zephyr: DT: support creating motion_als_sensors

This change allows to create motion_als_sensors array
by using the information from DT.

BUG=b:173507858
BRANCH=none
TEST=make buildall -j8
build volteer on zephyr

Signed-off-by: Hyungwoo Yang <hyungwoo.yang@intel.corp-partner.google.com>
Change-Id: Ic1c169d8f98de9f6b09f68d99844cb709f57e33d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2778817
Reviewed-by: Simon Glass <sjg@chromium.org>

3 files changed, 68 insertions, 0 deletions

diff --git a/zephyr/dts/bindings/motionsense/cros-ec,motionsense-sensor-info.yaml b/zephyr/dts/bindings/motionsense/cros-ec,motionsense-sensor-info.yaml
new file mode 100644
index 0000000000..9afa040da8
--- /dev/null
+++ b/zephyr/dts/bindings/motionsense/cros-ec,motionsense-sensor-info.yaml
@@ -0,0 +1,32 @@
+# Copyright 2021 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+description: The node has the information required by motion sense running
+
+compatible: "cros-ec,motionsense-sensor-info"
+
+properties:
+  als-sensors:
+    type: phandles
+    required: false
+    description: |
+        List of ALS sensors to create motion_als_sensors array.
+        The ALS sensors listed in the motion_als_sensors array
+        are managed by motion sense task. The task reads the sensor
+        data from the sensors and put them into the designated part
+        in the ec mmap. For example, als_clear and als_rgb are aliases
+        of ALS sensor noded defined in motionsense-sensor node.
+        als-sensors = <&als_clear, &als_rgb>;
+        This will automatically generate motion_als_sensors array from it.
+
+#
+# examples:
+#
+# motionsense-sensor-info {
+#        compatible = "cros-ec,motionsense-sensor-info";
+#
+#        /* list of entries for motion_als_sensors */
+#        als-sensors = <&als_clear>;
+# };
+#
diff --git a/zephyr/shim/include/motionsense_sensors.h b/zephyr/shim/include/motionsense_sensors.h
index f0c51c1f7b..fe9b294d45 100644
--- a/zephyr/shim/include/motionsense_sensors.h
+++ b/zephyr/shim/include/motionsense_sensors.h
@@ -9,6 +9,7 @@
 #include <devicetree.h>
 
 #define SENSOR_NODE			DT_PATH(motionsense_sensor)
+#define SENSOR_INFO_NODE		DT_PATH(motionsense_sensor_info)
 
 #define SENSOR_ID(id)			DT_CAT(SENSOR_, id)
 #define SENSOR_ID_WITH_COMMA(id)					\
diff --git a/zephyr/shim/src/motionsense_sensors.c b/zephyr/shim/src/motionsense_sensors.c
index f01f782dd8..d2567cb8fe 100644
--- a/zephyr/shim/src/motionsense_sensors.c
+++ b/zephyr/shim/src/motionsense_sensors.c
@@ -285,3 +285,38 @@ unsigned int motion_sensor_count = ARRAY_SIZE(motion_sensors);
 #else
 const unsigned int motion_sensor_count = ARRAY_SIZE(motion_sensors);
 #endif
+
+/*
+ * Create a list of ALS sensors needed by motion sense
+ *
+ * The following example adds tcs3400 als sensor to motion_als_sensors array
+ *
+ * motionsense-sensors {
+ *         lid_accel: bma255 {
+ *             :
+ *         };
+ *             :
+ *             :
+ *         als_clear: tcs3400 {
+ *             :
+ *         };
+ * };
+ *
+ * motionsense-sensor-info {
+ *       compatible = "cros-ec,motionsense-sensor-info";
+ *
+ *       // list of entries for motion_als_sensors
+ *       als-sensors = <&als_clear>;
+ *                  :
+ *                  :
+ * };
+ */
+#if DT_NODE_HAS_PROP(SENSOR_INFO_NODE, als_sensors)
+#define ALS_SENSOR_ENTRY_WITH_COMMA(i, id)		\
+	&motion_sensors[SENSOR_ID(DT_PHANDLE_BY_IDX(id, als_sensors, i))],
+const struct motion_sensor_t *motion_als_sensors[] = {
+	UTIL_LISTIFY(DT_PROP_LEN(SENSOR_INFO_NODE, als_sensors),
+		     ALS_SENSOR_ENTRY_WITH_COMMA, SENSOR_INFO_NODE)
+};
+BUILD_ASSERT(ARRAY_SIZE(motion_als_sensors) == ALS_COUNT);
+#endif