linux-kernel - [PATCH v2 05/12] soc: qcom: geni-se: Introduce helper API for attaching power domains

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Message-Id: <20251229045446.3227667-6-praveen.talari@oss.qualcomm.com>
Date: Mon, 29 Dec 2025 10:24:39 +0530
From: Praveen Talari <praveen.talari@....qualcomm.com>
To: Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mukesh Kumar Savaliya <mukesh.savaliya@....qualcomm.com>,
        Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Praveen Talari <praveen.talari@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        alexey.klimov@...aro.org, krzk@...nel.org, bryan.odonoghue@...aro.org,
        jorge.ramirez@....qualcomm.com, dmitry.baryshkov@....qualcomm.com
Cc: psodagud@...cinc.com, djaggi@...cinc.com, quic_msavaliy@...cinc.com,
        quic_vtanuku@...cinc.com, quic_arandive@...cinc.com,
        quic_shazhuss@...cinc.com, quic_cchiluve@...cinc.com
Subject: [PATCH v2 05/12] soc: qcom: geni-se: Introduce helper API for attaching power domains

The GENI Serial Engine drivers (I2C, SPI, and SERIAL) currently handle
the attachment of power domains. This often leads to duplicated code
logic across different driver probe functions.

Introduce a new helper API, geni_se_domain_attach(), to centralize
the logic for attaching "power" and "perf" domains to the GENI SE
device.

Signed-off-by: Praveen Talari <praveen.talari@....qualcomm.com>
---
 drivers/soc/qcom/qcom-geni-se.c  | 29 +++++++++++++++++++++++++++++
 include/linux/soc/qcom/geni-se.h |  4 ++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index fbffbc9ea7a6..decf7cf5172e 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -19,6 +19,7 @@
 #include <linux/of_platform.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
 #include <linux/pm_opp.h>
 #include <linux/soc/qcom/geni-se.h>
 
@@ -1090,6 +1091,34 @@ int geni_se_resources_activate(struct geni_se *se)
 	return ret;
 }
 
+/**
+ * geni_se_domain_attach() - Attach power domains to a GENI SE device.
+ * @se: Pointer to the geni_se structure representing the GENI SE device.
+ *
+ * This function attaches the necessary power domains ("power" and "perf")
+ * to the GENI Serial Engine device. It initializes `se->pd_list` with the
+ * attached domains.
+ *
+ * Return: 0 on success, or a negative error code on failure.
+ */
+int geni_se_domain_attach(struct geni_se *se)
+{
+	struct dev_pm_domain_attach_data pd_data = {
+		.pd_flags = PD_FLAG_DEV_LINK_ON,
+		.pd_names = (const char*[]) { "power", "perf" },
+		.num_pd_names = 2,
+	};
+	int ret;
+
+	ret = dev_pm_domain_attach_list(se->dev,
+					&pd_data, &se->pd_list);
+	if (ret <= 0)
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(geni_se_domain_attach);
+
 /**
  * geni_se_resources_init() - Initialize resources for a GENI SE device.
  * @se: Pointer to the geni_se structure representing the GENI SE device.
diff --git a/include/linux/soc/qcom/geni-se.h b/include/linux/soc/qcom/geni-se.h
index 36a68149345c..5f75159c5531 100644
--- a/include/linux/soc/qcom/geni-se.h
+++ b/include/linux/soc/qcom/geni-se.h
@@ -64,6 +64,7 @@ struct geni_icc_path {
  * @num_clk_levels:	Number of valid clock levels in clk_perf_tbl
  * @clk_perf_tbl:	Table of clock frequency input to serial engine clock
  * @icc_paths:		Array of ICC paths for SE
+ * @pd_list:		Power domain list for managing power domains
  * @has_opp:		Indicates if OPP is supported
  */
 struct geni_se {
@@ -75,6 +76,7 @@ struct geni_se {
 	unsigned int num_clk_levels;
 	unsigned long *clk_perf_tbl;
 	struct geni_icc_path icc_paths[3];
+	struct dev_pm_domain_list *pd_list;
 	bool has_opp;
 };
 
@@ -546,5 +548,7 @@ int geni_se_resources_activate(struct geni_se *se);
 int geni_se_resources_deactivate(struct geni_se *se);
 
 int geni_load_se_firmware(struct geni_se *se, enum geni_se_protocol_type protocol);
+
+int geni_se_domain_attach(struct geni_se *se);
 #endif
 #endif
-- 
2.34.1