linux-kernel - [PATCH RFC v5 2/2] pmdomain: arm_scmi: add support for domain hierarchies

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Message-Id: <20260122-pmdomain-hierarchy-onecell-v5-2-76855ec856bd@baylibre.com>
Date: Thu, 22 Jan 2026 17:14:01 -0800
From: "Kevin Hilman (TI)" <khilman@...libre.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: devicetree@...r.kernel.org, linux-pm@...r.kernel.org, 
 arm-scmi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org
Subject: [PATCH RFC v5 2/2] pmdomain: arm_scmi: add support for domain
 hierarchies

After primary SCMI pmdomain is created, use new of_genpd helper to
check if there are any child domain mappings defined by
power-domain-map, and create domain hierarchy.  Also remove any child
domain mappings when SCMI domain is removed.

Signed-off-by: Kevin Hilman (TI) <khilman@...libre.com>
---
 drivers/pmdomain/arm/scmi_pm_domain.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pmdomain/arm/scmi_pm_domain.c b/drivers/pmdomain/arm/scmi_pm_domain.c
index b5e2ffd5ea64..a52387c45d88 100644
--- a/drivers/pmdomain/arm/scmi_pm_domain.c
+++ b/drivers/pmdomain/arm/scmi_pm_domain.c
@@ -114,8 +114,12 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev)

 	dev_set_drvdata(dev, scmi_pd_data);

+	/* check for (optional) subdomain mapping with power-domain-map */
+	of_genpd_add_subdomain_map(np, scmi_pd_data);
+
 	return 0;
 err_rm_genpds:
+	of_genpd_remove_subdomain_map(np, scmi_pd_data);
 	for (i = num_domains - 1; i >= 0; i--)
 		pm_genpd_remove(domains[i]);

@@ -132,6 +136,7 @@ static void scmi_pm_domain_remove(struct scmi_device *sdev)
 	of_genpd_del_provider(np);

 	scmi_pd_data = dev_get_drvdata(dev);
+	of_genpd_remove_subdomain_map(np, scmi_pd_data);
 	for (i = 0; i < scmi_pd_data->num_domains; i++) {
 		if (!scmi_pd_data->domains[i])
 			continue;

-- 
2.51.0