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pci: sandbox: Support dynamically binding device driver

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At present all emulated sandbox pci devices must be present in the
device tree in order to be used. The real world pci uclass driver
supports pci device driver matching, and we should add such support
on sandbox too.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng
2018-08-03 01:14:45 -07:00
committed by Simon Glass
parent ed698aa7de
commit 4345998ae9
4 changed files with 112 additions and 11 deletions
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28
doc/driver-model/pci-info.txt
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@@ -133,3 +133,31 @@ When this bus is scanned we will end up with something like this:
When accesses go to the pci@1f,0 device they are forwarded to its child, the
emulator.
The sandbox PCI drivers also support dynamic driver binding, allowing device
driver to declare the driver binding information via U_BOOT_PCI_DEVICE(),
eliminating the need to provide any device tree node under the host controller
node. It is required a "sandbox,dev-info" property must be provided in the
host controller node for this functionality to work.
pci1: pci-controller1 {
compatible = "sandbox,pci";
...
sandbox,dev-info = <0x08 0x00 0x1234 0x5678
0x0c 0x00 0x1234 0x5678>;
};
The "sandbox,dev-info" property specifies all dynamic PCI devices on this bus.
Each dynamic PCI device is encoded as 4 cells a group. The first and second
cells are PCI device number and function number respectively. The third and
fourth cells are PCI vendor ID and device ID respectively.
When this bus is scanned we will end up with something like this:
pci [ + ] pci_sandbo |-- pci-controller1
pci_emul [ ] sandbox_sw | |-- sandbox_swap_case_emul
pci_emul [ ] sandbox_sw | `-- sandbox_swap_case_emul
Note the difference from the statically declared device nodes is that the
device is directly attached to the host controller, instead of via a container
device like pci@1f,0.