[U-Boot] [RFC PATCH 12/12] devres: add debug command to dump devres

[Masahiro Yamada]

This new command can dump all device resources associated to
each device.  The fields in every line shows:
  - The address of the resource
  - The size of the resource
  - The name of the release function
  - The stage in which the resource has been acquired (BIND/PROBE)

The output looks like this:

=> devres
- root_driver
- soc
- extbus
- serial at 54006800
    0xbfb541e8 (8 byte) devm_kmalloc_release  BIND
    0xbfb54440 (4 byte) devm_kmalloc_release  PROBE
    0xbfb54460 (4 byte) devm_kmalloc_release  PROBE
- serial at 54006900
    0xbfb54270 (8 byte) devm_kmalloc_release  BIND
- gpio at 55000000
- i2c at 58780000
    0xbfb5bce8 (12 byte) devm_kmalloc_release  PROBE
    0xbfb5bd10 (4 byte) devm_kmalloc_release  PROBE
- eeprom
    0xbfb54418 (12 byte) devm_kmalloc_release  BIND

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---

 drivers/core/Kconfig  |  6 ++++++
 drivers/core/devres.c | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index 5966801..9249ffd 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -65,3 +65,9 @@ config DEBUG_DEVRES
 	  debug resource management for a managed device.
 
 	  If you are unsure about this, Say N here.
+
+config CMD_DEVRES
+	bool "Debug command to dump device resources"
+	depends on DEBUG_DEVRES
+	help
+	  This command displays all resources allociated to each device.
diff --git a/drivers/core/devres.c b/drivers/core/devres.c
index f24bcac..71f2f67 100644
--- a/drivers/core/devres.c
+++ b/drivers/core/devres.c
@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <dm/device.h>
+#include <dm/root.h>
 
 struct devres {
 	struct list_head		entry;
@@ -136,6 +137,42 @@ void devres_release_all(struct udevice *dev)
 	release_nodes(dev, &dev->devres_head, false);
 }
 
+#ifdef CONFIG_CMD_DEVRES
+void dump_resources(struct udevice *dev, int depth)
+{
+	struct devres *dr;
+	struct udevice *child;
+
+	printf("- %s\n", dev->name);
+
+	list_for_each_entry(dr, &dev->devres_head, entry)
+		printf("    0x%p (%lu byte) %s  %s\n", dr,
+		       (unsigned long)dr->size, dr->name,
+		       dr->probe ? "PROBE" : "BIND");
+
+	list_for_each_entry(child, &dev->child_head, sibling_node)
+		dump_resources(child, depth + 1);
+}
+
+static int do_devres(cmd_tbl_t *cmdtp, int flag, int argc,
+		     char * const argv[])
+{
+	struct udevice *root;
+
+	root = dm_root();
+	if (root)
+		dump_resources(root, 0);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	devres,	1,	1,	do_devres,
+	"show device resources",
+	""
+);
+#endif
+
 /*
  * Managed kmalloc/kfree
  */
-- 
1.9.1