linux-kernel - [PATCH 2/5] interconnect: qcom: icc-rpmh: Get parent's regmap for nested NoCs

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Message-Id: <20251107-sm6350-icc-qos-v1-2-8275e5fc3f61@fairphone.com>
Date: Fri, 07 Nov 2025 17:08:48 +0100
From: Luca Weiss <luca.weiss@...rphone.com>
To: Georgi Djakov <djakov@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 2/5] interconnect: qcom: icc-rpmh: Get parent's regmap for
 nested NoCs

Since commit 57eb14779dfd ("interconnect: qcom: icc-rpmh: Support child
NoC device probe") the icc-rpmh driver supports initializing child NoCs,
but those child NoCs also need to be able to get the parent's regmap in
order to enable QoS.

Change the driver to support that and support programming QoS register.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
 drivers/interconnect/qcom/icc-rpmh.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
index f90c29111f48..2103185a44a5 100644
--- a/drivers/interconnect/qcom/icc-rpmh.c
+++ b/drivers/interconnect/qcom/icc-rpmh.c
@@ -308,7 +308,16 @@ int qcom_icc_rpmh_probe(struct platform_device *pdev)
 		struct resource *res;
 		void __iomem *base;
 
-		base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		if (!res) {
+			/* Try parent's regmap */
+			qp->regmap = dev_get_regmap(dev->parent, NULL);
+			if (qp->regmap)
+				goto regmap_done;
+			goto skip_qos_config;
+		}
+
+		base = devm_ioremap_resource(dev, res);
 		if (IS_ERR(base))
 			goto skip_qos_config;
 
@@ -318,6 +327,7 @@ int qcom_icc_rpmh_probe(struct platform_device *pdev)
 			goto skip_qos_config;
 		}
 
+regmap_done:
 		qp->num_clks = devm_clk_bulk_get_all(qp->dev, &qp->clks);
 		if (qp->num_clks == -EPROBE_DEFER)
 			return dev_err_probe(dev, qp->num_clks, "Failed to get QoS clocks\n");

-- 
2.51.2