[U-Boot] [PATCH 1/3] dm: core: extend API by new function: dev_get_reg()

[Przemyslaw Marczak]

After changes introduced to dev_get_addr() by:

commit: dm: core: Enable optional use of fdt_translate_address()

the mentioned function is not allowed to parse the 'reg' property
of child node for which the '#size-cells == 0'.

To fill the gap, this commit introduces new core function dev_get_reg(),
which makes it possible to get the 'reg' property's value for that use case.

Signed-off-by: Przemyslaw Marczak <p.marczak at samsung.com>
Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Marek Vasut <marex at denx.de>
Cc: Stefan Roese <sr at denx.de>
---
 drivers/core/device.c | 17 +++++++++++++----
 include/dm/device.h   | 23 +++++++++++++++++++++++
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/drivers/core/device.c b/drivers/core/device.c
index 758f390..1131175 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -581,6 +581,18 @@ const char *dev_get_uclass_name(struct udevice *dev)
 	return dev->uclass->uc_drv->name;
 }
 
+fdt_addr_t dev_get_reg(struct udevice *dev)
+{
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	return fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
+						dev->parent->of_offset,
+						dev->of_offset, "reg",
+						0, NULL);
+#else
+	return FDT_ADDR_T_NONE;
+#endif
+}
+
 fdt_addr_t dev_get_addr(struct udevice *dev)
 {
 #if CONFIG_IS_ENABLED(OF_CONTROL)
@@ -601,14 +613,11 @@ fdt_addr_t dev_get_addr(struct udevice *dev)
 					     dev->of_offset, reg);
 	}
 
+	addr = dev_get_reg(dev);
 	/*
 	 * Use the "simple" translate function for less complex
 	 * bus setups.
 	 */
-	addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
-						dev->parent->of_offset,
-						dev->of_offset, "reg",
-						0, NULL);
 	if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
 		if (device_get_uclass_id(dev->parent) == UCLASS_SIMPLE_BUS)
 			addr = simple_bus_translate(dev->parent, addr);
diff --git a/include/dm/device.h b/include/dm/device.h
index 7fb9935..08bcb02 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -445,8 +445,31 @@ int device_find_first_child(struct udevice *parent, struct udevice **devp);
 int device_find_next_child(struct udevice **devp);
 
 /**
+ * dev_get_reg() - Get the reg property of a device
+ *
+ * This returns the address without bus/child address space translation.
+ *
+ * @dev: Pointer to a device
+ *
+ * @return addr
+ */
+fdt_addr_t dev_get_reg(struct udevice *dev);
+
+/**
  * dev_get_addr() - Get the reg property of a device
  *
+ * The returned address value depends on a config options:
+ * Case 1: CONFIG_OF_TRANSLATE=y (default)
+ * Result: Make bus/child address space translation, that dependents on "ranges"
+ *         property.
+ *
+ * Case 2: CONFIG_OF_TRANSLATE is not set
+ * Result: Decode only device node's 'reg' property, without translation.
+ *
+ * Case 3: CONFIG_OF_TRANSLATE is not set; CONFIG_SIMPLE_BUS=y
+ * Result: When 'dev->parent' is a simple bus - then do the same as in case 1,
+ *         otherwise do the same as in case 2.
+ *
  * @dev: Pointer to a device
  *
  * @return addr
-- 
1.9.1