This adds nodes for describing the Bluetooth chip and connections on
LEGO MINDSTORMS EV3 to da850-lego-ev3.dts.
Signed-off-by: David Lechner <david@xxxxxxxxxxxxxx>
---
arch/arm/boot/dts/da850-lego-ev3.dts | 82 ++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts
index bef42dc78817..fe4cc87394b9 100644
--- a/arch/arm/boot/dts/da850-lego-ev3.dts
+++ b/arch/arm/boot/dts/da850-lego-ev3.dts
@@ -187,6 +187,15 @@
rechargeable-gpios = <&gpio 136 GPIO_ACTIVE_LOW>;
};
+ bt_slow_clk: bt-clock {
+ pinctrl-names = "default";
+ pinctrl-0 = <&ecap2_pins>, <&bt_clock_bias>;
+ compatible = "pwm-clock";
+ #clock-cells = <0>;
+ clock-frequency = <32768>;
+ pwms = <&ecap2 0 30518 0>;
+ };
+
/* ARM local RAM */
memory@ffff0000 {
compatible = "syscon", "simple-mfd";
@@ -251,6 +260,20 @@
bias-disable;
};
};
+
+ bt_clock_bias: bt-clock-bias-groups {
+ disable {
+ groups = "cp2";
+ bias-disable;
+ };
+ };
+
+ bt_pic_bias: bt-pic-bias-groups {
+ disable {
+ groups = "cp20";
+ bias-disable;
+ };
+ };
};
/* Input port 1 */
@@ -260,6 +283,22 @@
pinctrl-0 = <&serial1_rxtx_pins>;
};
+&serial2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&serial2_rxtx_pins>, <&serial2_rtscts_pins>, <&bt_pic_bias>;
+ status = "okay";
+
+ bluetooth {
+ compatible = "ti,cc2560";
+ clocks = <&bt_slow_clk>;
+ clock-names = "ext_clock";
+ enable-gpios = <&gpio 73 GPIO_ACTIVE_HIGH>;
+ max-speed = <2000000>;
+ nvmem-cells = <&bdaddr>;
+ nvmem-cell-names = "bd-address";
+ };
+};
+
&rtc0 {
status = "okay";
};
@@ -278,6 +317,12 @@
pagesize = <64>;
read-only;
reg = <0x50>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ bdaddr: bdaddr@3f06 {
+ reg = <0x3f06 0x06>;
+ };
};
};
@@ -362,6 +407,10 @@
};
};
+&ecap2 {
+ status = "okay";
+};
+
&ehrpwm0 {
status = "okay";
};
@@ -375,6 +424,39 @@
gpios = <6 GPIO_ACTIVE_HIGH>;
output-high;
};
+
+ /* Don't impede Bluetooth clock signal */
+ bt_clock_en {
+ gpio-hog;
+ gpios = <5 GPIO_ACTIVE_HIGH>;
+ input;
+ };
+
+ /*
+ * There is a PIC microcontroller for interfacing with an Apple MFi
+ * chip. This interferes with normal Bluetooth operation, so we need
+ * to make sure it is turned off. Note: The publicly available
+ * schematics from LEGO don't show that these pins are connected to
+ * anything, but they are present in the source code from LEGO.
+ */
+
+ bt_pic_en {
+ gpio-hog;
+ gpios = <51 GPIO_ACTIVE_HIGH>;
+ output-low;
+ };
+
+ bt_pic_rst {
+ gpio-hog;
+ gpios = <78 GPIO_ACTIVE_HIGH>;
+ output-high;
+ };
+
+ bt_pic_cts {
+ gpio-hog;
+ gpios = <87 GPIO_ACTIVE_HIGH>;
+ input;
+ };
};
&usb_phy {
--
2.17.0
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
