[PATCH v2] irqchip: Add IRQCHIP_PLATFORM_DRIVER_BEGIN/END and IRQCHIP_MATCH helper macros

[Saravana Kannan]

Compiling an irqchip driver as a platform driver needs to bunch of
things to be done right:
- Making sure the parent domain is initialized first
- Making sure the device can't be unbound from sysfs
- Disallowing module unload if it's built as a module
- Finding the parent node
- Etc.

Instead of trying to make sure all future irqchip platform drivers get
this right, provide boilerplate macros that take care of all of this.

An example use would look something like this. Where acme_foo_init and
acme_bar_init are similar to what would be passed to IRQCHIP_DECLARE.

IRQCHIP_PLATFORM_DRIVER_BEGIN
IRQCHIP_MATCH(foo, "acme,foo", acme_foo_init)
IRQCHIP_MATCH(bar, "acme,bar", acme_bar_init)
IRQCHIP_PLATFORM_DRIVER_END(acme_irq)

Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
---
 drivers/irqchip/irqchip.c | 22 ++++++++++++++++++++++
 include/linux/irqchip.h   | 23 +++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c
index 2b35e68bea82..236ea793f01c 100644
--- a/drivers/irqchip/irqchip.c
+++ b/drivers/irqchip/irqchip.c
@@ -10,8 +10,10 @@
 
 #include <linux/acpi.h>
 #include <linux/init.h>
+#include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/irqchip.h>
+#include <linux/platform_device.h>
 
 /*
  * This special of_device_id is the sentinel at the end of the
@@ -29,3 +31,23 @@ void __init irqchip_init(void)
 	of_irq_init(__irqchip_of_table);
 	acpi_probe_device_table(irqchip);
 }
+
+int platform_irqchip_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *par_np = of_irq_find_parent(np);
+	of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
+
+	if (!irq_init_cb)
+		return -EINVAL;
+
+	if (par_np == np)
+		par_np = NULL;
+
+	/* If there's a parent irqchip, make sure it has been initialized. */
+	if (par_np && !irq_find_matching_host(np, DOMAIN_BUS_ANY))
+		return -EPROBE_DEFER;
+
+	return irq_init_cb(np, par_np);
+}
+EXPORT_SYMBOL_GPL(platform_irqchip_probe);
diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h
index 950e4b2458f0..6d5eba7cbbb7 100644
--- a/include/linux/irqchip.h
+++ b/include/linux/irqchip.h
@@ -13,6 +13,7 @@
 
 #include <linux/acpi.h>
 #include <linux/of.h>
+#include <linux/platform_device.h>
 
 /*
  * This macro must be used by the different irqchip drivers to declare
@@ -26,6 +27,28 @@
  */
 #define IRQCHIP_DECLARE(name, compat, fn) OF_DECLARE_2(irqchip, name, compat, fn)
 
+extern int platform_irqchip_probe(struct platform_device *pdev);
+
+#define IRQCHIP_PLATFORM_DRIVER_BEGIN \
+static const struct of_device_id __irqchip_match_table[] = {
+
+#define IRQCHIP_MATCH(compat, fn) { .compatible = compat, .data = fn },
+
+#define IRQCHIP_PLATFORM_DRIVER_END(drv_name)		\
+	{},						\
+};							\
+MODULE_DEVICE_TABLE(of, __irqchip_match_table);		\
+static struct platform_driver drv_name##_driver = {	\
+	.probe  = platform_irqchip_probe,		\
+	.driver = {					\
+		.name = #drv_name,			\
+		.owner = THIS_MODULE,			\
+		.of_match_table = __irqchip_match_table,\
+		.suppress_bind_attrs = true,		\
+	},						\
+};							\
+builtin_platform_driver(drv_name##_driver)
+
 /*
  * This macro must be used by the different irqchip drivers to declare
  * the association between their version and their initialization function.
-- 
2.28.0.rc0.105.gf9edc3c819-goog