ARM: dts: qcom: msm8974-hammerhead: Add vibrator

The Nexus 5 has a vibrator connected to the clock output of GP1_CLK
which we can use with the clk-pwm driver, then we can use that pwm with
pwm-vibrator to get haptics functionality.

This patch is based on Brian Masney's previous patch with clk-vibrator.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230427-hammerhead-vibra-v1-4-e87eeb94da51@z3ntu.xyz

arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts

@@ -41,6 +41,25 @@ key-volume-down {
 		};
 	};
 
+	clk_pwm: pwm {
+		compatible = "clk-pwm";
+		clocks = <&mmcc CAMSS_GP1_CLK>;
+
+		pinctrl-0 = <&vibrator_pin>;
+		pinctrl-names = "default";
+
+		#pwm-cells = <2>;
+	};
+
+	vibrator {
+		compatible = "pwm-vibrator";
+		pwms = <&clk_pwm 0 100000>;
+		pwm-names = "enable";
+
+		vcc-supply = <&pm8941_l19>;
+		enable-gpios = <&tlmm 60 GPIO_ACTIVE_HIGH>;
+	};
+
 	vreg_wlan: wlan-regulator {
 		compatible = "regulator-fixed";
 
@@ -637,6 +656,22 @@ shutdown-pins {
 			function = "gpio";
 		};
 	};
+
+	vibrator_pin: vibrator-state {
+		core-pins {
+			pins = "gpio27";
+			function = "gp1_clk";
+			drive-strength = <6>;
+			bias-disable;
+		};
+
+		enable-pins {
+			pins = "gpio60";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-disable;
+		};
+	};
 };
 
 &usb {