linux-kernel - [PATCH 3/5] irqchip: vt8500: Don't require 8 interrupts from a chained controller

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Message-Id: <20250424-vt8500-intc-updates-v1-3-4ab7397155b3@gmail.com>
Date: Thu, 24 Apr 2025 22:35:44 +0400
From: Alexey Charkov <alchark@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>, 
 Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Alexey Charkov <alchark@...il.com>
Subject: [PATCH 3/5] irqchip: vt8500: Don't require 8 interrupts from a
 chained controller

VT8500 chained controller can route its interrupts to either or all
of its 8 interrupt outputs. Current code actually routes all of them
to the first output, so there is no need to create mappings for all
eight.

Drop redundant checks, and only map as many chained controller
interrupts as are defined in the device tree.

Signed-off-by: Alexey Charkov <alchark@...il.com>
---
 drivers/irqchip/irq-vt8500.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-vt8500.c b/drivers/irqchip/irq-vt8500.c
index 6d46e1a0fda953d76679ad2318674fdf0a977f0b..cf24a88f52d1b90f033d429288c88398439b92d1 100644
--- a/drivers/irqchip/irq-vt8500.c
+++ b/drivers/irqchip/irq-vt8500.c
@@ -220,16 +220,9 @@ static int __init vt8500_irq_init(struct device_node *node,
 
 	active_cnt++;
 
-	/* check if this is a slaved controller */
+	/* check if this is a chained controller */
 	if (of_irq_count(node) != 0) {
-		/* check that we have the correct number of interrupts */
-		if (of_irq_count(node) != 8) {
-			pr_err("%s: Incorrect IRQ map for slaved controller\n",
-					__func__);
-			return -EINVAL;
-		}
-
-		for (i = 0; i < 8; i++) {
+		for (i = 0; i < of_irq_count(node); i++) {
 			irq = irq_of_parse_and_map(node, i);
 			enable_irq(irq);
 		}

-- 
2.49.0