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authorStephen Warren <swarren@nvidia.com>2012-07-26 03:34:37 +0400
committerRob Herring <rob.herring@calxeda.com>2012-08-03 17:01:46 +0400
commit5d61b165c892853f2daf6220d2ec6577487e273a (patch)
tree3bcff9b185383c768b702461c1194cb8eb9d0002 /drivers/of/platform.c
parent0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (diff)
downloadlinux-5d61b165c892853f2daf6220d2ec6577487e273a.tar.xz
of: Allow busses with #size-cells=0
It's quite legitimate for a DT node to specify #size-cells=0. One example is a node that's used to collect a number of non-memory-mapped devices. In that scenario, there may be multiple child nodes with the same name (type) thus necessitating the use of unit addresses in node names, and reg properties: / { regulators { compatible = "simple-bus"; #address-cells = <1>; #size-cells = <0>; regulator@0 { compatible = "regulator-fixed"; reg = <0>; ... }; regulator@1 { compatible = "regulator-fixed"; reg = <1>; ... }; ... }; }; However, #size-cells=0 prevents translation of reg property values into the parent node's address space. In turn, this triggers the kernel to emit error messages during boot, such as: prom_parse: Bad cell count for /regulators/regulator@0 To prevent printing these error messages for legitimate DT content, a number of changes are made: 1) of_get_address()/of_get_pci_address() are modified only to validate the value of #address-cells, and not #size-cells. 2) of_can_translate_address() is added to indicate whether address translation is possible. 3) of_device_make_bus_id() is modified to name devices based on the translated address only where possible, and otherwise fall back to using the (first cell of the) raw untranslated address. 4) of_device_alloc() is modified to create memory resources for a device only if the address can be translated into the CPU's address space. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Diffstat (limited to 'drivers/of/platform.c')
-rw-r--r--drivers/of/platform.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index e44f8c2d239d..9bdeaf30b17d 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -78,6 +78,7 @@ void of_device_make_bus_id(struct device *dev)
struct device_node *node = dev->of_node;
const u32 *reg;
u64 addr;
+ const __be32 *addrp;
int magic;
#ifdef CONFIG_PPC_DCR
@@ -105,7 +106,15 @@ void of_device_make_bus_id(struct device *dev)
*/
reg = of_get_property(node, "reg", NULL);
if (reg) {
- addr = of_translate_address(node, reg);
+ if (of_can_translate_address(node)) {
+ addr = of_translate_address(node, reg);
+ } else {
+ addrp = of_get_address(node, 0, NULL, NULL);
+ if (addrp)
+ addr = of_read_number(addrp, 1);
+ else
+ addr = OF_BAD_ADDR;
+ }
if (addr != OF_BAD_ADDR) {
dev_set_name(dev, "%llx.%s",
(unsigned long long)addr, node->name);
@@ -140,8 +149,9 @@ struct platform_device *of_device_alloc(struct device_node *np,
return NULL;
/* count the io and irq resources */
- while (of_address_to_resource(np, num_reg, &temp_res) == 0)
- num_reg++;
+ if (of_can_translate_address(np))
+ while (of_address_to_resource(np, num_reg, &temp_res) == 0)
+ num_reg++;
num_irq = of_irq_count(np);
/* Populate the resource table */