[PATCH v2 3/6] cpufreq: ti: Add device link to k3-socinfo

Akashdeep Kaur
2026-04-01T10:54:47Z

Create explicit device link from CPU device to k3-socinfo when the OPP
table specifies ti,soc-info property. This prevents unbinding k3-socinfo
while ti-cpufreq is using it for SoC revision detection.
This complements the EPROBE_DEFER handling that ensures initial probe
ordering.

Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
---
drivers/cpufreq/ti-cpufreq.c | 52 ++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)

diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c
index 88f7912ef6a8..7bd45b367b36 100644
--- a/drivers/cpufreq/ti-cpufreq.c
+++ b/drivers/cpufreq/ti-cpufreq.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/regmap.h>
@@ -111,6 +112,7 @@ struct ti_cpufreq_data {
struct device_node *opp_node;
struct regmap *syscon;
const struct ti_cpufreq_soc_data *soc_data;
+ struct device_link *soc_link;
};

static unsigned long amx3_efuse_xlate(struct ti_cpufreq_data *opp_data,
@@ -542,6 +544,7 @@ static int ti_cpufreq_probe(struct platform_device *pdev)
return -ENOMEM;

opp_data->soc_data = match->data;
+ platform_set_drvdata(pdev, opp_data);

opp_data->cpu_dev = get_cpu_device(0);
if (!opp_data->cpu_dev) {
@@ -560,6 +563,42 @@ static int ti_cpufreq_probe(struct platform_device *pdev)
if (ret)
goto fail_put_node;

+ /* Create device link to k3-socinfo if specified in DT */
+ if (opp_data->soc_data == &am625_soc_data ||
+ opp_data->soc_data == &am62a7_soc_data ||
+ opp_data->soc_data == &am62l3_soc_data ||
+ opp_data->soc_data == &am62p5_soc_data) {
+ struct device_node *socinfo_np;
+
+ socinfo_np = of_parse_phandle(opp_data->opp_node, "ti,soc-info", 0);
+ if (socinfo_np) {
+ struct platform_device *socinfo_pdev;
+ struct device_link *link;
+
+ socinfo_pdev = of_find_device_by_node(socinfo_np);
+ of_node_put(socinfo_np);
+
+ if (!socinfo_pdev) {
+ ret = -EPROBE_DEFER;
+ goto fail_put_node;
+ }
+
+ if (!socinfo_pdev->dev.driver) {
+ put_device(&socinfo_pdev->dev);
+ ret = -EPROBE_DEFER;
+ goto fail_put_node;
+ }
+
+ link = device_link_add(opp_data->cpu_dev,
+ &socinfo_pdev->dev,
+ DL_FLAG_STATELESS);
+ if (link)
+ opp_data->soc_link = link;
+
+ put_device(&socinfo_pdev->dev);
+ }
+ }
+
/*
* OPPs determine whether or not they are supported based on
* two metrics:
@@ -600,6 +639,18 @@ static int ti_cpufreq_probe(struct platform_device *pdev)
return ret;
}

+static void ti_cpufreq_remove(struct platform_device *pdev)
+{
+ struct ti_cpufreq_data *opp_data = platform_get_drvdata(pdev);
+
+ /*
+ * Device link is automatically removed with DL_FLAG_AUTOREMOVE_CONSUMER,
+ * but explicitly delete it for safety.
+ */
+ if (opp_data && opp_data->soc_link)
+ device_link_del(opp_data->soc_link);
+}
+
static int __init ti_cpufreq_init(void)
{
const struct of_device_id *match;
@@ -616,6 +667,7 @@ module_init(ti_cpufreq_init);

static struct platform_driver ti_cpufreq_driver = {
.probe = ti_cpufreq_probe,
+ .remove = ti_cpufreq_remove,
.driver = {
.name = "ti-cpufreq",
},
--
2.34.1