52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
|
Nokia Bluetooth Chips
|
||
|
|
---------------------
|
||
|
|
|
||
|
|
Nokia phones often come with UART connected bluetooth chips from different
|
||
|
|
vendors and modified device API. Those devices speak a protocol named H4+
|
||
|
|
(also known as h4p) by Nokia, which is similar to the H4 protocol from the
|
||
|
|
Bluetooth standard. In addition to the H4 protocol it specifies two more
|
||
|
|
UART status lines for wakeup of UART transceivers to improve power management
|
||
|
|
and a few new packet types used to negotiate uart speed.
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
|
||
|
|
- compatible: should contain "nokia,h4p-bluetooth" as well as one of the following:
|
||
|
|
* "brcm,bcm2048-nokia"
|
||
|
|
* "ti,wl1271-bluetooth-nokia"
|
||
|
|
- reset-gpios: GPIO specifier, used to reset the BT module (active low)
|
||
|
|
- bluetooth-wakeup-gpios: GPIO specifier, used to wakeup the BT module (active high)
|
||
|
|
- host-wakeup-gpios: GPIO specifier, used to wakeup the host processor (active high)
|
||
|
|
- clock-names: should be "sysclk"
|
||
|
|
- clocks: should contain a clock specifier for every name in clock-names
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
|
||
|
|
- None
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
/ {
|
||
|
|
/* controlled (enabled/disabled) directly by BT module */
|
||
|
|
bluetooth_clk: vctcxo {
|
||
|
|
compatible = "fixed-clock";
|
||
|
|
#clock-cells = <0>;
|
||
|
|
clock-frequency = <38400000>;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
&uart2 {
|
||
|
|
pinctrl-names = "default";
|
||
|
|
pinctrl-0 = <&uart2_pins>;
|
||
|
|
|
||
|
|
bluetooth {
|
||
|
|
compatible = "ti,wl1271-bluetooth-nokia", "nokia,h4p-bluetooth";
|
||
|
|
|
||
|
|
reset-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>; /* gpio26 */
|
||
|
|
host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */
|
||
|
|
bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* gpio37 */
|
||
|
|
|
||
|
|
clocks = <&bluetooth_clk>;
|
||
|
|
clock-names = "sysclk";
|
||
|
|
};
|
||
|
|
};
|