linux-kernel - [RFC PATCH v11 2/5] of/irq: Adjust of_pci

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Date:   Mon, 25 Dec 2017 19:47:39 +0800
From:   Jeffy Chen <jeffy.chen@...k-chips.com>
To:     linux-kernel@...r.kernel.org, bhelgaas@...gle.com
Cc:     linux-pm@...r.kernel.org, tony@...mide.com,
        shawn.lin@...k-chips.com, briannorris@...omium.org,
        rjw@...ysocki.net, dianders@...omium.org,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Subject: [RFC PATCH v11 2/5] of/irq: Adjust of_pci_irq parsing for multiple interrupts

Currently we are considering the first irq as the PCI interrupt pin,
but a PCI device may have multiple interrupts(e.g. PCIe WAKE# pin).

Only parse the PCI interrupt pin when the irq is unnamed or named as
"pci".

Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
---

Changes in v11:
Address Brian's comments.

Changes in v10: None
Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v3: None
Changes in v2: None

 drivers/of/of_pci_irq.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c
index 3a05568f65df..d39565d5477b 100644
--- a/drivers/of/of_pci_irq.c
+++ b/drivers/of/of_pci_irq.c
@@ -27,9 +27,25 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq
 	 */
 	dn = pci_device_to_OF_node(pdev);
 	if (dn) {
-		rc = of_irq_parse_one(dn, 0, out_irq);
-		if (!rc)
-			return rc;
+		struct property *prop;
+		const char *name;
+		int index = 0;
+
+		of_property_for_each_string(dn, "interrupt-names", prop, name) {
+			if (!strcmp(name, "pci"))
+				break;
+			index++;
+		}
+
+		/*
+		 * Only parse from DT if we have no "interrupt-names",
+		 * or if we found an interrupt named "pci".
+		 */
+		if (index == 0 || name) {
+			rc = of_irq_parse_one(dn, index, out_irq);
+			if (!rc)
+				return rc;
+		}
 	}
 
 	/* Ok, we don't, time to have fun. Let's start by building up an
-- 
2.11.0