ARM: dts: qcom: msm8974-hammerhead: add device tree bindings for mpu6515

This patch adds device tree bindings for the mpu6515 to the LG Nexus 5
(hammerhead) phone. Confirmed that the gyroscope / accelerometer
(mpu6515), magnetometer (ak8963), and temperature / pressure (bmp280)
sensors are available on the phone.

Interrupts are not working properly on the ak8963 magnetometer so they
are currently not configured.

The bmp280 retuns temperature/pressure measurement skipped errors but
will reliably work if I run:

    echo 1 > in_pressure_oversampling_ratio
    echo 1 > in_temp_oversampling_ratio

Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

2 files changed, 67 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
index c2dc9d09484a..928affae1885 100644
--- a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
+++ b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
@@ -241,6 +241,24 @@
                                 bias-pull-up;
                         };
                 };
+
+                i2c12_pins: i2c12 {
+                        mux {
+                                pins = "gpio87", "gpio88";
+                                function = "blsp_i2c12";
+                                drive-strength = <2>;
+                                bias-disable;
+                        };
+                };
+
+                mpu6515_pin: mpu6515 {
+                        irq {
+                                pins = "gpio73";
+                                function = "gpio";
+                                bias-disable;
+                                input-enable;
+                        };
+                };
         };
 
         sdhci@f9824900 {
@@ -277,6 +295,44 @@
                         linux,code = <KEY_VOLUMEDOWN>;
                 };
         };
+
+        i2c@f9968000 {
+                status = "ok";
+                pinctrl-names = "default";
+                pinctrl-0 = <&i2c12_pins>;
+                clock-frequency = <100000>;
+                qcom,src-freq = <50000000>;
+
+                mpu6515@68 {
+                        compatible = "invensense,mpu6515";
+                        reg = <0x68>;
+                        interrupts-extended = <&msmgpio 73 IRQ_TYPE_EDGE_FALLING>;
+                        vddio-supply = <&pm8941_lvs1>;
+
+                        pinctrl-names = "default";
+                        pinctrl-0 = <&mpu6515_pin>;
+
+                        i2c-gate {
+                                #address-cells = <1>;
+                                #size-cells = <0>;
+                                ak8963@f {
+                                        compatible = "asahi-kasei,ak8963";
+                                        reg = <0x0f>;
+                                        // Currently only works in polling mode.
+                                        // gpios = <&msmgpio 61 0>;
+                                        vid-supply = <&pm8941_lvs1>;
+                                        vdd-supply = <&pm8941_l17>;
+                                };
+
+                                bmp280@76 {
+                                        compatible = "bosch,bmp280";
+                                        reg = <0x76>;
+                                        vdda-supply = <&pm8941_lvs1>;
+                                        vddd-supply = <&pm8941_l17>;
+                                };
+                        };
+                };
+        };
 };
 
 &spmi_bus {
diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
index 9550f0612918..439ca8c3a8b4 100644
--- a/arch/arm/boot/dts/qcom-msm8974.dtsi
+++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
@@ -739,6 +739,17 @@
                         dma-names = "tx", "rx";
                 };
 
+                blsp_i2c12: i2c@f9968000 {
+                        status = "disabled";
+                        compatible = "qcom,i2c-qup-v2.1.1";
+                        reg = <0xf9968000 0x1000>;
+                        interrupts = <0 106 IRQ_TYPE_NONE>;
+                        clocks = <&gcc GCC_BLSP2_QUP6_I2C_APPS_CLK>, <&gcc GCC_BLSP2_AHB_CLK>;
+                        clock-names = "core", "iface";
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                };
+
                 spmi_bus: spmi@fc4cf000 {
                         compatible = "qcom,spmi-pmic-arb";
                         reg-names = "core", "intr", "cnfg";