* Qualcomm SSBI Some Qualcomm MSM devices contain a point-to-point serial bus used to communicate with a limited range of devices (mostly power management chips). These require the following properties: - compatible: "qcom,ssbi" - qcom,controller-type indicates the SSBI bus variant the controller should use to talk with the slave device. This should be one of "ssbi", "ssbi2", or "pmic-arbiter". The type chosen is determined by the attached slave. The slave device should be the single child node of the ssbi device with a compatible field.