Re: [PATCH 1/3] PCI: link PCI devices with potentially existing OF nodes

[Sascha Hauer <s.hauer@pengutronix.de>]

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@pengutronix.de>
> ---
>  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", &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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