Hi,
On Wed, Nov 12, 2014 at 12:47 AM, <suravee.suthikulpanit@xxxxxxx> wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> This patch introduces a new DT binding, msi-parent, which can
> be used to specify MSI-parent phandle for a particular PCI
> generic host controller.
>
> Also, it implements and registers set_msi_parent callback.
>
> Cc: Bjorn Helgass <bhelgaas@xxxxxxxxxx>
> Cc: Liviu Dudau <liviu.dudau@xxxxxxx>
> Cc: Will Deacon <will.deacon@xxxxxxx>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> ---
> Documentation/devicetree/bindings/pci/host-generic-pci.txt | 3 +++
> drivers/pci/host/pci-host-generic.c | 13 +++++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
> index cf3e205..6996af7 100644
> --- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt
> +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
> @@ -36,6 +36,8 @@ Properties of the host controller node:
> - reg : The Configuration Space base address and size, as accessed
> from the parent bus.
>
> +- msi-parent : Specify the phandle of the corresponded MSI controller
> + for this PCI host controller.
>
> Properties of the /chosen node:
>
> @@ -77,6 +79,7 @@ pci {
> device_type = "pci";
> #address-cells = <3>;
> #size-cells = <2>;
> + msi-parent = <&msictrl0>;
> bus-range = <0x0 0x1>;
>
> // CPU_PHYSICAL(2) SIZE(2)
> diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> index 1895907..c4fbcda 100644
> --- a/drivers/pci/host/pci-host-generic.c
> +++ b/drivers/pci/host/pci-host-generic.c
> @@ -42,6 +42,7 @@ struct gen_pci {
> struct pci_host_bridge host;
> struct gen_pci_cfg_windows cfg;
> struct list_head resources;
> + struct msi_chip *mchip;
> };
>
> static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
> @@ -122,9 +123,19 @@ static int gen_pci_config_write(struct pci_bus *bus, unsigned int devfn,
> return PCIBIOS_SUCCESSFUL;
> }
>
> +static int gen_pci_set_msi_parent(struct pci_bus *bus)
> +{
> + struct gen_pci *pci = bus_to_gen_pci(bus);
> +
> + bus->msi = pci->mchip;
> +
> + return PCIBIOS_SUCCESSFUL;
> +}
> +
> static struct pci_ops gen_pci_ops = {
> .read = gen_pci_config_read,
> .write = gen_pci_config_write,
> + .set_msi_parent = gen_pci_set_msi_parent,
We assign the msi chip through add_bus() call, do we still need this?
Srikanth
> };
>
> static const struct of_device_id gen_pci_of_match[] = {
> @@ -303,6 +314,8 @@ static int gen_pci_probe(struct platform_device *pdev)
> return err;
> }
>
> + pci->mchip = of_pci_find_msi_chip_by_node(of_parse_phandle(np,
> + "msi-parent", 0));
> pci_common_init_dev(dev, &hw);
> return 0;
> }
> --
> 1.9.3
>
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