Commit 3db886a5 authored by Bin Meng's avatar Bin Meng Committed by Simon Glass
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serial: ns16550: Support ns16550 compatible pci uart devices

There are many pci uart devices which are ns16550 compatible. We can
describe them in the board dts file and use it as the U-Boot serial
console as specified in the chosen node 'stdout-path' property.

Those pci uart devices can have their register be memory-mapped, or
i/o-mapped. The driver will try to use the memory-mapped register if
the reg property in the node has an entry to describe the memory-mapped
register, otherwise i/o-mapped register will be used.
Signed-off-by: default avatarBin Meng <>
Acked-by: default avatarSimon Glass <>
parent a62e84d7
......@@ -289,7 +289,38 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
struct ns16550_platdata *plat = dev->platdata;
fdt_addr_t addr;
/* try Processor Local Bus device first */
addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
if (addr == FDT_ADDR_T_NONE) {
/* then try pci device */
struct fdt_pci_addr pci_addr;
u32 bar;
int ret;
/* we prefer to use a memory-mapped register */
ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
if (ret) {
/* try if there is any i/o-mapped register */
ret = fdtdec_get_pci_addr(gd->fdt_blob,
"reg", &pci_addr);
if (ret)
return ret;
ret = fdtdec_get_pci_bar32(gd->fdt_blob, dev->of_offset,
&pci_addr, &bar);
if (ret)
return ret;
addr = bar;
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
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