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From:   Geert Uytterhoeven <geert+renesas@glider.be>
To:     Saravana Kannan <saravanak@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>
Cc:     Marc Zyngier <maz@kernel.org>, Kevin Hilman <khilman@baylibre.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        linux-renesas-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH/RFC] soc: renesas: rcar-sysc: Mark device node OF_POPULATED after init
Date:   Wed, 20 Jan 2021 15:23:23 +0100
Message-Id: <20210120142323.2203705-1-geert+renesas@glider.be>
MIME-Version: 1.0
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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@glider.be>
---
 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);
 
 out_put:
 	of_node_put(np);
-- 
2.25.1