linux-kernel - [PATCH] of: Don't create platform device for OPP tables

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Date:   Tue, 10 Apr 2018 14:35:22 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org, Stephen Boyd <sboyd@...nel.org>,
        devicetree@...r.kernel.org
Subject: [PATCH] of: Don't create platform device for OPP tables

The OPP tables are present as separate nodes, whose phandle is used in
the "operating-points-v2" property of devices. Currently the OF core
creates a platform device for the OPP table unconditionally, which is
not used by any kernel code.

Skip creating OPP table platform devices.

Reported-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/of/platform.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index c00d81dfac0b..aaae5d90433d 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -356,6 +356,12 @@ static int of_platform_bus_create(struct device_node *bus,
 		return 0;
 	}
 
+	/* OPP tables have separate nodes, but we don't want devices for them */
+	if (unlikely(of_device_is_compatible(bus, "operating-points-v2"))) {
+		pr_debug("%s() - skipping OPP node %pOF\n", __func__, bus);
+		return 0;
+	}
+
 	if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
 		pr_debug("%s() - skipping %pOF, already populated\n",
 			__func__, bus);
-- 
2.15.0.194.g9af6a3dea062