[PATCH v4 04/18] soc: imx: gpcv2: add lockdep annotation

Lucas Stach l.stach at pengutronix.de
Fri Sep 10 13:26:26 PDT 2021


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 at pengutronix.de>
Reviewed-by: Peng Fan <peng.fan at nxp.com>
---
 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




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