The Core domain is a parent of PMC power domains, hence PMC domains
should be set up as a sub-domains of the parent (Core) domain if
"power-domains" phandle presents in a device-tree node of PMC domain.
This allows to propagate GENPD performance changes to the parent Core
domain if performance change is applied to PMC domain.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/soc/tegra/pmc.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 4f96dc7745c4..1a659d1c06d7 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1236,6 +1236,7 @@ static int tegra_powergate_add(struct tegra_pmc *pmc, struct device_node *np)
static int tegra_powergate_init(struct tegra_pmc *pmc,
struct device_node *parent)
{
+ struct of_phandle_args child_args, parent_args;
struct device_node *np, *child;
int err = 0;
@@ -1249,6 +1250,24 @@ static int tegra_powergate_init(struct tegra_pmc *pmc,
of_node_put(child);
break;
}
+
+ if (of_parse_phandle_with_args(child, "power-domains",
+ "#power-domain-cells",
+ 0, &parent_args))
+ continue;
+
+ child_args.np = child;
+ child_args.args_count = 0;
+
+ err = of_genpd_add_subdomain(&parent_args, &child_args);
+ of_node_put(parent_args.np);
+ if (err) {
+ if (err == -ENOENT)
+ err = -EPROBE_DEFER;
+
+ of_node_put(child);
+ break;
+ }
}
of_node_put(np);
--
2.29.2
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