Merge branch 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6

* 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6:
  of_mdio: Don't phy_scan_fixups() twice
  Devicetree: Expand on ARM Primecell binding documentation
  dt: Add empty of_match_node() macro
  dt: add empty dt helpers for non-dt build
  devicetree: fix build error on drivers/tty/serial/altera_jtaguart.c
  devicetree: Add ARM pl022 spi controller binding doc
  devicetree: Add ARM pl061 gpio controller binding doc
  of/irq: of_irq_find_parent: check for parent equal to child
  MAINTAINERS: update devicetree maintainers
  dt: add helper to read 64-bit integers
  tty: use of_match_ptr() for of_match_table entry
  OF: Add of_match_ptr() macro
  dt: add empty for_each_child_of_node, of_find_property
  devicetree: Document Qualcomm and Atmel prefixes
  serial/imx: add of_alias_get_id() reference back
  dt: add of_alias_scan and of_alias_get_id
  devicetree: Add a registry of vendor prefixes

9 files changed, 178 insertions, 25 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 3ff22e32b602..b970562e0111 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -17,14 +17,39 @@
  *      as published by the Free Software Foundation; either version
  *      2 of the License, or (at your option) any later version.
  */
+#include <linux/ctype.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
 
+/**
+ * struct alias_prop - Alias property in 'aliases' node
+ * @link:       List node to link the structure in aliases_lookup list
+ * @alias:      Alias property name
+ * @np:         Pointer to device_node that the alias stands for
+ * @id:         Index value from end of alias name
+ * @stem:       Alias string without the index
+ *
+ * The structure represents one alias property of 'aliases' node as
+ * an entry in aliases_lookup list.
+ */
+struct alias_prop {
+        struct list_head link;
+        const char *alias;
+        struct device_node *np;
+        int id;
+        char stem[0];
+};
+
+static LIST_HEAD(aliases_lookup);
+
 struct device_node *allnodes;
 struct device_node *of_chosen;
+struct device_node *of_aliases;
+
+static DEFINE_MUTEX(of_aliases_mutex);
 
 /* use when traversing tree through the allnext, child, sibling,
  * or parent members of struct device_node.
@@ -632,6 +657,35 @@ int of_property_read_u32_array(const struct device_node *np,
 EXPORT_SYMBOL_GPL(of_property_read_u32_array);
 
 /**
+ * of_property_read_u64 - Find and read a 64 bit integer from a property
+ * @np:         device node from which the property value is to be read.
+ * @propname:   name of the property to be searched.
+ * @out_value:  pointer to return value, modified only if return value is 0.
+ *
+ * Search for a property in a device node and read a 64-bit value from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * The out_value is modified only if a valid u64 value can be decoded.
+ */
+int of_property_read_u64(const struct device_node *np, const char *propname,
+                         u64 *out_value)
+{
+        struct property *prop = of_find_property(np, propname, NULL);
+
+        if (!prop)
+                return -EINVAL;
+        if (!prop->value)
+                return -ENODATA;
+        if (sizeof(*out_value) > prop->length)
+                return -EOVERFLOW;
+        *out_value = of_read_number(prop->value, 2);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u64);
+
+/**
  * of_property_read_string - Find and read a string from a property
  * @np:         device node from which the property value is to be read.
  * @propname:   name of the property to be searched.
@@ -988,3 +1042,99 @@ out_unlock:
 }
 #endif /* defined(CONFIG_OF_DYNAMIC) */
 
