linux-kernel - [PATCH v2] soc: renesas: rcar-sysc: Mark device node OF

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Date:   Thu, 28 Jan 2021 09:28:47 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Magnus Damm <magnus.damm@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-renesas-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2] soc: renesas: rcar-sysc: Mark device node OF_POPULATED after init

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 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 fails if fw_devlink is enabled:

    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.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Saravana Kannan <saravanak@...gle.com>
---
As this seems to be harmless if commit e590474768f1cc04 ("driver core:
Set fw_devlink=on by default") won't make v5.12, I plan to queue this in
renesas-devel for v5.12.

v2:
  - Add Reviewed-by,
  - s/platform devices/devices/,
  - Drop Fixes tag,
  - Drop RFC.
---
 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 d51ddc7d5232b9db..53387a72ca00ce79 100644
--- a/drivers/soc/renesas/rcar-sysc.c
+++ b/drivers/soc/renesas/rcar-sysc.c
@@ -434,6 +434,8 @@ 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);
 
 out_put:
 	of_node_put(np);
-- 
2.25.1