linux-kernel - [PATCH 1/7] soc: qcom: rpmpd: Add parent PD support

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Date:   Wed, 25 Jan 2023 04:27:22 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     marijn.suijten@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] 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 337b1ad1cd3b..0c2d930ab38f 100644
--- a/drivers/soc/qcom/rpmpd.c
+++ b/drivers/soc/qcom/rpmpd.c
@@ -99,6 +99,7 @@ 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;
@@ -673,6 +674,15 @@ 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);
 }
 
-- 
2.39.1