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Fri, 17 Jan 2025 05:54:12 -0800 (PST) From: Bryan O'Donoghue Date: Fri, 17 Jan 2025 13:54:10 +0000 Subject: [PATCH v10 4/4] clk: qcom: Support attaching GDSCs to multiple parents 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: <20250117-b4-linux-next-24-11-18-clock-multiple-power-domains-v10-4-13f2bb656dad@linaro.org> References: <20250117-b4-linux-next-24-11-18-clock-multiple-power-domains-v10-0-13f2bb656dad@linaro.org> In-Reply-To: <20250117-b4-linux-next-24-11-18-clock-multiple-power-domains-v10-0-13f2bb656dad@linaro.org> To: Bjorn Andersson , Michael Turquette , Stephen Boyd , Dmitry Baryshkov , Vladimir Zapolskiy , Rajendra Nayak Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Bryan O'Donoghue X-Mailer: b4 0.15-dev-1b0d6 When a clock-controller lists multiple power-domains we need make each GDSC= a subdomain of each of the clock-controller's listed power-domains. GDSCs without an explicitly defined parent should be a subdomain of each of the clock-controller's listed power-domains. GDSCs with an explicitly defined parent should attach only to the parent GDSC and not the listed power-domains. Any votes will trickle through the hierarchy up to the external power-domains. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D :: arch/arm64/boot/dts/example.dtsi :: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D clockcc: clock-controller@0 { compat =3D"qcom,example-clockcc"; power-domains =3D <&pd_a, &pd_b>; } =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D :: drivers/clk/qcom/example-clockcc.c :: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D static struct gdsc parent_gdsc =3D { .pd =3D { .name =3D "parent_gdsc", }, }; static struct gdsc child0_gdsc =3D { .pd =3D { .name =3D "child0_gdsc", }, .parent =3D &parent_gdsc.pd, }; static struct gdsc child1_gdsc =3D { .pd =3D { .name =3D "child1_gdsc", }, .parent =3D &parent_gdsc.pd, }; =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D :: power-subdomains :: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D pm-domain::pd_a =E2=94=94=E2=94=80=E2=94=80 pm-subdomain::clockcc::parent_gdsc =E2=94=9C=E2=94=80=E2=94=80 pm-subdomain::clockcc::child0_gdsc =E2=94=94=E2=94=80=E2=94=80 pm-subdomain::clockcc::child1_gdsc pm-domain::pd_b =E2=94=94=E2=94=80=E2=94=80 pm-subdomain::clockcc::parent_gdsc =E2=94=9C=E2=94=80=E2=94=80 pm-subdomain::clockcc::child1_gdsc =E2=94=94=E2=94=80=E2=94=80 pm-subdomain::clockcc::child2_gdsc The performance states will percolate through the pm-domain hierarchy to the domains that handle the relevant states. Signed-off-by: Bryan O'Donoghue --- drivers/clk/qcom/common.c | 1 + drivers/clk/qcom/gdsc.c | 35 +++++++++++++++++++++++++++++++++++ drivers/clk/qcom/gdsc.h | 1 + 3 files changed, 37 insertions(+) diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c index b79e6a73b53a4113ca324d102d7be5504a9fe85e..9e3380fd718198c9fe63d736161= 5a91c3ecb3d60 100644 --- a/drivers/clk/qcom/common.c +++ b/drivers/clk/qcom/common.c @@ -323,6 +323,7 @@ int qcom_cc_really_probe(struct device *dev, scd->dev =3D dev; scd->scs =3D desc->gdscs; scd->num =3D desc->num_gdscs; + scd->pd_list =3D cc->pd_list; ret =3D gdsc_register(scd, &reset->rcdev, regmap); if (ret) return ret; diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index fdedf6dfe7b90c074b200353fc0c2b897863c79f..7687661491f1fd5a3076c839c4f= 70f430783fc51 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -506,6 +506,36 @@ static int gdsc_init(struct gdsc *sc) return ret; } =20 +static int gdsc_add_subdomain_list(struct dev_pm_domain_list *pd_list, + struct generic_pm_domain *subdomain) +{ + int i, ret; + + for (i =3D 0; i < pd_list->num_pds; i++) { + struct device *dev =3D pd_list->pd_devs[i]; + struct generic_pm_domain *genpd =3D pd_to_genpd(dev->pm_domain); + + ret =3D pm_genpd_add_subdomain(genpd, subdomain); + if (ret) + return ret; + } + + return 0; +} + +static void gdsc_remove_subdomain_list(struct dev_pm_domain_list *pd_list, + struct generic_pm_domain *subdomain) +{ + int i; + + for (i =3D 0; i < pd_list->num_pds; i++) { + struct device *dev =3D pd_list->pd_devs[i]; + struct generic_pm_domain *genpd =3D pd_to_genpd(dev->pm_domain); + + pm_genpd_remove_subdomain(genpd, subdomain); + } +} + static void gdsc_pm_subdomain_remove(struct gdsc_desc *desc, size_t num) { struct device *dev =3D desc->dev; @@ -520,6 +550,8 @@ static void gdsc_pm_subdomain_remove(struct gdsc_desc *= desc, size_t num) pm_genpd_remove_subdomain(scs[i]->parent, &scs[i]->pd); else if (!IS_ERR_OR_NULL(dev->pm_domain)) pm_genpd_remove_subdomain(pd_to_genpd(dev->pm_domain), &scs[i]->pd); + else if (desc->pd_list) + gdsc_remove_subdomain_list(desc->pd_list, &scs[i]->pd); } } =20 @@ -575,6 +607,9 @@ int gdsc_register(struct gdsc_desc *desc, ret =3D pm_genpd_add_subdomain(scs[i]->parent, &scs[i]->pd); else if (!IS_ERR_OR_NULL(dev->pm_domain)) ret =3D pm_genpd_add_subdomain(pd_to_genpd(dev->pm_domain), &scs[i]->pd= ); + else if (desc->pd_list) + ret =3D gdsc_add_subdomain_list(desc->pd_list, &scs[i]->pd); + if (ret) goto err_pm_subdomain_remove; } diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h index 1e2779b823d1c8ca077c9b4cd0a0dbdf5f9457ef..dd843e86c05b2f30e6d9e978681= 580016333839d 100644 --- a/drivers/clk/qcom/gdsc.h +++ b/drivers/clk/qcom/gdsc.h @@ -80,6 +80,7 @@ struct gdsc_desc { struct device *dev; struct gdsc **scs; size_t num; + struct dev_pm_domain_list *pd_list; }; =20 #ifdef CONFIG_QCOM_GDSC --=20 2.47.1