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authorLina Iyer <lina.iyer@linaro.org>2016-10-14 10:47:51 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-10-21 22:20:15 +0200
commit30f604283e05d34cb10108c7ba017e5f4fc9d62c (patch)
tree957fccac2026f12a7e4cc0cb2f45f5dfbd763d55 /drivers/base
parent405f7226014093a2809f27ba32a8230e770ac876 (diff)
PM / Domains: Allow domain power states to be read from DT
This patch allows domains to define idle states in the DT. SoC's can define domain idle states in DT using the "domain-idle-states" property of the domain provider. Add API to read the idle states from DT that can be set in the genpd object. This patch is based on the original patch by Marc Titinger. Signed-off-by: Marc Titinger <mtitinger+renesas@baylibre.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 37ab7f1ef178..9af75ba0472a 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1916,6 +1916,100 @@ out:
return ret ? -EPROBE_DEFER : 0;
}
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
+
+static const struct of_device_id idle_state_match[] = {
+ { .compatible = "arm,idle-state", },
+ { }
+};
+
+static int genpd_parse_state(struct genpd_power_state *genpd_state,
+ struct device_node *state_node)
+{
+ int err;
+ u32 residency;
+ u32 entry_latency, exit_latency;
+ const struct of_device_id *match_id;
+
+ match_id = of_match_node(idle_state_match, state_node);
+ if (!match_id)
+ return -EINVAL;
+
+ err = of_property_read_u32(state_node, "entry-latency-us",
+ &entry_latency);
+ if (err) {
+ pr_debug(" * %s missing entry-latency-us property\n",
+ state_node->full_name);
+ return -EINVAL;
+ }
+
+ err = of_property_read_u32(state_node, "exit-latency-us",
+ &exit_latency);
+ if (err) {
+ pr_debug(" * %s missing exit-latency-us property\n",
+ state_node->full_name);
+ return -EINVAL;
+ }
+
+ err = of_property_read_u32(state_node, "min-residency-us", &residency);
+ if (!err)
+ genpd_state->residency_ns = 1000 * residency;
+
+ genpd_state->power_on_latency_ns = 1000 * exit_latency;
+ genpd_state->power_off_latency_ns = 1000 * entry_latency;
+
+ return 0;
+}
+
+/**
+ * of_genpd_parse_idle_states: Return array of idle states for the genpd.
+ *
+ * @dn: The genpd device node
+ * @states: The pointer to which the state array will be saved.
+ * @n: The count of elements in the array returned from this function.
+ *
+ * Returns the device states parsed from the OF node. The memory for the states
+ * is allocated by this function and is the responsibility of the caller to
+ * free the memory after use.
+ */
+int of_genpd_parse_idle_states(struct device_node *dn,
+ struct genpd_power_state **states, int *n)
+{
+ struct genpd_power_state *st;
+ struct device_node *np;
+ int i = 0;
+ int err, ret;
+ int count;
+ struct of_phandle_iterator it;
+
+ count = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
+ if (!count)
+ return -EINVAL;
+
+ st = kcalloc(count, sizeof(*st), GFP_KERNEL);
+ if (!st)
+ return -ENOMEM;
+
+ /* Loop over the phandles until all the requested entry is found */
+ of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) {
+ np = it.node;
+ ret = genpd_parse_state(&st[i++], np);
+ if (ret) {
+ pr_err
+ ("Parsing idle state node %s failed with err %d\n",
+ np->full_name, ret);
+ of_node_put(np);
+ kfree(st);
+ return ret;
+ }
+ }
+
+ *n = count;
+ *states = st;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
+
#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */