mwifiex: parse device tree node for PCIe

This patch derives device tree node from pcie bus layer framework.
Device tree bindings file has been renamed(marvell-sd8xxx.txt ->
marvell-8xxx.txt) to accommodate PCIe changes.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Rajat Jain <rajatja@google.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Documentation/devicetree/bindings/net/wireless/marvell-8xxx.txt

@@ -1,8 +1,8 @@
-Marvell 8897/8997 (sd8897/sd8997) SDIO devices
+Marvell 8897/8997 (sd8897/sd8997/pcie8997) SDIO/PCIE devices
 ------
 
-This node provides properties for controlling the marvell sdio wireless device.
-The node is expected to be specified as a child node to the SDIO controller that
+This node provides properties for controlling the Marvell SDIO/PCIE wireless device.
+The node is expected to be specified as a child node to the SDIO/PCIE controller that
 connects the device to the system.
 
 Required properties:
@@ -10,6 +10,8 @@ Required properties:
   - compatible : should be one of the following:
 	* "marvell,sd8897"
 	* "marvell,sd8997"
+	* "pci11ab,2b42"
+	* "pci1b4b,2b42"
 
 Optional properties:
 

drivers/net/wireless/marvell/mwifiex/pcie.c

@@ -37,6 +37,22 @@ static struct mwifiex_if_ops pcie_ops;
 
 static struct semaphore add_remove_card_sem;
 
+static const struct of_device_id mwifiex_pcie_of_match_table[] = {
+	{ .compatible = "pci11ab,2b42" },
+	{ .compatible = "pci1b4b,2b42" },
+	{ }
+};
+
+static int mwifiex_pcie_probe_of(struct device *dev)
+{
+	if (!of_match_node(mwifiex_pcie_of_match_table, dev->of_node)) {
+		dev_err(dev, "required compatible string missing\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int
 mwifiex_map_pci_memory(struct mwifiex_adapter *adapter, struct sk_buff *skb,
 		       size_t size, int flags)
@@ -185,6 +201,7 @@ static int mwifiex_pcie_probe(struct pci_dev *pdev,
 					const struct pci_device_id *ent)
 {
 	struct pcie_service_card *card;
+	int ret;
 
 	pr_debug("info: vendor=0x%4.04X device=0x%4.04X rev=%d\n",
 		 pdev->vendor, pdev->device, pdev->revision);
@@ -206,6 +223,13 @@ static int mwifiex_pcie_probe(struct pci_dev *pdev,
 		card->pcie.can_ext_scan = data->can_ext_scan;
 	}
 
+	/* device tree node parsing and platform specific configuration*/
+	if (pdev->dev.of_node) {
+		ret = mwifiex_pcie_probe_of(&pdev->dev);
+		if (ret)
+			return ret;
+	}
+
 	if (mwifiex_add_card(card, &add_remove_card_sem, &pcie_ops,
 			     MWIFIEX_PCIE)) {
 		pr_err("%s failed\n", __func__);

drivers/net/wireless/marvell/mwifiex/sta_cmd.c

@@ -2235,7 +2235,8 @@ int mwifiex_sta_init_cmd(struct mwifiex_private *priv, u8 first_sta, bool init)
 		 * The cal-data can be read from device tree and/or
 		 * a configuration file and downloaded to firmware.
 		 */
-		if (priv->adapter->iface_type == MWIFIEX_SDIO &&
+		if ((priv->adapter->iface_type == MWIFIEX_SDIO ||
+		    priv->adapter->iface_type == MWIFIEX_PCIE) &&
 		    adapter->dev->of_node) {
 			adapter->dt_node = adapter->dev->of_node;
 			if (of_property_read_u32(adapter->dt_node,