[PATCH 1/2] ARM: dts: da850-lego-ev3: Add Bluetooth nodes

[David Lechner]

This adds nodes for describing the Bluetooth chip and connections on
LEGO MINDSTORMS EV3 to da850-lego-ev3.dts.

Signed-off-by: David Lechner <da...@lechnology.com>
---
 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