linux-kernel - [PATCH v3 08/10] soc: qcom: rpmpd: Add parent PD support

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Date:   Mon, 13 Mar 2023 21:00:06 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v3 08/10] soc: qcom: rpmpd: Add parent PD support

In some cases (like with the GPU core clock on GMU-less SoCs) it's
required that we scale more than one voltage domain. This can be achieved
by linking them in a parent-child relationship. Add support for specifying
a parent PD, similarly to what has been done in the RPMhPD driver.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/soc/qcom/rpmpd.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soc/qcom/rpmpd.c b/drivers/soc/qcom/rpmpd.c
index 946630d82b3d..2027c820caa7 100644
--- a/drivers/soc/qcom/rpmpd.c
+++ b/drivers/soc/qcom/rpmpd.c
@@ -48,6 +48,7 @@ struct rpmpd_req {
 
 struct rpmpd {
 	struct generic_pm_domain pd;
+	struct generic_pm_domain *parent;
 	struct rpmpd *peer;
 	const bool active_only;
 	unsigned int corner;
@@ -969,6 +970,15 @@ static int rpmpd_probe(struct platform_device *pdev)
 		data->domains[i] = &rpmpds[i]->pd;
 	}
 
+	/* Add subdomains */
+	for (i = 0; i < num; i++) {
+		if (!rpmpds[i])
+			continue;
+
+		if (rpmpds[i]->parent)
+			pm_genpd_add_subdomain(rpmpds[i]->parent, &rpmpds[i]->pd);
+	}
+
 	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 }
 

-- 
2.39.2