Bluetooth: btmrvl: add DT bindings documentation

Calibration data can be downloaded through device tree method. This
patch adds the documentation. Also, instead of searching device tree
node by name using of_find_node_by_name() API, let's use
for_each_compatible_node().

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 36 insertions, 17 deletions

diff --git a/Documentation/devicetree/bindings/btmrvl.txt b/Documentation/devicetree/bindings/btmrvl.txt
new file mode 100644
index 000000000000..cdd57680a749
--- /dev/null
+++ b/Documentation/devicetree/bindings/btmrvl.txt
@@ -0,0 +1,22 @@
+btmrvl
+------
+
+Required properties:
+
+  - compatible : must be "btmrvl,cfgdata"
+
+Optional properties:
+
+  - btmrvl,cal-data : Calibration data downloaded to the device during
+                      initialization. This is an array of 28 values(u8).
+
+Example:
+
+btmrvl {
+        compatible = "btmrvl,cfgdata";
+
+        btmrvl,cal-data = /bits/ 8 <
+                0x37 0x01 0x1c 0x00 0xff 0xff 0xff 0xff 0x01 0x7f 0x04 0x02
+                0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
+                0x00 0x00 0xf0 0x00>;
+};
diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index 1d7db2064889..2909bca6b8b6 100644
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -496,25 +496,22 @@ static int btmrvl_cal_data_dt(struct btmrvl_private *priv)
 {
         struct device_node *dt_node;
         u8 cal_data[BT_CAL_HDR_LEN + BT_CAL_DATA_SIZE];
-        const char name[] = "btmrvl_caldata";
-        const char property[] = "btmrvl,caldata";
         int ret;
 
-        dt_node = of_find_node_by_name(NULL, name);
-        if (!dt_node)
-                return -ENODEV;
-
-        ret = of_property_read_u8_array(dt_node, property,
-                                        cal_data + BT_CAL_HDR_LEN,
-                                        BT_CAL_DATA_SIZE);
-        if (ret)
-                return ret;
-
-        BT_DBG("Use cal data from device tree");
-        ret = btmrvl_download_cal_data(priv, cal_data, BT_CAL_DATA_SIZE);
-        if (ret) {
-                BT_ERR("Fail to download calibrate data");
-                return ret;
+        for_each_compatible_node(dt_node, NULL, "btmrvl,cfgdata") {
+                ret = of_property_read_u8_array(dt_node, "btmrvl,cal-data",
+                                                cal_data + BT_CAL_HDR_LEN,
+                                                BT_CAL_DATA_SIZE);
+                if (ret)
+                        return ret;
+
+                BT_DBG("Use cal data from device tree");
+                ret = btmrvl_download_cal_data(priv, cal_data,
+                                               BT_CAL_DATA_SIZE);
+                if (ret) {
+                        BT_ERR("Fail to download calibrate data");
+                        return ret;
+                }
         }
 
         return 0;