linux-kernel - [PATCH v5 3/3] thermal: tegra: parse sensor id before sensor register

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Date:   Mon, 3 Dec 2018 13:55:23 +0800
From:   Wei Ni <wni@...dia.com>
To:     <thierry.reding@...il.com>, <daniel.lezcano@...aro.org>,
        <linux-tegra@...r.kernel.org>
CC:     <rui.zhang@...el.com>, <edubezval@...il.com>, <srikars@...dia.com>,
        <linux-kernel@...r.kernel.org>, Wei Ni <wni@...dia.com>
Subject: [PATCH v5 3/3] thermal: tegra: parse sensor id before sensor register

Since different platforms may not support all 4
sensors, so the sensor registration may be failed.
Add codes to parse dt to find sensor id which
need to be registered. So that the registration
can be successful on all platform.

Signed-off-by: Wei Ni <wni@...dia.com>
---
 drivers/thermal/tegra/soctherm.c | 45 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
index fd2703c0cfc5..45e3ae8aac86 100644
--- a/drivers/thermal/tegra/soctherm.c
+++ b/drivers/thermal/tegra/soctherm.c
@@ -1224,6 +1224,41 @@ static void soctherm_init(struct platform_device *pdev)
 	tegra_soctherm_throttle(&pdev->dev);
 }
 
+static bool tegra_soctherm_find_sensor_id(unsigned int sensor_id)
+{
+	bool ret = false;
+	struct of_phandle_args sensor_specs;
+	struct device_node *np, *sensor_np;
+
+	np = of_find_node_by_name(NULL, "thermal-zones");
+	if (!np)
+		return ret;
+
+	for_each_available_child_of_node(np, sensor_np) {
+		if (of_parse_phandle_with_args(sensor_np, "thermal-sensors",
+						 "#thermal-sensor-cells",
+						 0, &sensor_specs))
+			continue;
+
+		if (sensor_specs.args_count != 1) {
+			WARN(sensor_specs.args_count != 1,
+			     "%s: wrong cells in sensor specifier %d\n",
+			     sensor_specs.np->name, sensor_specs.args_count);
+			continue;
+		}
+
+		if (sensor_specs.args[0] == sensor_id) {
+			ret = true;
+			break;
+		}
+	}
+
+	of_node_put(np);
+	of_node_put(sensor_np);
+
+	return ret;
+}
+
 static const struct of_device_id tegra_soctherm_of_match[] = {
 #ifdef CONFIG_ARCH_TEGRA_124_SOC
 	{
@@ -1365,13 +1400,16 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
 		zone->sg = soc->ttgs[i];
 		zone->ts = tegra;
 
+		if (!tegra_soctherm_find_sensor_id(soc->ttgs[i]->id))
+			continue;
+
 		z = devm_thermal_zone_of_sensor_register(&pdev->dev,
 							 soc->ttgs[i]->id, zone,
 							 &tegra_of_thermal_ops);
 		if (IS_ERR(z)) {
 			err = PTR_ERR(z);
-			dev_err(&pdev->dev, "failed to register sensor: %d\n",
-				err);
+			dev_err(&pdev->dev, "failed to register sensor %s: %d\n",
+				soc->ttgs[i]->name, err);
 			goto disable_clocks;
 		}
 
@@ -1434,6 +1472,9 @@ static int __maybe_unused soctherm_resume(struct device *dev)
 		struct thermal_zone_device *tz;
 
 		tz = tegra->thermctl_tzs[soc->ttgs[i]->id];
+		if (!tz)
+			continue;
+
 		err = tegra_soctherm_set_hwtrips(dev, soc->ttgs[i], tz);
 		if (err) {
 			dev_err(&pdev->dev,
-- 
2.7.4