mfd: syscon: Add non-DT support

This patch allow using syscon driver from the platform data, i.e.
possibility using driver on systems without oftree support.
For search syscon device from the client drivers,
"syscon_regmap_lookup_by_pdevname" function was added.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 45 insertions, 30 deletions

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 674af1432807..7905d36d0517 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -29,7 +29,7 @@ struct syscon {
         struct regmap *regmap;
 };
 
-static int syscon_match(struct device *dev, void *data)
+static int syscon_match_node(struct device *dev, void *data)
 {
         struct device_node *dn = data;
 
@@ -42,7 +42,7 @@ struct regmap *syscon_node_to_regmap(struct device_node *np)
         struct device *dev;
 
         dev = driver_find_device(&syscon_driver.driver, NULL, np,
-                                 syscon_match);
+                                 syscon_match_node);
         if (!dev)
                 return ERR_PTR(-EPROBE_DEFER);
 
@@ -68,6 +68,34 @@ struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
 }
 EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
 
+static int syscon_match_pdevname(struct device *dev, void *data)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        const struct platform_device_id *id = platform_get_device_id(pdev);
+
+        if (id)
+                if (!strcmp(id->name, (const char *)data))
+                        return 1;
+
+        return !strcmp(dev_name(dev), (const char *)data);
+}
+
+struct regmap *syscon_regmap_lookup_by_pdevname(const char *s)
+{
+        struct device *dev;
+        struct syscon *syscon;
+
+        dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
+                                 syscon_match_pdevname);
+        if (!dev)
+                return ERR_PTR(-EPROBE_DEFER);
+
+        syscon = dev_get_drvdata(dev);
+
+        return syscon->regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname);
+
 struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
                                         const char *property)
 {
@@ -99,28 +127,22 @@ static struct regmap_config syscon_regmap_config = {
 static int syscon_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
-        struct device_node *np = dev->of_node;
         struct syscon *syscon;
-        struct resource res;
-        int ret;
-
-        if (!np)
-                return -ENOENT;
+        struct resource *res;
 
-        syscon = devm_kzalloc(dev, sizeof(struct syscon),
-                            GFP_KERNEL);
+        syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
         if (!syscon)
                 return -ENOMEM;
 
-        syscon->base = of_iomap(np, 0);
-        if (!syscon->base)
-                return -EADDRNOTAVAIL;
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENOENT;
 
-        ret = of_address_to_resource(np, 0, &res);
-        if (ret)
-                return ret;
+        syscon->base = devm_ioremap(dev, res->start, resource_size(res));
+        if (!syscon->base)
+                return -ENOMEM;
 
-        syscon_regmap_config.max_register = res.end - res.start - 3;
+        syscon_regmap_config.max_register = res->end - res->start - 3;
         syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
                                         &syscon_regmap_config);
         if (IS_ERR(syscon->regmap)) {
@@ -130,22 +152,15 @@ static int syscon_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, syscon);
 
-        dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
-                res.start, res.end);
+        dev_info(dev, "regmap 0x%x-0x%x registered\n", res->start, res->end);
 
         return 0;
 }
 
-static int syscon_remove(struct platform_device *pdev)
-{
-        struct syscon *syscon;
-
-        syscon = platform_get_drvdata(pdev);
-        iounmap(syscon->base);
-        platform_set_drvdata(pdev, NULL);
-
-        return 0;
-}
+static const struct platform_device_id syscon_ids[] = {
+        { "syscon", },
+        { }
+};
 
 static struct platform_driver syscon_driver = {
         .driver = {
@@ -154,7 +169,7 @@ static struct platform_driver syscon_driver = {
                 .of_match_table = of_syscon_match,
         },
         .probe          = syscon_probe,
-        .remove         = syscon_remove,
+        .id_table       = syscon_ids,
 };
 
 static int __init syscon_init(void)