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What should the DEVICE_TYPE mode setting be for PCIe root complex?

Question asked by Tyler Sheffield on Apr 19, 2016
Latest reply on Apr 25, 2016 by Norbel Navarro

For the iMX6SDL, the Linux PCIe driver sets the DEVICE_TYPE in GPR12 to 0x4 for RC mode: // set device type to RC (PCI_EXP_TYPE_ROOT_PORT=4 is from pcie_regs.h)

imx_pcie_clrset(iomuxc_gpr12_device_type, PCI_EXP_TYPE_ROOT_PORT << 12, IOMUXC_GPR12

);

 

This seems odd since the ref manual says that 0x2 is the proper value for RC mode:

0000 PCIE_EP — EP Mode

0010 PCIE_RC — RC Mode

 

Can anyone explain why that it is?  And how it is that it works that way?  Wondering what setting I should use for an RTOS version of the driver I'm creating.

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