Interfacing RM500Q-GL quectel modem on RZG2N custome board using PCIE interface

Question

Hi Renesas Team, 
 I hope this message finds you well. 
 We are working on a custom board design based on the RZG2N, where we are interfacing the RM500Q-GL Quectel modem via the PCIe interface. We have integrated the pcie-mhi driver provided by Quectel into our kernel and successfully loaded the pci_mhi.ko module. 
 We have enabled the following entries in the r8a774b1-hihope-rzg2n-ex.dts file: 
 
 &pciec0 { 
 status = "okay"; 
 }; 
 &pciec1 { 
 status = "okay"; 
 }; 
 
 Despite this, the lspci command does not list any PCI devices, indicating that the PCIe interface is not detecting the modem. We would greatly appreciate your guidance on what might be missing or how we can successfully bring up the PCIe interface on the RZG2N to interface with the modem. 
 I have been unable to find detailed documentation on enabling the PCIe interface on the RZG2N, so any assistance or pointers to relevant resources would be invaluable. 
 
 PCIe Hardware setting. 
 In RZ/G2N boot Mode setting is taken care MD12 is made Zero. 
 
 We are testing Both the PCIe 0 and PCIe 1 interface on RZ/G2N, Both PCIe interface is not working. 
 Tested the PCIe clock on ( PCIE_REFCLK_M/P to PCIe model) and (PCIE_CLK_P/M on RZ/G2N) 100MHZ clock is coming correctly .

Thank you in advance for your support. 
 
 Thanks and Regards, 
 Nagaraja

Chris · Answer

By default, the PCIe driver should be enabled in the default Renesas BSP. 
 
 https://github.com/renesas-rz/rz_linux-cip/blob/rzv2h-5.10-cip17/arch/arm64/configs/defconfig#L105 
 CONFIG_PCIE_RCAR_HOST=y CONFIG_PCIE_RCAR_EP=y 
 So if you enabled it in your Device Tree, it should be OK.

Interfacing RM500Q-GL quectel modem on RZG2N custome board using PCIE interface

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