
index 17cd39360afe..7ab486eeb769 100644
--- a/arch/arm/mach-omap2/gpmc-nand.c
+++ b/arch/arm/mach-omap2/gpmc-nand.c
@@ -24,25 +24,6 @@
 /* minimum size for IO mapping */
 #define NAND_IO_SIZE    4
 
-static struct resource gpmc_nand_resource[] = {
-        {
-                .flags          = IORESOURCE_MEM,
-        },
-        {
-                .flags          = IORESOURCE_IRQ,
-        },
-        {
-                .flags          = IORESOURCE_IRQ,
-        },
-};
-
-static struct platform_device gpmc_nand_device = {
-        .name           = "omap2-nand",
-        .id             = 0,
-        .num_resources  = ARRAY_SIZE(gpmc_nand_resource),
-        .resource       = gpmc_nand_resource,
-};
-
 static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt)
 {
         /* platforms which support all ECC schemes */
@@ -93,43 +74,41 @@ int gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data,
 {
         int err = 0;
         struct gpmc_settings s;
-        struct device *dev = &gpmc_nand_device.dev;
-
-        memset(&s, 0, sizeof(struct gpmc_settings));
+        struct platform_device *pdev;
+        struct resource gpmc_nand_res[] = {
+                { .flags = IORESOURCE_MEM, },
+                { .flags = IORESOURCE_IRQ, },
+                { .flags = IORESOURCE_IRQ, },
+        };
 
-        gpmc_nand_device.dev.platform_data = gpmc_nand_data;
+        BUG_ON(gpmc_nand_data->cs >= GPMC_CS_NUM);
 
         err = gpmc_cs_request(gpmc_nand_data->cs, NAND_IO_SIZE,
-                                (unsigned long *)&gpmc_nand_resource[0].start);
+                              (unsigned long *)&gpmc_nand_res[0].start);
         if (err < 0) {
-                dev_err(dev, "Cannot request GPMC CS %d, error %d\n",
-                        gpmc_nand_data->cs, err);
+                pr_err("omap2-gpmc: Cannot request GPMC CS %d, error %d\n",
+                       gpmc_nand_data->cs, err);
                 return err;
         }
-
-        gpmc_nand_resource[0].end = gpmc_nand_resource[0].start +
-                                                        NAND_IO_SIZE - 1;
-
-        gpmc_nand_resource[1].start =
-                                gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE);
-        gpmc_nand_resource[2].start =
-                                gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT);
+        gpmc_nand_res[0].end = gpmc_nand_res[0].start + NAND_IO_SIZE - 1;
+        gpmc_nand_res[1].start = gpmc_get_client_irq(GPMC_IRQ_FIFOEVENTENABLE);
+        gpmc_nand_res[2].start = gpmc_get_client_irq(GPMC_IRQ_COUNT_EVENT);
 
         if (gpmc_t) {
                 err = gpmc_cs_set_timings(gpmc_nand_data->cs, gpmc_t);
                 if (err < 0) {
-                        dev_err(dev, "Unable to set gpmc timings: %d\n", err);
+                        pr_err("omap2-gpmc: Unable to set gpmc timings: %d\n", err);
                         return err;
                 }
         }
 
+        memset(&s, 0, sizeof(struct gpmc_settings));
         if (gpmc_nand_data->of_node)
                 gpmc_read_settings_dt(gpmc_nand_data->of_node, &s);
         else
                 gpmc_set_legacy(gpmc_nand_data, &s);
 
         s.device_nand = true;
-
         err = gpmc_cs_program_settings(gpmc_nand_data->cs, &s);
         if (err < 0)
                 goto out_free_cs;
@@ -141,18 +120,34 @@ int gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data,
         gpmc_update_nand_reg(&gpmc_nand_data->reg, gpmc_nand_data->cs);
 
         if (!gpmc_hwecc_bch_capable(gpmc_nand_data->ecc_opt)) {
-                dev_err(dev, "Unsupported NAND ECC scheme selected\n");
-                return -EINVAL;
+                pr_err("omap2-nand: Unsupported NAND ECC scheme selected\n");
+                err = -EINVAL;
+                goto out_free_cs;
         }
 
-        err = platform_device_register(&gpmc_nand_device);
-        if (err < 0) {
-                dev_err(dev, "Unable to register NAND device\n");
-                goto out_free_cs;
+
+        pdev = platform_device_alloc("omap2-nand", gpmc_nand_data->cs);
+        if (pdev) {
+                err = platform_device_add_resources(pdev, gpmc_nand_res,
+                                                    ARRAY_SIZE(gpmc_nand_res));
+                if (!err)
+                        pdev->dev.platform_data = gpmc_nand_data;
+        } else {
+                err = -ENOMEM;
+        }
+        if (err)
+                goto out_free_pdev;
+
+        err = platform_device_add(pdev);
+        if (err) {
+                dev_err(&pdev->dev, "Unable to register NAND device\n");
+                goto out_free_pdev;
         }
 
         return 0;
 
+out_free_pdev:
+        platform_device_put(pdev);
 out_free_cs:
         gpmc_cs_free(gpmc_nand_data->cs);