[PATCH v3 01/24] pmdomain: renesas: rcar-sysc: Add genpd OF provider at postcore_initcall

[Ulf Hansson]

Subsequent changes to genpd adds a limitation that registering a genpd OF
providers must be done after its bus registration, which is at
core_initcall.

To adopt to this, let's split the initialization into two steps. The first
part keep registering the PM domains with genpd at early_initcall, as this
is needed to bringup the CPUs for R-Car H1, by calling
rcar_sysc_power_up_cpu(). The second and new part, moves the registration
of the genpd OF provider to a postcore_initcall().

Suggested-by: Geert Uytterhoeven <geert at linux-m68k.org>
Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
---

Changes in v3:
	- New patch.

---
 drivers/pmdomain/renesas/rcar-sysc.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/pmdomain/renesas/rcar-sysc.c b/drivers/pmdomain/renesas/rcar-sysc.c
index 047495f54e8a..4b310c1d35fa 100644
--- a/drivers/pmdomain/renesas/rcar-sysc.c
+++ b/drivers/pmdomain/renesas/rcar-sysc.c
@@ -342,6 +342,7 @@ struct rcar_pm_domains {
 };
 
 static struct genpd_onecell_data *rcar_sysc_onecell_data;
+static struct device_node *rcar_sysc_onecell_np;
 
 static int __init rcar_sysc_pd_init(void)
 {
@@ -428,7 +429,8 @@ static int __init rcar_sysc_pd_init(void)
 		}
 	}
 
-	error = of_genpd_add_provider_onecell(np, &domains->onecell_data);
+	rcar_sysc_onecell_np = np;
+	return 0;
 
 out_put:
 	of_node_put(np);
@@ -436,6 +438,21 @@ static int __init rcar_sysc_pd_init(void)
 }
 early_initcall(rcar_sysc_pd_init);
 
+static int __init rcar_sysc_pd_init_provider(void)
+{
+	int error;
+
+	if (!rcar_sysc_onecell_np)
+		return -ENODEV;
+
+	error = of_genpd_add_provider_onecell(rcar_sysc_onecell_np,
+					      rcar_sysc_onecell_data);
+
+	of_node_put(rcar_sysc_onecell_np);
+	return error;
+}
+postcore_initcall(rcar_sysc_pd_init_provider);
+
 #ifdef CONFIG_ARCH_R8A7779
 static int rcar_sysc_power_cpu(unsigned int idx, bool on)
 {
-- 
2.43.0