diff options
Diffstat (limited to 'doc/device-tree-bindings/pci/x86-pci.txt')
| -rw-r--r-- | doc/device-tree-bindings/pci/x86-pci.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/pci/x86-pci.txt b/doc/device-tree-bindings/pci/x86-pci.txt index 3aa5bd9a46..95e370b3e7 100644 --- a/doc/device-tree-bindings/pci/x86-pci.txt +++ b/doc/device-tree-bindings/pci/x86-pci.txt @@ -10,6 +10,17 @@ Optional properties: configuration in TPL/SPL to reduce code size and boot time, since these phases only know about a small subset of PCI devices. +For PCI devices the following optional property is available: + +- pci,no-autoconfig : Don't automatically configure this PCI device at all. + This is used when the device is statically configured and must maintain + this same config throughout the boot process. An example is a serial + UART being used to debug PCI configuration, since reconfiguring it stops + the UART from working until the driver is re-probed, and this can cause + output to be lost. This should not generally be used in production code, + although it is often harmless. + + Example: pci { @@ -21,4 +32,16 @@ pci { 0x42000000 0x0 0xb0000000 0xb0000000 0 0x10000000 0x01000000 0x0 0x1000 0x1000 0 0xefff>; u-boot,skip-auto-config-until-reloc; + + + serial: serial@18,2 { + reg = <0x0200c210 0 0 0 0>; + u-boot,dm-pre-reloc; + compatible = "intel,apl-ns16550"; + early-regs = <0xde000000 0x20>; + reg-shift = <2>; + clock-frequency = <1843200>; + current-speed = <115200>; + pci,no-autoconfig; + }; }; |