linux-kernel - [PATCH 3/3] of/irq: Use of_bus_n_addr_cells() to retrieve "#address-cells"

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Message-Id: <20240530-dt-interrupt-map-fix-v1-3-2331d8732f08@kernel.org>
Date: Thu, 30 May 2024 20:03:29 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Saravana Kannan <saravanak@...gle.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] of/irq: Use of_bus_n_addr_cells() to retrieve
 "#address-cells"

of_irq_parse_raw() is open coding what of_bus_n_addr_cells() does, so
replace it with of_bus_n_addr_cells().

Note that the original code would use 2 cells if #address-cells was not
found. That doesn't match the default of 1 for anything but Sparc which
doesn't use this code.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/of/irq.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 462375b293e4..d81ee880a553 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -165,10 +165,10 @@ const __be32 *of_irq_parse_imap_parent(const __be32 *imap, int len, struct of_ph
  */
 int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
 {
-	struct device_node *ipar, *tnode, *old = NULL;
+	struct device_node *ipar, *tnode;
 	__be32 initial_match_array[MAX_PHANDLE_ARGS];
 	const __be32 *match_array = initial_match_array;
-	const __be32 *tmp, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) };
+	const __be32 dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) };
 	u32 intsize = 1, addrsize;
 	int i, rc = -EINVAL;
 
@@ -202,16 +202,7 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
 	/* Look for this #address-cells. We have to implement the old linux
 	 * trick of looking for the parent here as some device-trees rely on it
 	 */
-	old = of_node_get(ipar);
-	do {
-		tmp = of_get_property(old, "#address-cells", NULL);
-		tnode = of_get_parent(old);
-		of_node_put(old);
-		old = tnode;
-	} while (old && tmp == NULL);
-	of_node_put(old);
-	old = NULL;
-	addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp);
+	addrsize = of_bus_n_addr_cells(ipar);
 
 	pr_debug(" -> addrsize=%d\n", addrsize);
 

-- 
2.43.0