soc: imx: gpcv2: add lockdep annotation

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>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index 7fbf1f25b48e5b3af50ed3b96ace74d99c6ecedd..fcea95317287e34da970170037e25b4357ee5163 100644 (file)
--- 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) {