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charset="utf-8" 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 --- 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 #include #include +#include #include #include #include @@ -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; }; =20 static unsigned long amx3_efuse_xlate(struct ti_cpufreq_data *opp_data, @@ -542,6 +544,7 @@ static int ti_cpufreq_probe(struct platform_device *pde= v) return -ENOMEM; =20 opp_data->soc_data =3D match->data; + platform_set_drvdata(pdev, opp_data); =20 opp_data->cpu_dev =3D get_cpu_device(0); if (!opp_data->cpu_dev) { @@ -560,6 +563,42 @@ static int ti_cpufreq_probe(struct platform_device *pd= ev) if (ret) goto fail_put_node; =20 + /* Create device link to k3-socinfo if specified in DT */ + if (opp_data->soc_data =3D=3D &am625_soc_data || + opp_data->soc_data =3D=3D &am62a7_soc_data || + opp_data->soc_data =3D=3D &am62l3_soc_data || + opp_data->soc_data =3D=3D &am62p5_soc_data) { + struct device_node *socinfo_np; + + socinfo_np =3D 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 =3D of_find_device_by_node(socinfo_np); + of_node_put(socinfo_np); + + if (!socinfo_pdev) { + ret =3D -EPROBE_DEFER; + goto fail_put_node; + } + + if (!socinfo_pdev->dev.driver) { + put_device(&socinfo_pdev->dev); + ret =3D -EPROBE_DEFER; + goto fail_put_node; + } + + link =3D device_link_add(opp_data->cpu_dev, + &socinfo_pdev->dev, + DL_FLAG_STATELESS); + if (link) + opp_data->soc_link =3D 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 *pd= ev) return ret; } =20 +static void ti_cpufreq_remove(struct platform_device *pdev) +{ + struct ti_cpufreq_data *opp_data =3D 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); =20 static struct platform_driver ti_cpufreq_driver =3D { .probe =3D ti_cpufreq_probe, + .remove =3D ti_cpufreq_remove, .driver =3D { .name =3D "ti-cpufreq", }, --=20 2.34.1