linux-kernel - [PATCH RFC v4 2/2] pmdomain: arm_scmi: add support for domain hierarchies

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Message-Id: <20251119-pmdomain-hierarchy-onecell-v4-2-f25a1d5022f8@baylibre.com>
Date: Wed, 19 Nov 2025 16:58:46 -0800
From: "Kevin Hilman (TI.com)" <khilman@...libre.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: devicetree@...r.kernel.org, linux-pm@...r.kernel.org, 
 arm-scmi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Kevin Hilman <khilman@...libre.com>
Subject: [PATCH RFC v4 2/2] pmdomain: arm_scmi: add support for domain
 hierarchies

After primary SCMI pmdomain is created, use new of_genpd helper to
check subdomain mappings, and create domain hierarchy.

Signed-off-by: Kevin Hilman (TI.com) <khilman@...libre.com>
---
 drivers/pmdomain/arm/scmi_pm_domain.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/pmdomain/arm/scmi_pm_domain.c b/drivers/pmdomain/arm/scmi_pm_domain.c
index 8fe1c0a501c9..a36bb50c7cf6 100644
--- a/drivers/pmdomain/arm/scmi_pm_domain.c
+++ b/drivers/pmdomain/arm/scmi_pm_domain.c
@@ -41,7 +41,7 @@ static int scmi_pd_power_off(struct generic_pm_domain *domain)
 
 static int scmi_pm_domain_probe(struct scmi_device *sdev)
 {
-	int num_domains, i;
+	int num_domains, i, ret;
 	struct device *dev = &sdev->dev;
 	struct device_node *np = dev->of_node;
 	struct scmi_pm_domain *scmi_pd;
@@ -110,7 +110,14 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev)
 
 	dev_set_drvdata(dev, scmi_pd_data);
 
-	return of_genpd_add_provider_onecell(np, scmi_pd_data);
+	ret = of_genpd_add_provider_onecell(np, scmi_pd_data);
+	if (ret)
+		return ret;
+
+	/* check for (optional) subdomain mapping with power-domain-map */
+	of_genpd_add_subdomain_map(np, scmi_pd_data);
+
+	return ret;
 }
 
 static void scmi_pm_domain_remove(struct scmi_device *sdev)

-- 
2.51.0