From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fnItR-0007TI-JQ for barebox@lists.infradead.org; Wed, 08 Aug 2018 07:28:31 +0000 Date: Wed, 8 Aug 2018 09:28:17 +0200 From: Sascha Hauer Message-ID: <20180808072817.qmxea4km7vbytvp3@pengutronix.de> References: <20180801083831.12983-1-l.stach@pengutronix.de> <20180801083831.12983-2-l.stach@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20180801083831.12983-2-l.stach@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH 1/3] PCI: link PCI devices with potentially existing OF nodes To: Lucas Stach Cc: barebox@lists.infradead.org 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 > --- > 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 > > > _______________________________________________ > barebox mailing list > barebox@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/barebox > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox