linux-kernel - [PATCH v2] soc: renesas: rmobile-sysc: Mark fwnode when PM domain is added

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Date:   Tue, 16 Feb 2021 13:39:58 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Magnus Damm <magnus.damm@...il.com>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        linux-renesas-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2] soc: renesas: rmobile-sysc: Mark fwnode when PM domain is added

Currently, there are two drivers binding to the R-Mobile System
Controller (SYSC):
  - The rmobile-sysc driver registers PM domains from a core_initcall(),
    and does not use a platform driver,
  - The optional rmobile-reset driver registers a reset handler, and
    does use a platform driver.

As fw_devlink only considers devices, commit bab2d712eeaf9d60 ("PM:
domains: Mark fwnodes when their powerdomain is added/removed") works
only for PM Domain drivers where the DT node is a real device node, and
not for PM Domain drivers using a hierarchical representation inside a
subnode.  Hence if fw_devlink is enabled, probing of on-chip devices
that are part of the SYSC PM domain is deferred until the optional
rmobile-reset driver has been bound.   If the rmobile-reset driver is
not available, this will never happen, and thus lead to complete system
boot failures.

Fix this by explicitly marking the fwnode initialized.

Suggested-by: Saravana Kannan <saravanak@...gle.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
This is v2 of "soc: renesas: rmobile-sysc: Set OF_POPULATED and absorb
reset handling".
To be queued in renesas-devel as a fix for v5.12 if v5.12-rc1 will have
fw_devlink enabled.

v2:
  - Call fwnode_dev_initialized() instead of setting OF_POPULATED,
  - Drop reset handling move, as fwnode_dev_initialized() does not
    prevent the rmobile-reset driver from binding against the same
    device.
---
 drivers/soc/renesas/rmobile-sysc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/soc/renesas/rmobile-sysc.c b/drivers/soc/renesas/rmobile-sysc.c
index bf64d052f9245db5..204e6135180b919c 100644
--- a/drivers/soc/renesas/rmobile-sysc.c
+++ b/drivers/soc/renesas/rmobile-sysc.c
@@ -342,6 +342,8 @@ static int __init rmobile_init_pm_domains(void)
 			of_node_put(np);
 			break;
 		}
+
+		fwnode_dev_initialized(&np->fwnode, true);
 	}
 
 	put_special_pds();
-- 
2.25.1