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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-01-02 14:25:27 +0300
committerWill Deacon <will.deacon@arm.com>2018-01-02 19:43:12 +0300
commita0e71cd9b1a0195f96500b2268759873ff8ff819 (patch)
tree217c27009dd080b9b6e04a3a9829c13b3e25eb37 /include/linux/of.h
parent82975c46da8275a2a212cd94049bbef9bb961da2 (diff)
downloadlinux-a0e71cd9b1a0195f96500b2268759873ff8ff819.tar.xz
of: Add helper for mapping device node to logical CPU number
Add a helper to map a device node to a logical CPU number to avoid duplication. Currently this is open coded in different places (e.g gic-v3, coresight). The helper tries to map device node to a "possible" logical CPU id, which may not be online yet. It is the responsibility of the user to make sure that the CPU is online. The helper uses of_cpu_device_node_get() to retrieve the device node for a given CPU (which uses per_cpu data if available else falls back to slower of_get_cpu_node()). Cc: devicetree@vger.kernel.org Cc: Frank Rowand <frowand.list@gmail.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include/linux/of.h')
-rw-r--r--include/linux/of.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h
index d3dea1d1e3a9..173102dafb07 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -544,6 +544,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
bool of_console_check(struct device_node *dn, char *name, int index);
+extern int of_cpu_node_to_id(struct device_node *np);
+
#else /* CONFIG_OF */
static inline void of_core_init(void)
@@ -916,6 +918,11 @@ static inline void of_property_clear_flag(struct property *p, unsigned long flag
{
}
+static inline int of_cpu_node_to_id(struct device_node *np)
+{
+ return -ENODEV;
+}
+
#define of_match_ptr(_ptr) NULL
#define of_match_node(_matches, _node) NULL
#endif /* CONFIG_OF */