The quirk for R-Car E3 ES1.0 added in commit 086b399965 ("soc:
renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}") makes the 3DG-A
PM domain a subdomain of the 3DG-B PM domain. However, registering
3DG-A with its parent fails silently, as the 3DG-B PM domain hasn't been
registered yet, and such failures are never reported.
Fix this by:
1. Splitting PM Domain initialization in two steps, so all PM domains
are registered before any child-parent links are established,
2. Reporting any failures in establishing child-parent relations.
Check for and report pm_genpd_init() failures, too, as that function
gained a return value in commit 7eb231c337 ("PM / Domains: Convert
pm_genpd_init() to return an error code").
Fixes: 086b399965 ("soc: renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
977d5ba450