[PATCH/RFC] soc: renesas: rcar-sysc: Mark device node OF_POPULATED after init

From: Geert Uytterhoeven
Date: Wed Jan 20 2021 - 09:33:30 EST

The R-Car System Controller (SYSC) driver registers PM domains from an
early_initcall(). It does not use a platform driver, as secondary CPU
startup on R-Car H1 needs to control the CPU power domains, before
initialization of the driver framework.

As fw_devlink only considers platform devices, it does not know that the
System Controller is ready. Hence probing of on-chip devices that are
part of the SYSC PM domain fail:

probe deferral - supplier e6180000.system-controller not ready

Fix this by setting the OF_POPULATED flag for the SYSC device node after
successful initialization. This will make of_link_to_phandle() ignore
the SYSC device node as a dependency, and consumer devices will be
probed again.

Fixes: e590474768f1cc04 ("driver core: Set fw_devlink=on by default")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
drivers/soc/renesas/rcar-sysc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c
index 9b235fc900273405..a00bb098e1fe7488 100644
--- a/drivers/soc/renesas/rcar-sysc.c
+++ b/drivers/soc/renesas/rcar-sysc.c
@@ -439,6 +439,8 @@ static int __init rcar_sysc_pd_init(void)

error = of_genpd_add_provider_onecell(np, &domains->onecell_data);
+ if (!error)
+ of_node_set_flag(np, OF_POPULATED);