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@gmail.com --- 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);