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MSM MHI DEV
MSM MHI DEV enables communication with the host over a PCIe link using the
Modem Host Interface protocol. The driver interfaces with the IPA for
enabling the HW acceleration channel path and provides interface for
software channels to communicate between Host and device.
Required properties:
- compatible: should be "qcom,msm-mhi-dev" for MHI device driver.
- reg: MHI MMIO physical register space.
- reg-names: resource names used for the MHI MMIO physical address region,
IPA uC command and event ring doorbell mail box address.
Should be "mhi_mmio_base" for MHI MMIO physical address,
"ipa_uc_mbox_crdb" for IPA uC Command Ring doorbell,
"ipa_uc_mbox_erdb" for IPA uC Event Ring doorbell passed to
the IPA driver.
- qcom,mhi-ifc-id: ID of HW interface via which MHI on device side
communicates with host side.
- qcom,mhi-ep-msi: End point MSI number.
- qcom,mhi-version: MHI specification version supported by the device.
Optional property:
- qcom,use-mhi-dma-software-channel: If property is present use IPA hardware
accelerated path for MHI software channel data transfers
between host and device.
- qcom,mhi-config-iatu: If property is present map the control and data region
between host and device using iatu.
- qcom,mhi-interrupt: If property is present register for mhi interrupt.
- qcom,mhi-local-pa-base: The physical base address on the device used by the
MHI device driver to map the control and data region with the
MHI driver on the host. This property is required if iatu
property qcom,mhi-config-iatu is present.
- qcom,enable-m2: If property is present M2 autonomous is enabled.
MSM MHI DEV NET
MSM MHI DEV enables communication with the host over a PCIe link using the
Network Interface.
Required properties:
- compatible: should be "qcom,msm-mhi-dev-net" for MHI net device driver.
Optional property:
- qcom,mhi-ethernet-interface;: If property is present use ethernet packet
parsing support.
- qcom,tx_rx_reqs: If property present it will override the number of elements
in rx and tx queues for mhi_dev_net device.(Default:128)
Example:
mhi: qcom,msm-mhi-dev {
compatible = "qcom,msm-mhi-dev";
reg = <0xfc527000 0x1000>,
<0xfd4fa000 0x1>,
<0xfd4fa080 0x1>;
reg-names = "mhi_mmio_base", "ipa_uc_mbox_crdb",
"ipa_uc_mbox_erdb";
qcom,mhi-ifc-id = <0x030017cb>;
qcom,mhi-ep-msi = <1>;
qcom,mhi-version = <0x1000000>;
};
qcom,mhi_net_dev {
compatible = "qcom,msm-mhi-dev-net";
qcom,mhi-ethernet-interface;
};
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