+static void of_alias_add(struct alias_prop *ap, struct device_node *np,
+                         int id, const char *stem, int stem_len)
+{
+        ap->np = np;
+        ap->id = id;
+        strncpy(ap->stem, stem, stem_len);
+        ap->stem[stem_len] = 0;
+        list_add_tail(&ap->link, &aliases_lookup);
+        pr_debug("adding DT alias:%s: stem=%s id=%i node=%s\n",
+                 ap->alias, ap->stem, ap->id, np ? np->full_name : NULL);
+}
+
+/**
+ * of_alias_scan - Scan all properties of 'aliases' node
+ *
+ * The function scans all the properties of 'aliases' node and populate
+ * the the global lookup table with the properties.  It returns the
+ * number of alias_prop found, or error code in error case.
+ *
+ * @dt_alloc:   An allocator that provides a virtual address to memory
+ *              for the resulting tree
+ */
+void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
+{
+        struct property *pp;
+
+        of_chosen = of_find_node_by_path("/chosen");
+        if (of_chosen == NULL)
+                of_chosen = of_find_node_by_path("/chosen@0");
+        of_aliases = of_find_node_by_path("/aliases");
+        if (!of_aliases)
+                return;
+
+        for_each_property(pp, of_aliases->properties) {
+                const char *start = pp->name;
+                const char *end = start + strlen(start);
+                struct device_node *np;
+                struct alias_prop *ap;
+                int id, len;
+
+                /* Skip those we do not want to proceed */
+                if (!strcmp(pp->name, "name") ||
+                    !strcmp(pp->name, "phandle") ||
+                    !strcmp(pp->name, "linux,phandle"))
+                        continue;
+
+                np = of_find_node_by_path(pp->value);
+                if (!np)
+                        continue;
+
+                /* walk the alias backwards to extract the id and work out
+                 * the 'stem' string */
+                while (isdigit(*(end-1)) && end > start)
+                        end--;
+                len = end - start;
+
+                if (kstrtoint(end, 10, &id) < 0)
+                        continue;
+
+                /* Allocate an alias_prop with enough space for the stem */
+                ap = dt_alloc(sizeof(*ap) + len + 1, 4);
+                if (!ap)
+                        continue;
+                ap->alias = start;
+                of_alias_add(ap, np, id, start, len);
+        }
+}
+
+/**
+ * of_alias_get_id - Get alias id for the given device_node
+ * @np:         Pointer to the given device_node
+ * @stem:       Alias stem of the given device_node
+ *
+ * The function travels the lookup table to get alias id for the given
+ * device_node and alias stem.  It returns the alias id if find it.
+ */
+int of_alias_get_id(struct device_node *np, const char *stem)
+{
+        struct alias_prop *app;
+        int id = -ENODEV;
+
+        mutex_lock(&of_aliases_mutex);
+        list_for_each_entry(app, &aliases_lookup, link) {
+                if (strcmp(app->stem, stem) != 0)
+                        continue;
+
+                if (np == app->np) {
+                        id = app->id;
+                        break;
+                }
+        }
+        mutex_unlock(&of_aliases_mutex);
+
+        return id;
+}
+EXPORT_SYMBOL_GPL(of_alias_get_id);
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 65200af29c52..aeec35bc3789 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -707,10 +707,8 @@ void __init unflatten_device_tree(void)
         __unflatten_device_tree(initial_boot_params, &allnodes,
                                 early_init_dt_alloc_memory_arch);
 
-        /* Get pointer to OF "/chosen" node for use everywhere */
-        of_chosen = of_find_node_by_path("/chosen");
-        if (of_chosen == NULL)
-                of_chosen = of_find_node_by_path("/chosen@0");
+        /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
+        of_alias_scan(early_init_dt_alloc_memory_arch);
 }
 
 #endif /* CONFIG_OF_EARLY_FLATTREE */
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 9f689f1da0fc..6a5b5e777dd2 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -58,27 +58,27 @@ EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
  */
 struct device_node *of_irq_find_parent(struct device_node *child)
 {
-        struct device_node *p;
+        struct device_node *p, *c = child;
         const __be32 *parp;
 
-        if (!of_node_get(child))
+        if (!of_node_get(c))
                 return NULL;
 
         do {
-                parp = of_get_property(child, "interrupt-parent", NULL);
+                parp = of_get_property(c, "interrupt-parent", NULL);
                 if (parp == NULL)
-                        p = of_get_parent(child);
+                        p = of_get_parent(c);
                 else {
                         if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
                                 p = of_node_get(of_irq_dflt_pic);
                         else
                                 p = of_find_node_by_phandle(be32_to_cpup(parp));
                 }
-                of_node_put(child);
-                child = p;
+                of_node_put(c);
+                c = p;
         } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
 
