[tip: irq/core] irqdomain: Allow software nodes for IRQ domain creation

[tip-bot2 for Andy Shevchenko]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     9ed78b05f998050784ae863bd5ba4aea2e2141ed
Gitweb:        https://git.kernel.org/tip/9ed78b05f998050784ae863bd5ba4aea2e2141ed
Author:        Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
AuthorDate:    Wed, 20 May 2020 19:49:27 +03:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Thu, 21 May 2020 10:53:17 +01:00

irqdomain: Allow software nodes for IRQ domain creation

In some cases we need to have an IRQ domain created out of software node.

One of such cases is DesignWare GPIO driver when it's instantiated from
half-baked ACPI table (alas, we can't fix it for devices which are few years
on market) and thus using software nodes to quirk this. But the driver
is using IRQ domains based on per GPIO port firmware nodes, which are in
the above case software ones. This brings a warning message to be printed

  [   73.957183] irq: Invalid fwnode type for irqdomain

and creates an anonymous IRQ domain without a debugfs entry.

Allowing software nodes to be valid for IRQ domains rids us of the warning
and debugs gets correctly populated.

  % ls -1 /sys/kernel/debug/irq/domains/
  ...
  intel-quark-dw-apb-gpio:portA

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
[maz: refactored commit message]
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200520164927.39090-3-andriy.shevchenko@xxxxxxxxxxxxxxx
---
 kernel/irq/irqdomain.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 5d14d91..a4c2c91 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -161,7 +161,8 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
 			domain->name = fwid->name;
 			break;
 		}
-	} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode)) {
+	} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
+		   is_software_node(fwnode)) {
 		char *name;
 
 		/*