Messages in this thread Patch in this message |  | | From | Akashdeep Kaur <> | | Subject | [PATCH 5/5] cpufreq: ti: Add device link to k3-socinfo | | Date | Mon, 30 Mar 2026 17:31:05 +0530 |
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Create explicit device link when OPP table has ti,soc-info property. Prevents unbinding k3-socinfo while ti-cpufreq is using it.
Signed-off-by: Akashdeep Kaur <a-kaur@ti.com> --- drivers/cpufreq/ti-cpufreq.c | 48 ++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)
diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c index 88f7912ef6a8..60c34b0da0c5 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 +639,14 @@ 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); + + 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 +663,7 @@ 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
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