From b68ac8dc22ebbf003e26e44bf4dd3030c076df5a Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Tue, 2 Jul 2019 18:42:39 +0100 Subject: [PATCH] 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 [robh: don't make of_bus_n_{addr,size}_cells() public] Reviewed-by: Geert Uytterhoeven Tested-by: Nicolas Saenz Julienne Reviewed-by: Nicolas Saenz Julienne Signed-off-by: Rob Herring --- drivers/of/address.c | 2 ++ drivers/of/base.c | 32 ++++++++++++++++++++++---------- drivers/of/of_private.h | 3 +++ 3 files changed, 27 insertions(+), 10 deletions(-) diff --git a/drivers/of/address.c b/drivers/of/address.c index 3fd34f7..887c041 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -14,6 +14,8 @@ #include #include +#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 1d667eb..db7fbc0 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 f8c5861..66294d2 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); -- 2.7.4