linux-kernel - [PATCH v3 02/11] of/irq: Set FWNODE_FLAG_BEST_EFFORT for the interrupt controller DT nodes

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Message-Id: <20230508142842.854564-3-apatel@ventanamicro.com>
Date:   Mon,  8 May 2023 19:58:33 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Atish Patra <atishp@...shpatra.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, iommu@...ts.linux.dev,
        Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH v3 02/11] of/irq: Set FWNODE_FLAG_BEST_EFFORT for the interrupt controller DT nodes

The RISC-V APLIC interrupt controller driver is a regular platform
driver so we need to ensure that it is probed as soon as possible.
To achieve this, we mark the interrupt controller device nodes with
FWNODE_FLAG_BEST_EFFORT (just like console DT node).

Fixes: 8f486cab263c ("driver core: fw_devlink: Allow firmware to mark devices as best effort")
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 drivers/of/irq.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 174900072c18..94e1d9245cff 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -535,6 +535,16 @@ void __init of_irq_init(const struct of_device_id *matches)
 	INIT_LIST_HEAD(&intc_desc_list);
 	INIT_LIST_HEAD(&intc_parent_list);
 
+	/*
+	 * We need interrupt controller platform drivers to work as soon
+	 * as possible so mark the interrupt controller device nodes with
+	 * FWNODE_FLAG_BEST_EFFORT so that fw_delink knows not to delay
+	 * the probe of the interrupt controller device for suppliers
+	 * without drivers.
+	 */
+	for_each_node_with_property(np, "interrupt-controller")
+		np->fwnode.flags |= FWNODE_FLAG_BEST_EFFORT;
+
 	for_each_matching_node_and_match(np, matches, &match) {
 		if (!of_property_read_bool(np, "interrupt-controller") ||
 				!of_device_is_available(np))
-- 
2.34.1