overlays: Add pcie-32bit-dma-pi5-overlay to enable 32bit DMA on the Pi 5's external PCIe interface

[RodrigoRosmaninho]

The pcie-32bit-dma dts overlay is only compatible with CM4 and does not work for the Pi 5 and its external PCIe interface.
This PR adds a new overlay "pcie-32bit-dma-pi5-overlay" with a fix based on #4216 and #4870.

In this case, the target component is pcie1, and the dma-ranges attribute changes from:
dma-ranges = <0x03000000 0x10 0x00000000 0x00 0x00000000 0x10 0x00000000>;
to:
dma-ranges = <0x03000000 0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>;
in order to ensure that the DMA addressing space is 32bits, at the expense of having to bounce buffers.

I've confirmed that this functions correctly on a Raspberry Pi 5 connected to Pineberry Pi's "Hat AI!", to which I plugged in a MikroTik R11e-5HnD (Atheros AR9580) wireless card.

Issue Link: #5896

Thanks:

• @vianpl
• @6by9
• @geerlingguy
• Network Architectures and Protocols Group - Instituto de Telecomunicações (Aveiro, Portugal)

[RodrigoRosmaninho]

I have corrected an oversight on my part on the original commit. The dtoverlay workflow check should pass now.
Please let me know if any issues remain.

[schuschu]

Probably sightly off topic, but is it possible to (optionally) also have the MSI vector in the 32 bit address space? Using a slightly newer ath11k card (QCNFA765) this seems to be an issue (Raspberry Pi 5, other cards from intel using iwlwifi and mediatek using mt7921/22 kernel modules work just fine).

[    5.445255] ath11k_pci 0000:01:00.0: BAR 0: assigned [mem 0x1b00000000-0x1b001fffff 64bit]
[    5.445282] ath11k_pci 0000:01:00.0: enabling device (0000 -> 0002)
[    5.445417] ath11k_pci 0000:01:00.0: arch assigned 64-bit MSI address 0xffffffe000 but device only supports 32 bits
[    5.445464] ath11k_pci 0000:01:00.0: failed to enable msi: -22
[    5.446728] ath11k_pci: probe of 0000:01:00.0 failed with error -22

[pelwell]

AFAIK not without restricting the inbound window to the bottom 2GB of RAM: https://github.com/raspberrypi/linux/blob/rpi-6.1.y/drivers/pci/controller/pcie-brcmstb.c#L1269-L1279 (bearing in mind that BARs are power-of-2-sized).