[PATCH v3 05/18] clk: qcom: common: Handle runtime power management in qcom_cc_really_probe

From: Jagadeesh Kona
Date: Thu Mar 27 2025 - 05:56:09 EST


Add support for runtime power management in qcom_cc_really_probe() to
commonize it across all the clock controllers. The runtime power management
is not required for all clock controllers, hence handle the rpm based on
use_rpm flag in clock controller descriptor.

Signed-off-by: Jagadeesh Kona <quic_jkona@xxxxxxxxxxx>
---
drivers/clk/qcom/common.c | 37 ++++++++++++++++++++++++++++---------
drivers/clk/qcom/common.h | 1 +
2 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
index 9e3380fd718198c9fe63d7361615a91c3ecb3d60..9cbf1c5296dad3ee5477a2f5a445488707663b9d 100644
--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -9,6 +9,7 @@
#include <linux/platform_device.h>
#include <linux/clk-provider.h>
#include <linux/interconnect-clk.h>
+#include <linux/pm_runtime.h>
#include <linux/reset-controller.h>
#include <linux/of.h>

@@ -304,6 +305,16 @@ int qcom_cc_really_probe(struct device *dev,
if (ret < 0 && ret != -EEXIST)
return ret;

+ if (desc->use_rpm) {
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
+ return ret;
+ }
+
reset = &cc->reset;
reset->rcdev.of_node = dev->of_node;
reset->rcdev.ops = &qcom_reset_ops;
@@ -314,23 +325,25 @@ int qcom_cc_really_probe(struct device *dev,

ret = devm_reset_controller_register(dev, &reset->rcdev);
if (ret)
- return ret;
+ goto put_rpm;

if (desc->gdscs && desc->num_gdscs) {
scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
- if (!scd)
- return -ENOMEM;
+ if (!scd) {
+ ret = -ENOMEM;
+ goto put_rpm;
+ }
scd->dev = dev;
scd->scs = desc->gdscs;
scd->num = desc->num_gdscs;
scd->pd_list = cc->pd_list;
ret = gdsc_register(scd, &reset->rcdev, regmap);
if (ret)
- return ret;
+ goto put_rpm;
ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
scd);
if (ret)
- return ret;
+ goto put_rpm;
}

cc->rclks = rclks;
@@ -341,7 +354,7 @@ int qcom_cc_really_probe(struct device *dev,
for (i = 0; i < num_clk_hws; i++) {
ret = devm_clk_hw_register(dev, clk_hws[i]);
if (ret)
- return ret;
+ goto put_rpm;
}

for (i = 0; i < num_clks; i++) {
@@ -350,14 +363,20 @@ int qcom_cc_really_probe(struct device *dev,

ret = devm_clk_register_regmap(dev, rclks[i]);
if (ret)
- return ret;
+ goto put_rpm;
}

ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
if (ret)
- return ret;
+ goto put_rpm;
+
+ ret = qcom_cc_icc_register(dev, desc);
+
+put_rpm:
+ if (desc->use_rpm)
+ pm_runtime_put(dev);

- return qcom_cc_icc_register(dev, desc);
+ return ret;
}
EXPORT_SYMBOL_GPL(qcom_cc_really_probe);

diff --git a/drivers/clk/qcom/common.h b/drivers/clk/qcom/common.h
index 7ace5d7f5836aa81431153ba92d8f14f2ffe8147..9c10bc8c197cd7dfa25ccd245763ad6acb081523 100644
--- a/drivers/clk/qcom/common.h
+++ b/drivers/clk/qcom/common.h
@@ -38,6 +38,7 @@ struct qcom_cc_desc {
const struct qcom_icc_hws_data *icc_hws;
size_t num_icc_hws;
unsigned int icc_first_node_id;
+ bool use_rpm;
};

/**

--
2.34.1