linux-kernel - [PATCH] of: property: Add device link support for interrupts

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Message-Id: <20201218210750.3455872-1-saravanak@google.com>
Date:   Fri, 18 Dec 2020 13:07:50 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Kevin Hilman <khilman@...libre.com>, kernel-team@...roid.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] of: property: Add device link support for interrupts

Add support for creating device links out of interrupts property.

Cc: Marc Zyngier <maz@...nel.org>
Cc: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
Rob/Greg,

This might need to go into driver-core to avoid conflict
due to fw_devlink refactor series that merged there.

Thanks,
Saravana


 drivers/of/property.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 5f9eed79a8aa..e56a5eae0a0b 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1271,6 +1271,22 @@ static struct device_node *parse_iommu_maps(struct device_node *np,
 	return of_parse_phandle(np, prop_name, (index * 4) + 1);
 }
 
+static struct device_node *parse_interrupts(struct device_node *np,
+					    const char *prop_name, int index)
+{
+	struct device_node *sup;
+
+	if (strcmp(prop_name, "interrupts") || index)
+		return NULL;
+
+	of_node_get(np);
+	while (np && !(sup = of_parse_phandle(np, "interrupt-parent", 0)))
+		np = of_get_next_parent(np);
+	of_node_put(np);
+
+	return sup;
+}
+
 static const struct supplier_bindings of_supplier_bindings[] = {
 	{ .parse_prop = parse_clocks, },
 	{ .parse_prop = parse_interconnects, },
@@ -1296,6 +1312,7 @@ static const struct supplier_bindings of_supplier_bindings[] = {
 	{ .parse_prop = parse_pinctrl6, },
 	{ .parse_prop = parse_pinctrl7, },
 	{ .parse_prop = parse_pinctrl8, },
+	{ .parse_prop = parse_interrupts, },
 	{ .parse_prop = parse_regulators, },
 	{ .parse_prop = parse_gpio, },
 	{ .parse_prop = parse_gpios, },
-- 
2.29.2.684.gfbc64c5ab5-goog