[PATCH 2/2] pmdomain/rockchip: skip domains returning -EPROBE_DEFER

[Daniel Bozeman]

When iterating child nodes during probe, a single domain returning
-EPROBE_DEFER (e.g. due to clock dependencies not yet available)
causes the entire power domain controller to fail and tear down all
successfully registered domains.

This creates a window where devices in unrelated power domains that
would have registered successfully cannot access their hardware. On
RK3528, PD_GPU requires CRU clocks that may not be available yet,
but the idle-only domains (PD_RKVENC, PD_VO, PD_VPU) have no clock
requirements. When the controller fails due to PD_GPU, GPIO
controllers in PD_RKVENC become inaccessible, leading to synchronous
external aborts when GPIO-controlled regulators probe.

Skip domains that return -EPROBE_DEFER and continue registering the
rest. Skipped domains have NULL entries in the provider, causing
their consumers to receive -ENOENT and defer until available.

Fixes: 7c696693a4f5 ("soc: rockchip: power-domain: Add power domain driver")
Signed-off-by: Daniel Bozeman <daniel at orb.net>
---
 drivers/pmdomain/rockchip/pm-domains.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c
index 2eecae092a..f42880c94f 100644
--- a/drivers/pmdomain/rockchip/pm-domains.c
+++ b/drivers/pmdomain/rockchip/pm-domains.c
@@ -1077,6 +1077,11 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev)
 	for_each_available_child_of_node_scoped(np, node) {
 		error = rockchip_pm_add_one_domain(pmu, node);
 		if (error) {
+			if (error == -EPROBE_DEFER) {
+				dev_dbg(dev, "skipped node %pOFn, dependencies not yet available\n",
+					node);
+				continue;
+			}
 			dev_err(dev, "failed to handle node %pOFn: %d\n",
 				node, error);
 			goto err_out;
-- 
2.43.0