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authorRobin Murphy <robin.murphy@arm.com>2019-07-02 18:42:39 +0100
committerRob Herring <robh@kernel.org>2019-10-08 13:50:22 -0500
commitb68ac8dc22ebbf003e26e44bf4dd3030c076df5a (patch)
treed26b5be8ad883c6ca06698aa186bd11523df94ae /drivers
parentc60bf3eb888a362100aa1bdbea351dab681e262a (diff)
of: Factor out #{addr,size}-cells parsing
In some cases such as PCI host controllers, we may have a "parent bus" which is an OF leaf node, but still need to correctly parse ranges from the point of view of that bus. For that, factor out variants of the "#addr-cells" and "#size-cells" parsers which do not assume they have a device node and thus immediately traverse upwards before reading the relevant property. Signed-off-by: Robin Murphy <robin.murphy@arm.com> [robh: don't make of_bus_n_{addr,size}_cells() public] Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/of/address.c2
-rw-r--r--drivers/of/base.c32
-rw-r--r--drivers/of/of_private.h3
3 files changed, 27 insertions, 10 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 3fd34f7ad772..887c0413f648 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -14,6 +14,8 @@
#include <linux/slab.h>
#include <linux/string.h>
+#include "of_private.h"
+
/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS 4
#define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 1d667eb730e1..db7fbc0c0893 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -86,34 +86,46 @@ static bool __of_node_is_type(const struct device_node *np, const char *type)
return np && match && type && !strcmp(match, type);
}
-int of_n_addr_cells(struct device_node *np)
+int of_bus_n_addr_cells(struct device_node *np)
{
u32 cells;
- do {
- if (np->parent)
- np = np->parent;
+ for (; np; np = np->parent)
if (!of_property_read_u32(np, "#address-cells", &cells))
return cells;
- } while (np->parent);
+
/* No #address-cells property for the root node */
return OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
}
+
+int of_n_addr_cells(struct device_node *np)
+{
+ if (np->parent)
+ np = np->parent;
+
+ return of_bus_n_addr_cells(np);
+}
EXPORT_SYMBOL(of_n_addr_cells);
-int of_n_size_cells(struct device_node *np)
+int of_bus_n_size_cells(struct device_node *np)
{
u32 cells;
- do {
- if (np->parent)
- np = np->parent;
+ for (; np; np = np->parent)
if (!of_property_read_u32(np, "#size-cells", &cells))
return cells;
- } while (np->parent);
+
/* No #size-cells property for the root node */
return OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
}
+
+int of_n_size_cells(struct device_node *np)
+{
+ if (np->parent)
+ np = np->parent;
+
+ return of_bus_n_size_cells(np);
+}
EXPORT_SYMBOL(of_n_size_cells);
#ifdef CONFIG_NUMA
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index f8c58615c393..66294d29942a 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -158,6 +158,9 @@ extern void __of_sysfs_remove_bin_file(struct device_node *np,
#define for_each_transaction_entry_reverse(_oft, _te) \
list_for_each_entry_reverse(_te, &(_oft)->te_list, node)
+extern int of_bus_n_addr_cells(struct device_node *np);
+extern int of_bus_n_size_cells(struct device_node *np);
+
#ifdef CONFIG_OF_ADDRESS
extern int of_dma_get_range(struct device_node *np, u64 *dma_addr,
u64 *paddr, u64 *size);