summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/pci
diff options
context:
space:
mode:
authorAaron Sierra <asierra@xes-inc.com>2014-08-26 16:46:11 -0500
committerScott Wood <scottwood@freescale.com>2014-09-03 18:51:23 -0500
commit00406e8772c61feb57c1baeb97531aa199614e65 (patch)
tree0f2cba34a08b3704405abf251a037784bafeea1b /Documentation/devicetree/bindings/pci
parent7b0e6d6f6de5916aee2a972a4e3a622009b9743a (diff)
downloadop-kernel-dev-00406e8772c61feb57c1baeb97531aa199614e65.zip
op-kernel-dev-00406e8772c61feb57c1baeb97531aa199614e65.tar.gz
powerpc: fsl_pci: Add forced PCI Agent enumeration
The following commit prevents the MPC8548E on the XPedite5200 PrPMC module from enumerating its PCI/PCI-X bus: powerpc/fsl-pci: use 'Header Type' to identify PCIE mode The previous patch prevents any Freescale PCI-X bridge from enumerating the bus, if it is hardware strapped into Agent mode. In PCI-X, the Host is responsible for driving the PCI-X initialization pattern to devices on the bus, so that they know whether to operate in conventional PCI or PCI-X mode as well as what the bus timing will be. For a PCI-X PrPMC, the pattern is driven by the mezzanine carrier it is installed onto. Therefore, PrPMCs are PCI-X Agents, but one per system may still enumerate the bus. This patch causes the device node of any PCI/PCI-X bridge strapped into Agent mode to be checked for the fsl,pci-agent-force-enum property. If the property is present in the node, the bridge will be allowed to enumerate the bus. Cc: Minghuan Lian <Minghuan.Lian@freescale.com> Signed-off-by: Aaron Sierra <asierra@xes-inc.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'Documentation/devicetree/bindings/pci')
-rw-r--r--Documentation/devicetree/bindings/pci/fsl,pci.txt27
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pci/fsl,pci.txt b/Documentation/devicetree/bindings/pci/fsl,pci.txt
new file mode 100644
index 0000000..d8ac4a7
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/fsl,pci.txt
@@ -0,0 +1,27 @@
+* Bus Enumeration by Freescale PCI-X Agent
+
+Typically any Freescale PCI-X bridge hardware strapped into Agent mode
+is prevented from enumerating the bus. The PrPMC form-factor requires
+all mezzanines to be PCI-X Agents, but one per system may still
+enumerate the bus.
+
+The property defined below will allow a PCI-X bridge to be used for bus
+enumeration despite being strapped into Agent mode.
+
+Required properties:
+- fsl,pci-agent-force-enum : There is no value associated with this
+ property. The property itself is treated as a boolean.
+
+Example:
+
+ /* PCI-X bridge known to be PrPMC Monarch */
+ pci0: pci@ef008000 {
+ fsl,pci-agent-force-enum;
+ #interrupt-cells = <1>;
+ #size-cells = <2>;
+ #address-cells = <3>;
+ compatible = "fsl,mpc8540-pcix", "fsl,mpc8540-pci";
+ device_type = "pci";
+ ...
+ ...
+ };
OpenPOWER on IntegriCloud