Hello,
i've following trouble on a new custom zynq board:
There is a axi4pcie root-complex implemented within the FPGA, i added
this to my devicetree:
pci_express: axi-pcie@90000000 {
#address-cells = <3>;
#size-cells = <2>;
#interrupt-cells = <1>;
status = "disabled";
compatible = "xlnx,axi-pcie-host-1.00.a";
reg = < 0x90000000 0x1000000 >;
device_type = "pci";
interrupts = < 0 116 4 >;
interrupt-map-mask = <0 0 0 7>;
interrupt-map = <0 0 0 1 &pcie_intc 1>,
<0 0 0 2 &pcie_intc 2>,
<0 0 0 3 &pcie_intc 3>,
<0 0 0 4 &pcie_intc 4>;
ranges = < 0x02000000 0 0x80000000 0x80000000 0 0x10000000 >;
pcie_intc: interrupt-controller {
interrupt-controller;
#address-cells = <0>;
#interrupt-cells = <1>;
};
};
As you can see the node is "disabled". For me this makes sense since
during very first come up of u-boot the FPGA is not configured yet and
the registers of the root-complex aren't accessible.
Later on, during "board_init(...)" i bring up the FPGA (load bitstream
from spi flash into FPGA) and set the fdt-node property status to "okay".
Trouble is that dm-scan, probe, ... is already done at this point and
the root-complex is left ofter uninitialized and is not in the dm-tree
at all (since it was disabled through first scan).
=> dm tree
Class Probed Name
----------------------------------------
root [ + ] root_driver
simple_bus [ + ] `-- amba
gpio [ + ] |-- gpio@e000a000
i2c [ ] |-- i2c@e0004000
i2c [ + ] |-- i2c@e0005000
i2c_generic [ + ] | `-- generic_60
serial [ + ] |-- serial@e0000000
serial [ ] |-- serial@e0001000
spi [ + ] |-- spi@e000d000
spi_flash [ + ] | `-- spiflash@0
eth [ ] |-- ethernet@e000b000
mmc [ + ] |-- sdhci@e0100000
blk [ ] | `-- sd...@e0100000.blk
mmc [ + ] |-- sdhci@e0101000
blk [ ] | `-- sd...@e0101000.blk
simple_bus [ ] |-- slcr@f8000000
usb [ ] `-- usb@e0003000
=>
Is there a possibility to trigger a dm-scan after bringing up such new
devices ?
Or is it the wrong way having the node "disabled" first and enabled it
later ? are there better ways to prevent accessing not yet ready devices
from access ?
many thanks for your help and
best regards,
Hannes
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