Some of the GPCv2 power domains are nested inside each other without
visibility to lockdep at the genpd level, as they are in separate
driver instances and don't have a parent/child power-domain relationship.

Add a subclass annotation to the nested domains to let lockdep know that
it is okay to take the genpd lock in a nested fashion.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/soc/imx/gpcv2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index 2c43e74db0be..35f26f57d1ac 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c

@@ -898,6 +898,10 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
 		goto out_domain_unmap;
 	}
 
+	if (IS_ENABLED(CONFIG_LOCKDEP) &&
+	    of_property_read_bool(domain->dev->of_node, "power-domains"))
+		lockdep_set_subclass(&domain->genpd.mlock, 1);
+
 	ret = of_genpd_add_provider_simple(domain->dev->of_node,
 					   &domain->genpd);
 	if (ret) {

-- 
2.30.2