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Tue, 10 Mar 2026 17:19:48 -0700 (PDT) From: "Kevin Hilman (TI)" Date: Tue, 10 Mar 2026 17:19:23 -0700 Subject: [PATCH 1/3] dt-bindings: power: Add power-domains-child-ids property Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260310-topic-lpm-pmdomain-child-ids-v1-1-5361687a18ff@baylibre.com> References: <20260310-topic-lpm-pmdomain-child-ids-v1-0-5361687a18ff@baylibre.com> In-Reply-To: <20260310-topic-lpm-pmdomain-child-ids-v1-0-5361687a18ff@baylibre.com> To: Ulf Hansson , Rob Herring Cc: Geert Uytterhoeven , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-Mailer: b4 0.15-dev-53144 X-Developer-Signature: v=1; a=openpgp-sha256; l=2801; i=khilman@baylibre.com; h=from:subject:message-id; bh=W4xSkkVIycg+yElDAfB07bsC758UPlh9LzCrHeiEG6A=; b=owEBbQKS/ZANAwAIAVk3GJrT+8ZlAcsmYgBpsLUi4DwekAQDifoz6ARcFx1D9uf8ysPKH/4U6 vky1ASsKDaJAjMEAAEIAB0WIQR7h0YOFpJ/qfW/8QxZNxia0/vGZQUCabC1IgAKCRBZNxia0/vG ZYGFEACckVcCs/uQxZ/ASYWG2Okj24RX8PZGa/Q2bO9XBt+1kSdS0YnC1imfvCon3WKPZ+5/lX8 K/h0jB3AX23jBP0sbB9ihDlFHl8NSt79A4R/Fj+RHLkHwqr6I3wJCBApPbhRbm51OWvPVocCUk7 BdUpZaFVX/YZ2mlmedt6g1t6uOA9GRgwMbn9vSXYCjrEa7fdf+/eojIBzgJGYstukKyehLvPvUR t1ULjrmjCBPrVdZqEb9NyKnX7vMjRqyZZ3qEJt/JqxrMHH89v49u9MVH1WoRvU7Yl2lrzpnAHhQ wwfvo1Avopvsy4jgjxfCUEEuo+SAwauxQ0PCM/TWNKZ7/xBYcoKgA25cy76nWua/oHzbpoBHJpV zbj6gF0AstTdZNcdiNXkLtZtHIJjBf9hA5Oz7C/9qpec+1lobL0fQLzrWfUYBFkqPXzdHLkpXBb xn4SyFKvv76YymCTBlQgHN+9+aa6SJs6XM37pa7Cl60LcddnLIyp57NwJlP3d78zjGDfYfTLSyF 3zxi0VrF4XO58kCZG6D+GxBSNfpeZPP8OLlugM2ftq1gzpDx3tSjHHcCUqpFSc8/IOsbVKACQgY /g7/SLGeKw1gZYKaSU4ZWi1Rxnn2ya8xY1KO5ioZ79wlrkBRuE7hx3GJ6w4HdXaG/4EakIz4O1S Em9fX2MDKctxdag== X-Developer-Key: i=khilman@baylibre.com; a=openpgp; fpr=7B87460E16927FA9F5BFF10C5937189AD3FBC665 Add binding documentation for the new power-domains-child-ids property, which works in conjunction with the existing power-domains property to establish parent-child relationships between a multi-domain power domain provider and external parent domains. Each element in the uint32 array identifies the child domain ID (index) within the provider that should be made a child domain of the corresponding phandle entry in power-domains. The two arrays must have the same number of elements. Signed-off-by: Kevin Hilman (TI) Reviewed-by: Rob Herring (Arm) --- Documentation/devicetree/bindings/power/power-domain.yaml | 35 +++++++++++= ++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/Documentation/devicetree/bindings/power/power-domain.yaml b/Do= cumentation/devicetree/bindings/power/power-domain.yaml index b1147dbf2e73..a3d2af124d37 100644 --- a/Documentation/devicetree/bindings/power/power-domain.yaml +++ b/Documentation/devicetree/bindings/power/power-domain.yaml @@ -68,6 +68,21 @@ properties: by the given provider should be subdomains of the domain specified by this binding. =20 + power-domains-child-ids: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: + An array of child domain IDs that correspond to the power-domains + property. This property is only applicable to power domain providers + with "#power-domain-cells" > 0 (i.e., providers that supply multiple + power domains). It specifies which of the provider's child domains + should be associated with each parent domain listed in the power-dom= ains + property. The number of elements in this array must match the number= of + phandles in the power-domains property. Each element specifies the c= hild + domain ID (index) that should be made a child domain of the correspo= nding + parent domain. This enables hierarchical power domain structures whe= re + different child domains from the same provider can have different + parent domains. + required: - "#power-domain-cells" =20 @@ -133,3 +148,23 @@ examples: min-residency-us =3D <7000>; }; }; + + - | + // Example: SCMI domain 15 -> MAIN_PD, SCMI domain 19 -> WKUP_PD + MAIN_PD: power-controller-main { + compatible =3D "foo,power-controller"; + #power-domain-cells =3D <0>; + }; + + WKUP_PD: power-controller-wkup { + compatible =3D "foo,power-controller"; + #power-domain-cells =3D <0>; + }; + + scmi_pds: protocol@11 { + compatible =3D "foo,power-controller"; + reg =3D <0x11>; + #power-domain-cells =3D <1>; + power-domains =3D <&MAIN_PD>, <&WKUP_PD>; + power-domains-child-ids =3D <15>, <19>; + }; --=20 2.51.0 From nobody Wed Apr 8 04:42:28 2026 Received: from mail-pf1-f173.google.com (mail-pf1-f173.google.com [209.85.210.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6594F317144 for ; 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Tue, 10 Mar 2026 17:19:49 -0700 (PDT) Received: from localhost ([71.212.200.220]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829f6dc2b34sm453256b3a.3.2026.03.10.17.19.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Mar 2026 17:19:49 -0700 (PDT) From: "Kevin Hilman (TI)" Date: Tue, 10 Mar 2026 17:19:24 -0700 Subject: [PATCH 2/3] pmdomain: core: add support for power-domains-child-ids Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260310-topic-lpm-pmdomain-child-ids-v1-2-5361687a18ff@baylibre.com> References: <20260310-topic-lpm-pmdomain-child-ids-v1-0-5361687a18ff@baylibre.com> In-Reply-To: <20260310-topic-lpm-pmdomain-child-ids-v1-0-5361687a18ff@baylibre.com> To: Ulf Hansson , Rob Herring Cc: Geert Uytterhoeven , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-Mailer: b4 0.15-dev-53144 X-Developer-Signature: v=1; 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a=openpgp; fpr=7B87460E16927FA9F5BFF10C5937189AD3FBC665 Currently, PM domains can only support hierarchy for simple providers (e.g. ones with #power-domain-cells =3D 0). Add support for oncell providers as well by adding a new property `power-domains-child-ids` to describe the parent/child relationship. For example, an SCMI PM domain provider has multiple domains, each of which might be a child of diffeent parent domains. In this example, the parent domains are MAIN_PD and WKUP_PD: scmi_pds: protocol@11 { reg =3D <0x11>; #power-domain-cells =3D <1>; power-domains =3D <&MAIN_PD>, <&WKUP_PD>; power-domains-child-ids =3D <15>, <19>; }; With this example using the new property, SCMI PM domain 15 becomes a child domain of MAIN_PD, and SCMI domain 19 becomes a child domain of WKUP_PD. To support this feature, add two new core functions - of_genpd_add_child_ids() - of_genpd_remove_child_ids() which can be called by pmdomain providers to add/remove child domains if they support the new property power-domains-child-ids. Signed-off-by: Kevin Hilman (TI) Tested-by: Dhruva Gole --- drivers/pmdomain/core.c | 169 ++++++++++++++++++++++++++++++++++++++++++= +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++= ++++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 16 ++++++++++++++++ 2 files changed, 185 insertions(+) diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index 61c2277c9ce3..acb45dd540b7 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -2909,6 +2909,175 @@ static struct generic_pm_domain *genpd_get_from_pro= vider( return genpd; } =20 +/** + * of_genpd_add_child_ids() - Parse power-domains-child-ids property + * @np: Device node pointer associated with the PM domain provider. + * @data: Pointer to the onecell data associated with the PM domain provid= er. + * + * Parse the power-domains and power-domains-child-ids properties to estab= lish + * parent-child relationships for PM domains. The power-domains property l= ists + * parent domains, and