linux-kernel - [PATCH 5/8] thermal:cpu cooling:tegra: Provide deferred probing for tegra driver

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Date:	Thu, 13 Nov 2014 18:02:42 +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 5/8] thermal:cpu cooling:tegra: Provide deferred probing for
 tegra 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/tegra_soctherm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/thermal/tegra_soctherm.c b/drivers/thermal/tegra_soctherm.c
index 70f7e9e..9c5aaa4 100644
--- a/drivers/thermal/tegra_soctherm.c
+++ b/drivers/thermal/tegra_soctherm.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/reset.h>
 #include <linux/thermal.h>
+#include <linux/cpufreq.h>
 
 #include <soc/tegra/fuse.h>
 
@@ -346,6 +347,12 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
 
 	const struct tegra_tsensor *tsensors = t124_tsensors;
 
+#ifdef CONFIG_CPU_THERMAL
+	if (!cpufreq_get_current_driver()) {
+		dev_dbg(&pdev->dev, "no cpufreq driver!");
+		return -EPROBE_DEFER;
+	}
+#endif
 	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
 	if (!tegra)
 		return -ENOMEM;
-- 
2.0.0.rc2

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