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| author | Ulf Hansson <ulf.hansson@linaro.org> | 2019-10-10 12:01:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-13 18:18:10 +0100 |
| commit | d786067be2ebb81e5e3d4fad2578435b05e5c4c7 (patch) | |
| tree | 1491579f78b9abfeee7a87f127685f9a33319dcb /include | |
| parent | 13f27a05377dad9a146d1e05295a768fb9830eb5 (diff) | |
of: base: Add of_get_cpu_state_node() to get idle states for a CPU node
[ Upstream commit b9f8c26afc405a4a616e765e949bdd551151e41d ]
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>
Stable-dep-of: d79972789d17 ("of: dynamic: Fix of_reconfig_get_state_change() return value documentation")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/of.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h index a7621e2b440a..e29b341598e9 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; |