On Wed, Aug 01, 2018 at 10:38:29AM +0200, Lucas Stach wrote:
> The document "PCI Bus Binding to: IEEE Std 1275-1994 Standard for Boot
> (Initialization Configuration) Firmware" describes how the PCI topology
> can be described in the DT, in order to augment the PCI devices with
> additional information via DT properties.
>
> This patch links OF nodes to the corresponding PCI devices if they
> exist, allowing PCI device drivers to query DT information like any
> platform device.
>
> Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> ---
> drivers/pci/pci.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index b2570eb15181..bd8b7278ef19 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -331,6 +331,31 @@ static void postscan_setup_bridge(struct pci_dev *dev)
> }
> }
>
> +static struct device_node *
> +pci_of_match_device(struct device_d *parent, unsigned int devfn)
> +{
> + struct device_node *np;
> + u32 reg;
> +
> + if (!IS_ENABLED(CONFIG_OFTREE) || !parent->device_node)
> + return NULL;
> +
> + for_each_child_of_node(parent->device_node, np) {
> + if (!of_property_read_u32_array(np, "reg", ®, 1)) {
> + /*
> + * Only match device/function pair of the device
> + * address, other properties are defined by the
> + * PCI/OF node topology.
> + */
> + reg = (reg >> 8) & 0xffff;
> + if (reg == devfn)
> + return np;
> + }
> + }
> +
> + return NULL;
> +}
> +
> unsigned int pci_scan_bus(struct pci_bus *bus)
> {
> struct pci_dev *dev;
> @@ -368,6 +393,11 @@ unsigned int pci_scan_bus(struct pci_bus *bus)
> dev->vendor = l & 0xffff;
> dev->device = (l >> 16) & 0xffff;
> dev->dev.parent = bus->parent;
> + dev->dev.device_node = pci_of_match_device(bus->parent, devfn);
> + if (dev->dev.device_node)
> + pr_debug("found DT node %s for device %04x:%04x\n",
> + dev->dev.device_node->full_name,
> + dev->vendor, dev->device);
>
> /* non-destructively determine if device can be a master: */
> pci_read_config_byte(dev, PCI_COMMAND, &cmd);
> --
> 2.18.0
>
>
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