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authorUlf Hansson <ulf.hansson@linaro.org>2019-10-10 12:01:48 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2020-01-02 16:50:04 +0100
commitb9f8c26afc405a4a616e765e949bdd551151e41d (patch)
tree4b389419d211106cbcbd1aad082bb4d86dc84dec /include/linux/of.h
parent49fdcd7577efe9efe863cdbb154f32a96970c1bc (diff)
of: base: Add of_get_cpu_state_node() to get idle states for a CPU node
The CPU's idle state nodes are currently parsed at the common cpuidle DT library, but also when initializing data for specific CPU idle operations, as in the PSCI cpuidle driver case and qcom-spm cpuidle case. To avoid open-coding, let's introduce of_get_cpu_state_node(), which takes the device node for the CPU and the index to the requested idle state node, as in-parameters. In case a corresponding idle state node is found, it returns the node with the refcount incremented for it, else it returns NULL. Moreover, for PSCI there are two options to describe the CPU's idle states [1], either via a flattened description or a hierarchical layout. Hence, let's take both options into account. [1] Documentation/devicetree/bindings/arm/psci.yaml Suggested-by: Sudeep Holla <sudeep.holla@arm.com> Co-developed-by: Lina Iyer <lina.iyer@linaro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'include/linux/of.h')
-rw-r--r--include/linux/of.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h
index 844f89e1b039..c669c0a4732f 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -351,6 +351,8 @@ extern const void *of_get_property(const struct device_node *node,
int *lenp);
extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
extern struct device_node *of_get_next_cpu_node(struct device_node *prev);
+extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
+ int index);
#define for_each_property_of_node(dn, pp) \
for (pp = dn->properties; pp != NULL; pp = pp->next)
@@ -765,6 +767,12 @@ static inline struct device_node *of_get_next_cpu_node(struct device_node *prev)
return NULL;
}
+static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
+ int index)
+{
+ return NULL;
+}
+
static inline int of_n_addr_cells(struct device_node *np)
{
return 0;