On Tue, Aug 30, 2016 at 02:57:09PM +0200, Thomas Petazzoni wrote:
> The Designware PCIe controllers have a built-in MSI controller, which is
> already supported by the existing. However, in some situations, it might
^ driver.
> be a better choice to use an external MSI controller, especially when it
> provides a higher number of MSI interrupts than the built-in one.
>
> Therefore, this commit extends the pcie-designware driver to support the
> "msi-parent" DT property, already used by other drivers. It contains a
> phandle pointing to the external MSI controller to be used.
>
> Following this commit, the pcie-designware code supports three
> possibilities, in this order:
>
> 1. If msi-parent is provided, then the MSI controller pointed by this
^ to
> property is used.
> if (IS_ENABLED(CONFIG_PCI_MSI)) {
> - if (!pp->ops->msi_host_init) {
> + if (of_find_property(pp->dev->of_node, "msi-parent", NULL)) {
> + struct device_node *msi_node;
> +
> + msi_node = of_parse_phandle(pp->dev->of_node,
> + "msi-parent", 0);
> + if (!msi_node)
> + return -ENODEV;
> +
> + msi = of_pci_find_msi_chip_by_node(msi_node);
By this point, device tree tells us the external MSI controller
should exist. So if we get a NULL here, should we not return
-EPROBE_DIFFERED?
Andrew
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