linux-kernel - [RFC PATCH v2 04/21] ACPI: irq: Add support for deferred probe in acpi_register

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Message-Id: <20231025202344.581132-5-sunilvl@ventanamicro.com>
Date:   Thu, 26 Oct 2023 01:53:27 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-serial@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Anup Patel <anup@...infault.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Kumar Patra <atishp@...osinc.com>,
        Haibo Xu <haibo1.xu@...el.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v2 04/21] ACPI: irq: Add support for deferred probe in acpi_register_gsi()

The chip which provides the GSI support may not be initialized at the
time of acpi_register_gsi(). Return -EPROBE_DEFER to support deferred
probing similar to acpi_irq_get().

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/acpi/irq.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c
index 1687483ff319..c06cfc9725cb 100644
--- a/drivers/acpi/irq.c
+++ b/drivers/acpi/irq.c
@@ -51,19 +51,23 @@ EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
  * @polarity: polarity of the GSI to be mapped
  *
  * Returns: a valid linux IRQ number on success
+ *          -EPROBE_DEFER if irqdomain is not available.
  *          -EINVAL on failure
  */
 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
 		      int polarity)
 {
+	struct irq_domain *domain;
 	struct irq_fwspec fwspec;
 	unsigned int irq;
 
 	fwspec.fwnode = acpi_get_gsi_domain_id(gsi);
-	if (WARN_ON(!fwspec.fwnode)) {
-		pr_warn("GSI: No registered irqchip, giving up\n");
-		return -EINVAL;
-	}
+	if (!fwspec.fwnode)
+		return -EPROBE_DEFER;
+
+	domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY);
+	if (!domain)
+		return -EPROBE_DEFER;
 
 	fwspec.param[0] = gsi;
 	fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
-- 
2.39.2