linux-kernel - [PATCH 3/8] thermal:cpu cooling:rcar: Provide deferred probing for rcar driver

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Message-id: <1415898165-27406-4-git-send-email-l.majewski@samsung.com>
Date:	Thu, 13 Nov 2014 18:02:40 +0100
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Eduardo Valentin <edubezval@...il.com>,
	Zhang Rui <rui.zhang@...el.com>
Cc:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@...com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Nobuhiro Iwamatsu <iwamatsu@...auri.org>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lukasz Majewski <l.majewski@...sung.com>
Subject: [PATCH 3/8] thermal:cpu cooling:rcar: Provide deferred probing for
 rcar driver

When CPU freq is used as a thermal zone cooling device, one needs to wait
until cpufreq subsystem is properly initialized.

This code is similar to the one already available in imx_thermal.c file.

Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
---
 drivers/thermal/rcar_thermal.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 8803e69..b268b4d 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -29,6 +29,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/thermal.h>
+#include <linux/cpufreq.h>
 
 #define IDLE_INTERVAL	5000
 
@@ -373,6 +374,12 @@ static int rcar_thermal_probe(struct platform_device *pdev)
 	int ret = -ENODEV;
 	int idle = IDLE_INTERVAL;
 
+#ifdef CONFIG_CPU_THERMAL
+	if (!cpufreq_get_current_driver()) {
+		dev_dbg(&pdev->dev, "no cpufreq driver!");
+		return -EPROBE_DEFER;
+	}
+#endif
 	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
 	if (!common)
 		return -ENOMEM;
-- 
2.0.0.rc2

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