power-domains-child-ids lists which child domain IDs + * should be associated with each parent. + * + * Returns 0 on success, -ENOENT if properties don't exist, or negative er= ror code. + */ +int of_genpd_add_child_ids(struct device_node *np, + struct genpd_onecell_data *data) +{ + struct of_phandle_args parent_args; + struct generic_pm_domain *parent_genpd, *child_genpd; + struct of_phandle_iterator it; + const struct property *prop; + const __be32 *item; + u32 child_id; + int ret; + + /* Check if both properties exist */ + if (of_count_phandle_with_args(np, "power-domains", "#power-domain-cells"= ) <=3D 0) + return -ENOENT; + + prop =3D of_find_property(np, "power-domains-child-ids", NULL); + if (!prop) + return -ENOENT; + + item =3D of_prop_next_u32(prop, NULL, &child_id); + + /* Iterate over power-domains phandles and power-domains-child-ids in loc= kstep */ + of_for_each_phandle(&it, ret, np, "power-domains", "#power-domain-cells",= 0) { + if (!item) { + pr_err("power-domains-child-ids shorter than power-domains for %pOF\n",= np); + ret =3D -EINVAL; + goto err_put_node; + } + + /* + * Fill parent_args from the iterator. it.node is released by + * the next of_phandle_iterator_next() call at the top of the + * loop, or by the of_node_put() on the error path below. + */ + parent_args.np =3D it.node; + parent_args.args_count =3D of_phandle_iterator_args(&it, parent_args.arg= s, + MAX_PHANDLE_ARGS); + + /* Get the parent domain */ + parent_genpd =3D genpd_get_from_provider(&parent_args); + if (IS_ERR(parent_genpd)) { + pr_err("Failed to get parent domain for %pOF: %ld\n", + np, PTR_ERR(parent_genpd)); + ret =3D PTR_ERR(parent_genpd); + goto err_put_node; + } + + /* Validate child ID is within bounds */ + if (child_id >=3D data->num_domains) { + pr_err("Child ID %u out of bounds (max %u) for %pOF\n", + child_id, data->num_domains - 1, np); + ret =3D -EINVAL; + goto err_put_node; + } + + /* Get the child domain */ + child_genpd =3D data->domains[child_id]; + if (!child_genpd) { + pr_err("Child domain %u is NULL for %pOF\n", child_id, np); + ret =3D -EINVAL; + goto err_put_node; + } + + /* Establish parent-child relationship */ + ret =3D genpd_add_subdomain(parent_genpd, child_genpd); + if (ret) { + pr_err("Failed to add child domain %u to parent in %pOF: %d\n", + child_id, np, ret); + goto err_put_node; + } + + pr_debug("Added child domain %u (%s) to parent %s for %pOF\n", + child_id, child_genpd->name, parent_genpd->name, np); + + item =3D of_prop_next_u32(prop, item, &child_id); + } + + /* of_for_each_phandle returns -ENOENT at natural end-of-list */ + if (ret && ret !=3D -ENOENT) + return ret; + + /* All power-domains phandles were consumed; check for trailing child IDs= */ + if (item) { + pr_err("power-domains-child-ids longer than power-domains for %pOF\n", n= p); + return -EINVAL; + } + + return 0; + +err_put_node: + of_node_put(it.node); + return ret; +} +EXPORT_SYMBOL_GPL(of_genpd_add_child_ids); + +/** + * of_genpd_remove_child_ids() - Remove parent-child PM domain relationshi= ps + * @np: Device node pointer associated with the PM domain provider. + * @data: Pointer to the onecell data associated with the PM domain provid= er. + * + * Reverses the effect of of_genpd_add_child_ids() by parsing the same + * power-domains and power-domains-child-ids properties and calling + * pm_genpd_remove_subdomain() for each established relationship. + * + * Returns 0 on success, -ENOENT if properties don't exist, or negative er= ror + * code on failure. + */ +int of_genpd_remove_child_ids(struct device_node *np, + struct genpd_onecell_data *data) +{ + struct of_phandle_args parent_args; + struct generic_pm_domain *parent_genpd, *child_genpd; + struct of_phandle_iterator