1 Nokia Bluetooth Chips
2 ---------------------
3
4 Nokia phones often come with UART connected bluetooth chips from different
5 vendors and modified device API. Those devices speak a protocol named H4+
6 (also known as h4p) by Nokia, which is similar to the H4 protocol from the
7 Bluetooth standard. In addition to the H4 protocol it specifies two more
8 UART status lines for wakeup of UART transceivers to improve power management
9 and a few new packet types used to negotiate uart speed.
10
11 Required properties:
12
13 - compatible: should contain "nokia,h4p-bluetooth" as well as one of the following:
14 * "brcm,bcm2048-nokia"
15 * "ti,wl1271-bluetooth-nokia"
16 - reset-gpios: GPIO specifier, used to reset the BT module (active low)
17 - bluetooth-wakeup-gpios: GPIO specifier, used to wakeup the BT module (active high)
18 - host-wakeup-gpios: GPIO specifier, used to wakeup the host processor (active high)
19 - clock-names: should be "sysclk"
20 - clocks: should contain a clock specifier for every name in clock-names
21
22 Optional properties:
23
24 - None
25
26 Example:
27
28 / {
29 /* controlled (enabled/disabled) directly by BT module */
30 bluetooth_clk: vctcxo {
31 compatible = "fixed-clock";
32 #clock-cells = <0>;
33 clock-frequency = <38400000>;
34 };
35 };
36
37 &uart2 {
38 pinctrl-names = "default";
39 pinctrl-0 = <&uart2_pins>;
40
41 bluetooth {
42 compatible = "ti,wl1271-bluetooth-nokia", "nokia,h4p-bluetooth";
43
44 reset-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>; /* gpio26 */
45 host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */
46 bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* gpio37 */
47
48 clocks = <&bluetooth_clk>;
49 clock-names = "sysclk";
50 };
51 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.