[RFC/RFT PATCH 08/18] PCI: designware: Convert PCI scan API to pci_scan_root_bus_bridge()

[Arnd Bergmann]

On Wed, Apr 26, 2017 at 1:17 PM, Lorenzo Pieralisi
<lorenzo.pieralisi at arm.com> wrote:
> The introduction of pci_scan_root_bus_bridge() provides a PCI core
> API to scan a PCI root bus backed by an already initialized
> struct pci_host_bridge object, which simplifies the bus scan
> interface and makes the PCI scan root bus interface easier to
> generalize as members are added to the struct pci_host_bridge().
>
> Convert PCI designware host code to pci_scan_root_bus_bridge() to
> improve the PCI root bus scanning interface.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> Cc: Jingoo Han <jingoohan1 at gmail.com>
> Cc: Bjorn Helgaas <bhelgaas at google.com>
> Cc: Joao Pinto <Joao.Pinto at synopsys.com>
> ---
>  drivers/pci/dwc/pcie-designware-host.c | 36 +++++++++++++++++++++-------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
> index 5ba3349..e43c21a 100644
> --- a/drivers/pci/dwc/pcie-designware-host.c
> +++ b/drivers/pci/dwc/pcie-designware-host.c
> @@ -294,16 +294,21 @@ int dw_pcie_host_init(struct pcie_port *pp)
>                 dev_err(dev, "missing *config* reg space\n");
>         }
>
> -       ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base);
> +       bridge = pci_alloc_host_bridge(0);
> +       if (!bridge)
> +               return  -ENOMEM;
> +

I think here we warn to have the pci_alloc_host_bridge() called in the
individual
drivers, to have them allocate the dw_pcie structure as part of the host
bridge allocation, before calling hisi_add_pcie_port().

      Arnd