linux-kernel - [PATCH v3 08/10] regmap: Allow setting IRQ domain name suffix

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Date: Tue, 4 Jun 2024 10:56:01 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Thomas Gleixner <tglx@...utronix.de>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: [PATCH v3 08/10] regmap: Allow setting IRQ domain name suffix

When multiple IRQ domains are created from the same device-tree node they
will get the same name based on the device-tree path. This will cause a
naming collision in debugFS when IRQ domain specific entries are created.

The regmap-IRQ creates per instance IRQ domains. This will lead to a
domain name conflict when a device which provides more than one
interrupt line uses the regmap-IRQ.

Add support for specifying an IRQ domain name suffix when creating a
regmap-IRQ controller.

The regmap-IRQ supports both the legacy IRQ domains and the linear IRQ
domains. New devices are not expected to be using the legacy domains so
support name suffixes only for linear domains and warn if suffix is
tried to be added for a legacy domain.

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
Revision history:
v2 => v3:
 - Drop name suffix support for the legacy domains
---
 drivers/base/regmap/regmap-irq.c | 15 +++++++++++----
 include/linux/regmap.h           |  4 ++++
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 45fd13ef13fc..79247202aa9d 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -856,13 +856,20 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 		}
 	}
 
-	if (irq_base)
+	if (irq_base) {
+		if (chip->domain_suffix)
+			dev_warn(map->dev,
+				"Can't add name suffix for legacy domain\n");
+
 		d->domain = irq_domain_create_legacy(fwnode, chip->num_irqs,
 						     irq_base, 0,
 						     &regmap_domain_ops, d);
-	else
-		d->domain = irq_domain_create_linear(fwnode, chip->num_irqs,
-						     &regmap_domain_ops, d);
+	} else {
+		d->domain = irq_domain_create_linear_named(fwnode,
+						chip->num_irqs, &regmap_domain_ops,
+						d, chip->domain_suffix);
+	}
+
 	if (!d->domain) {
 		dev_err(map->dev, "Failed to create IRQ domain\n");
 		ret = -ENOMEM;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index a6bc2980a98b..b0b6cd3afefa 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1519,6 +1519,9 @@ struct regmap_irq_chip_data;
  * struct regmap_irq_chip - Description of a generic regmap irq_chip.
  *
  * @name:        Descriptive name for IRQ controller.
+ * @domain_suffix: Name suffix to be appended to end of IRQ domain name. Needed
+ *		   when multiple regmap-IRQ controllers are created from same
+ *		   device.
  *
  * @main_status: Base main status register address. For chips which have
  *		 interrupts arranged in separate sub-irq blocks with own IRQ
@@ -1604,6 +1607,7 @@ struct regmap_irq_chip_data;
  */
 struct regmap_irq_chip {
 	const char *name;
+	const char *domain_suffix;
 
 	unsigned int main_status;
 	unsigned int num_main_status_bits;
-- 
2.45.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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