[Skiboot] [PATCH v2 03/13] dts: add device tree nodes for the core temperatures

[Cédric Le Goater]

This patch simply adds sensors nodes for the core temperatures. It
uses the core PIR as a resource identifier to fit in the sensor model.

The device tree nodes use the new layout.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---

Changes since v1:

 - removed creation of "/ibm,opal/sensors" as it is now done in 
   sensor_init()

Changes since RFC:

 - "/ibm,opal/sensors" needs to be created on open power platform

 core/sensor.c |    2 ++
 hw/dts.c      |   36 ++++++++++++++++++++++++++++++++++++
 include/dts.h |    1 +
 3 files changed, 39 insertions(+)

diff --git a/core/sensor.c b/core/sensor.c
index f2f86c8813ca..e0088fe5bce9 100644
--- a/core/sensor.c
+++ b/core/sensor.c
@@ -40,6 +40,8 @@ void sensor_init(void)
 {
 	sensor_node = dt_new(opal_node, "sensors");
 
+	dts_sensor_create_nodes(sensor_node);
+
 	/* Register OPAL interface */
 	opal_register(OPAL_SENSOR_READ, opal_sensor_read, 3);
 }
diff --git a/hw/dts.c b/hw/dts.c
index 8affac34c9c5..a58703cf28de 100644
--- a/hw/dts.c
+++ b/hw/dts.c
@@ -19,6 +19,7 @@
 #include <sensor.h>
 #include <dts.h>
 #include <skiboot.h>
+#include <opal-api.h>
 
 /* Per core Digital Thermal Sensors */
 #define EX_THERM_DTS_RESULT0	0x10050000
@@ -163,3 +164,38 @@ int64_t dts_sensor_read(uint32_t sensor_hndl, uint32_t *sensor_data)
 
 	return 0;
 }
+
+bool dts_sensor_create_nodes(struct dt_node *sensors)
+{
+	uint8_t sensor_class = SENSOR_DTS_CORE_TEMP|SENSOR_DTS;
+
+	struct proc_chip *chip;
+	char name[64];
+
+	/* build the device tree nodes :
+	 *
+	 *     sensors/core-temp at pir
+	 *
+	 * The core is identified by its PIR, is stored in the resource
+	 * number of the sensor handler.
+	 */
+	for_each_chip(chip) {
+		struct cpu_thread *c;
+
+		for_each_available_core_in_chip(c, chip->id) {
+			struct dt_node *node;
+			uint32_t handler;
+
+			snprintf(name, sizeof(name), "core-temp@%x", c->pir);
+
+			handler = sensor_make_handler(sensor_class,
+					c->pir, SENSOR_DTS_ATTR_TEMP_MAX);
+			node = dt_new(sensors, name);
+			dt_add_property_string(node, "compatible",
+					       "ibm,opal-sensor");
+			dt_add_property_cells(node, "sensor-data", handler);
+		}
+	}
+
+	return true;
+}
diff --git a/include/dts.h b/include/dts.h
index 18933909ee08..8d6a61226917 100644
--- a/include/dts.h
+++ b/include/dts.h
@@ -20,5 +20,6 @@
 #include <stdint.h>
 
 extern int64_t dts_sensor_read(uint32_t sensor_hndl, uint32_t *sensor_data);
+extern bool dts_sensor_create_nodes(struct dt_node *sensors);
 
 #endif /* __DTS_H */
-- 
1.7.10.4