[coreboot-gerrit] Change in coreboot[master]: soc/mediatek: Add PCIe support

[Arthur Heymans (Code Review)]

Attention is currently required from: Shelley Chen, Hung-Te Lin, Furquan Shaikh, Angel Pons, Yu-Ping Wu, Jianjun Wang.
Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56791 )

Change subject: soc/mediatek: Add PCIe support
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Patch Set 9:

(2 comments)

File src/soc/mediatek/common/pcie.c:

https://review.coreboot.org/c/coreboot/+/56791/comment/c142268b_48994d95 
PS2, Line 329: mtk_pcie_gen3_probe
> Sorry for the late response, the device_operations has been used by soc_ops, can we still add this pci_domain_ops?

Do you have a domain in the devicetree? You can set the soc & pci_domain_ops like this:

static void enable_soc_dev(struct device *dev)
{
    /* Set the operations if it is a special bus type */
    if (dev->path.type == DEVICE_PATH_DOMAIN)
    	dev->ops = &pci_domain_ops;
    else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER)
    	dev->ops = &soc_ops;
}

File src/soc/mediatek/common/pcie.c:

https://review.coreboot.org/c/coreboot/+/56791/comment/36075047_e41ffe5e 
PS9, Line 108: pcie_ctrl->base + PCIE_CFG_OFFSET_ADDR;
             : }
void pointer aritmetic is undefined behavior is C.