irqchip/versatile-fpga: Switch to dynamic chip name output

Move the name output to the relevant callback, which allows us
some nice cleanups (mostly owing to the fact that the driver is
now DT only.

We also drop a random include directive from the ftintc010 driver.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220209162607.1118325-8-maz@kernel.org

Author: Marc Zyngier

drivers/irqchip/irq-ftintc010.c

@@ -11,7 +11,6 @@
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/irqchip.h>
-#include <linux/irqchip/versatile-fpga.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of.h>

drivers/irqchip/irq-versatile-fpga.c

@@ -7,12 +7,12 @@
 #include <linux/io.h>
 #include <linux/irqchip.h>
 #include <linux/irqchip/chained_irq.h>
-#include <linux/irqchip/versatile-fpga.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
+#include <linux/seq_file.h>
 
 #include <asm/exception.h>
 #include <asm/mach/irq.h>
@@ -34,14 +34,12 @@
 /**
  * struct fpga_irq_data - irq data container for the FPGA IRQ controller
  * @base: memory offset in virtual memory
- * @chip: chip container for this instance
  * @domain: IRQ domain for this instance
  * @valid: mask for valid IRQs on this controller
  * @used_irqs: number of active IRQs on this controller
  */
 struct fpga_irq_data {
 	void __iomem *base;
-	struct irq_chip chip;
 	u32 valid;
 	struct irq_domain *domain;
 	u8 used_irqs;
@@ -67,6 +65,20 @@ static void fpga_irq_unmask(struct irq_data *d)
 	writel(mask, f->base + IRQ_ENABLE_SET);
 }
 
+static void fpga_irq_print_chip(struct irq_data *d, struct seq_file *p)
+{
+	struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+
+	seq_printf(p, irq_domain_get_of_node(f->domain)->name);
+}
+
+static const struct irq_chip fpga_chip = {
+	.irq_ack	= fpga_irq_mask,
+	.irq_mask	= fpga_irq_mask,
+	.irq_unmask	= fpga_irq_unmask,
+	.irq_print_chip	= fpga_irq_print_chip,
+};
+
 static void fpga_irq_handle(struct irq_desc *desc)
 {
 	struct irq_chip *chip = irq_desc_get_chip(desc);
@@ -116,7 +128,7 @@ static int handle_one_fpga(struct fpga_irq_data *f, struct pt_regs *regs)
  * Keep iterating over all registered FPGA IRQ controllers until there are
  * no pending interrupts.
  */
-asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs)
+static asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs)
 {
 	int i, handled;
 
@@ -135,8 +147,7 @@ static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq,
 	if (!(f->valid & BIT(hwirq)))
 		return -EPERM;
 	irq_set_chip_data(irq, f);
-	irq_set_chip_and_handler(irq, &f->chip,
-				handle_level_irq);
+	irq_set_chip_and_handler(irq, &fpga_chip, handle_level_irq);
 	irq_set_probe(irq);
 	return 0;
 }
@@ -146,8 +157,8 @@ static const struct irq_domain_ops fpga_irqdomain_ops = {
 	.xlate = irq_domain_xlate_onetwocell,
 };
 
-void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
-			  int parent_irq, u32 valid, struct device_node *node)
+static void __init fpga_irq_init(void __iomem *base, int parent_irq,
+				 u32 valid, struct device_node *node)
 {
 	struct fpga_irq_data *f;
 	int i;
@@ -158,31 +169,26 @@ void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
 	}
 	f = &fpga_irq_devices[fpga_irq_id];
 	f->base = base;
-	f->chip.name = name;
-	f->chip.irq_ack = fpga_irq_mask;
-	f->chip.irq_mask = fpga_irq_mask;
-	f->chip.irq_unmask = fpga_irq_unmask;
 	f->valid = valid;
 
 	if (parent_irq != -1) {
 		irq_set_chained_handler_and_data(parent_irq, fpga_irq_handle,
 						 f);
 	}
 
-	/* This will also allocate irq descriptors */
-	f->domain = irq_domain_add_simple(node, fls(valid), irq_start,
+	f->domain = irq_domain_add_linear(node, fls(valid),
 					  &fpga_irqdomain_ops, f);
 
 	/* This will allocate all valid descriptors in the linear case */
 	for (i = 0; i < fls(valid); i++)
 		if (valid & BIT(i)) {
-			if (!irq_start)
-				irq_create_mapping(f->domain, i);
+			/* Is this still required? */
+			irq_create_mapping(f->domain, i);
 			f->used_irqs++;
 		}
 
 	pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs",
-		fpga_irq_id, name, base, f->used_irqs);
+		fpga_irq_id, node->name, base, f->used_irqs);
 	if (parent_irq != -1)
 		pr_cont(", parent IRQ: %d\n", parent_irq);
 	else
@@ -192,8 +198,8 @@ void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
 }
 
 #ifdef CONFIG_OF
-int __init fpga_irq_of_init(struct device_node *node,
-			    struct device_node *parent)
+static int __init fpga_irq_of_init(struct device_node *node,
+				   struct device_node *parent)
 {
 	void __iomem *base;
 	u32 clear_mask;
@@ -222,7 +228,7 @@ int __init fpga_irq_of_init(struct device_node *node,
 		parent_irq = -1;
 	}
 
-	fpga_irq_init(base, node->name, 0, parent_irq, valid_mask, node);
+	fpga_irq_init(base, parent_irq, valid_mask, node);
 
 	/*
 	 * On Versatile AB/PB, some secondary interrupts have a direct