it; + const struct property *prop; + const __be32 *item; + u32 child_id; + int ret; + + /* Check if both properties exist */ + if (of_count_phandle_with_args(np, "power-domains", "#power-domain-cells"= ) <=3D 0) + return -ENOENT; + + prop =3D of_find_property(np, "power-domains-child-ids", NULL); + if (!prop) + return -ENOENT; + + item =3D of_prop_next_u32(prop, NULL, &child_id); + + of_for_each_phandle(&it, ret, np, "power-domains", "#power-domain-cells",= 0) { + if (!item) + break; + + parent_args.np =3D it.node; + parent_args.args_count =3D of_phandle_iterator_args(&it, parent_args.arg= s, + MAX_PHANDLE_ARGS); + + if (child_id >=3D data->num_domains || !data->domains[child_id]) { + item =3D of_prop_next_u32(prop, item, &child_id); + continue; + } + + parent_genpd =3D genpd_get_from_provider(&parent_args); + if (IS_ERR(parent_genpd)) { + item =3D of_prop_next_u32(prop, item, &child_id); + continue; + } + + child_genpd =3D data->domains[child_id]; + pm_genpd_remove_subdomain(parent_genpd, child_genpd); + + item =3D of_prop_next_u32(prop, item, &child_id); + } + + return (ret =3D=3D -ENOENT) ? 0 : ret; +} +EXPORT_SYMBOL_GPL(of_genpd_remove_child_ids); + /** * of_genpd_add_device() - Add a device to an I/O PM domain * @genpdspec: OF phandle args to use for look-up PM domain diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index f67a2cb7d781..b44615d79af6 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -465,6 +465,10 @@ struct generic_pm_domain *of_genpd_remove_last(struct = device_node *np); int of_genpd_parse_idle_states(struct device_node *dn, struct genpd_power_state **states, int *n); void of_genpd_sync_state(struct device_node *np); +int of_genpd_add_child_ids(struct device_node *np, + struct genpd_onecell_data *data); +int of_genpd_remove_child_ids(struct device_node *np, + struct genpd_onecell_data *data); =20 int genpd_dev_pm_attach(struct device *dev); struct device *genpd_dev_pm_attach_by_id(struct device *dev, @@ -534,6 +538,18 @@ struct generic_pm_domain *of_genpd_remove_last(struct = device_node *np) { return ERR_PTR(-EOPNOTSUPP); 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a=openpgp; fpr=7B87460E16927FA9F5BFF10C5937189AD3FBC665 After primary SCMI pmdomain is created, use new of_genpd helper which checks for child domain mappings defined in power-domains-child-ids. Also remove any child domain mappings when SCMI domain is removed. Signed-off-by: Kevin Hilman (TI) Tested-by: Dhruva Gole --- drivers/pmdomain/arm/scmi_pm_domain.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/pmdomain/arm/scmi_pm_domain.c b/drivers/pmdomain/arm/s= cmi_pm_domain.c index b5e2ffd5ea64..9d8faef44aa9 100644 --- a/drivers/pmdomain/arm/scmi_pm_domain.c +++ b/drivers/pmdomain/arm/scmi_pm_domain.c @@ -114,6 +114,14 @@ static int scmi_pm_domain_probe(struct scmi_device *sd= ev) =20 dev_set_drvdata(dev, scmi_pd_data); =20 + /* + * Parse (optional) power-domains-child-ids property to + * establish parent-child relationships + */ + ret =3D of_genpd_add_child_ids(np, scmi_pd_data); + if (ret < 0 && ret !=3D -ENOENT) + pr_err("Failed to parse power-domains-child-ids for %pOF: %d\n", np, ret= ); + return 0; err_rm_genpds: for (i =3D num_domains - 1; i >=3D 0; i--) @@ -129,9 +137,13 @@ static void scmi_pm_domain_remove(struct scmi_device *= sdev) struct device *dev =3D &sdev->dev; struct device_node *np =3D dev->of_node; =20 + scmi_pd_data =3D dev_get_drvdata(dev); + + /* Remove any parent-child relationships established at probe time */ + of_genpd_remove_child_ids(np, scmi_pd_data); + of_genpd_del_provider(np); =20 - scmi_pd_data =3D dev_get_drvdata(dev); for (i =3D 0; i < scmi_pd_data->num_domains; i++) { if (!scmi_pd_data->domains[i]) continue; --=20 2.51.0