[PATCH v4 6/6] soc/tegra: pmc: Link children power domains to the parent domain
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-03-14 16:49:15
Also in:
linux-devicetree, linux-pm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 a PMC domain. Tested-by: Peter Geis <redacted> # Ouya T30 Tested-by: Paul Fertser <fercerpav@gmail.com> # PAZ00 T20 Tested-by: Nicolas Chauvet <redacted> # PAZ00 T20 and TK1 T124 Tested-by: Matt Merhar <redacted> # Ouya T30 Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/soc/tegra/pmc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 84ab27d85d92..ba8407819397 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c@@ -1283,6 +1283,7 @@ 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;
@@ -1296,6 +1297,21 @@ 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) { + of_node_put(child); + break; + } } of_node_put(np);
--
2.30.2