-        return p;
+        return (p == child) ? NULL : p;
 }
 
 /**
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index d35e300b0ad1..980c079e4443 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -83,7 +83,6 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
                                 addr);
                         continue;
                 }
-                phy_scan_fixups(phy);
 
                 /* Associate the OF node with the device structure so it
                  * can be looked up later */
diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
index 4d87b5dc9284..bc5b3990f6ed 100644
--- a/drivers/of/pdt.c
+++ b/drivers/of/pdt.c
@@ -229,6 +229,11 @@ static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
         return ret;
 }
 
+static void *kernel_tree_alloc(u64 size, u64 align)
+{
+        return prom_early_alloc(size);
+}
+
 void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
 {
         struct device_node **nextp;
@@ -245,4 +250,7 @@ void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
         nextp = &allnodes->allnext;
         allnodes->child = of_pdt_build_tree(allnodes,
                         of_pdt_prom_ops->getchild(allnodes->phandle), &nextp);
+
+        /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
+        of_alias_scan(kernel_tree_alloc);
 }
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 00a73ecb2dfb..530181e49f6b 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/console.h>
+#include <linux/of.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/serial.h>
@@ -472,8 +473,6 @@ static struct of_device_id altera_jtaguart_match[] = {
         {},
 };
 MODULE_DEVICE_TABLE(of, altera_jtaguart_match);
-#else
-#define altera_jtaguart_match NULL
 #endif /* CONFIG_OF */
 
 static struct platform_driver altera_jtaguart_platform_driver = {
@@ -482,7 +481,7 @@ static struct platform_driver altera_jtaguart_platform_driver = {
         .driver = {
                 .name           = DRV_NAME,
                 .owner          = THIS_MODULE,
-                .of_match_table = altera_jtaguart_match,
+                .of_match_table = of_match_ptr(altera_jtaguart_match),
         },
 };
 
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index d902558ccfd2..1d04c5037f25 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -616,8 +616,6 @@ static struct of_device_id altera_uart_match[] = {
         {},
 };
 MODULE_DEVICE_TABLE(of, altera_uart_match);
-#else
-#define altera_uart_match NULL
 #endif /* CONFIG_OF */
 
 static struct platform_driver altera_uart_platform_driver = {
@@ -626,7 +624,7 @@ static struct platform_driver altera_uart_platform_driver = {
         .driver = {
                 .name           = DRV_NAME,
                 .owner          = THIS_MODULE,
-                .of_match_table = altera_uart_match,
+                .of_match_table = of_match_ptr(altera_uart_match),
         },
 };
 
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 54ffdc6243f9..163fc9021f5a 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1290,17 +1290,20 @@ static int serial_imx_resume(struct platform_device *dev)
 static int serial_imx_probe_dt(struct imx_port *sport,
                 struct platform_device *pdev)
 {
-        static int portnum = 0;
         struct device_node *np = pdev->dev.of_node;
         const struct of_device_id *of_id =
                         of_match_device(imx_uart_dt_ids, &pdev->dev);
+        int ret;
 
         if (!np)
                 return -ENODEV;
 
-        sport->port.line = portnum++;
-        if (sport->port.line >= UART_NR)
-                return -EINVAL;
+        ret = of_alias_get_id(np, "serial");
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
+                return -ENODEV;
+        }
+        sport->port.line = ret;
 
         if (of_get_property(np, "fsl,uart-has-rtscts", NULL))
                 sport->have_rtscts = 1;
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index b908615ccaaf..6cd414341d5e 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -569,8 +569,6 @@ static struct of_device_id ulite_of_match[] __devinitdata = {
         {}
 };
 MODULE_DEVICE_TABLE(of, ulite_of_match);
-#else /* CONFIG_OF */
-#define ulite_of_match NULL
 #endif /* CONFIG_OF */
 
 static int __devinit ulite_probe(struct platform_device *pdev)
@@ -610,7 +608,7 @@ static struct platform_driver ulite_platform_driver = {
         .driver = {
                 .owner = THIS_MODULE,
                 .name  = "uartlite",
-                .of_match_table = ulite_of_match,
+                .of_match_table = of_match_ptr(ulite_of_match),
         },
 };