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Bluetooth: btmrvl: add DT bindings documentation

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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>
This commit is contained in:
Amitkumar Karwar 2014-11-19 01:28:32 -08:00 • committed by Marcel Holtmann
parent 0378b59770
commit 098ea6bc4c
2 changed files with 35 additions and 16 deletions
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22
Documentation/devicetree/bindings/btmrvl.txt Normal file
View file

@ -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>;
};

29
drivers/bluetooth/btmrvl_main.c
View file

@ -496,25 +496,22 @@ static int btmrvl_cal_data_dt(struct btmrvl_private *priv)
{ {
struct device_node *dt_node; struct device_node *dt_node;
u8 cal_data[BT_CAL_HDR_LEN + BT_CAL_DATA_SIZE]; u8 cal_data[BT_CAL_HDR_LEN + BT_CAL_DATA_SIZE];
const char name[] = "btmrvl_caldata";
const char property[] = "btmrvl,caldata";
int ret; int ret;
dt_node = of_find_node_by_name(NULL, name); for_each_compatible_node(dt_node, NULL, "btmrvl,cfgdata") {
if (!dt_node) ret = of_property_read_u8_array(dt_node, "btmrvl,cal-data",
return -ENODEV; cal_data + BT_CAL_HDR_LEN,
BT_CAL_DATA_SIZE);
if (ret)
return ret;
ret = of_property_read_u8_array(dt_node, property, BT_DBG("Use cal data from device tree");
cal_data + BT_CAL_HDR_LEN, ret = btmrvl_download_cal_data(priv, cal_data,
BT_CAL_DATA_SIZE); BT_CAL_DATA_SIZE);
if (ret) if (ret) {
return ret; BT_ERR("Fail to download calibrate data");
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; return 0;