Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irqchip updates from Ingo Molnar:
 "Various irqchip driver updates, plus a genirq core update that allows
  the initial spreading of irqs amonst CPUs without having to do it from
  user-space"

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Fix null pointer reference in irq_set_affinity_hint()
  irqchip: gic: Allow interrupt level to be set for PPIs
  irqchip: mips-gic: Handle pending interrupts once in __gic_irq_dispatch()
  irqchip: Conexant CX92755 interrupts controller driver
  irqchip: Devicetree: document Conexant Digicolor irq binding
  irqchip: omap-intc: Remove unused legacy interface for omap2
  irqchip: omap-intc: Fix support for dm814 and dm816
  irqchip: mtk-sysirq: Get irq number from register resource size
  irqchip: renesas-intc-irqpin: r8a7779 IRLM setup support
  genirq: Set initial affinity in irq_set_affinity_hint()

11 files changed, 233 insertions, 68 deletions

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 9516a32..42965d2 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_BRCMSTB_L2_IRQ)		+= irq-brcmstb-l2.o
 obj-$(CONFIG_KEYSTONE_IRQ)		+= irq-keystone.o
 obj-$(CONFIG_MIPS_GIC)			+= irq-mips-gic.o
 obj-$(CONFIG_ARCH_MEDIATEK)		+= irq-mtk-sysirq.o
+obj-$(CONFIG_ARCH_DIGICOLOR)		+= irq-digicolor.o
diff --git a/drivers/irqchip/irq-digicolor.c b/drivers/irqchip/irq-digicolor.c
new file mode 100644
index 0000000..930a2a2
--- /dev/null
+++ b/drivers/irqchip/irq-digicolor.c
@@ -0,0 +1,120 @@
+/*
+ * Conexant Digicolor SoCs IRQ chip driver
+ *
+ * Author: Baruch Siach <baruch@tkos.co.il>
+ *
+ * Copyright (C) 2014 Paradox Innovation Ltd.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include <asm/exception.h>
+
+#include "irqchip.h"
+
+#define UC_IRQ_CONTROL		0x04
+
+#define IC_FLAG_CLEAR_LO	0x00
+#define IC_FLAG_CLEAR_XLO	0x04
+#define IC_INT0ENABLE_LO	0x10
+#define IC_INT0ENABLE_XLO	0x14
+#define IC_INT0STATUS_LO	0x18
+#define IC_INT0STATUS_XLO	0x1c
+
+static struct irq_domain *digicolor_irq_domain;
+
+static void __exception_irq_entry digicolor_handle_irq(struct pt_regs *regs)
+{
+	struct irq_domain_chip_generic *dgc = digicolor_irq_domain->gc;
+	struct irq_chip_generic *gc = dgc->gc[0];
+	u32 status, hwirq;
+
+	do {
+		status = irq_reg_readl(gc, IC_INT0STATUS_LO);
+		if (status) {
+			hwirq = ffs(status) - 1;
+		} else {
+			status = irq_reg_readl(gc, IC_INT0STATUS_XLO);
+			if (status)
+				hwirq = ffs(status) - 1 + 32;
+			else
+				return;
+		}
+
+		handle_domain_irq(digicolor_irq_domain, hwirq, regs);
+	} while (1);
+}
+
+static void digicolor_set_gc(void __iomem *reg_base, unsigned irq_base,
+			     unsigned en_reg, unsigned ack_reg)
+{
+	struct irq_chip_generic *gc;
+
+	gc = irq_get_domain_generic_chip(digicolor_irq_domain, irq_base);
+	gc->reg_base = reg_base;
+	gc->chip_types[0].regs.ack = ack_reg;
+	gc->chip_types[0].regs.mask = en_reg;
+	gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
+	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
+	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
+}
+
+static int __init digicolor_of_init(struct device_node *node,
+				struct device_node *parent)
+{
+	static void __iomem *reg_base;
+	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+	struct regmap *ucregs;
+	int ret;
+
+	reg_base = of_iomap(node, 0);
+	if (!reg_base) {
+		pr_err("%s: unable to map IC registers\n", node->full_name);
+		return -ENXIO;
+	}
+
+	/* disable all interrupts */
+	writel(0, reg_base + IC_INT0ENABLE_LO);
+	writel(0, reg_base + IC_INT0ENABLE_XLO);
+
+	ucregs = syscon_regmap_lookup_by_phandle(node, "syscon");
+	if (IS_ERR(ucregs)) {
+		pr_err("%s: unable to map UC registers\n", node->full_name);
+		return PTR_ERR(ucregs);
+	}
+	/* channel 1, regular IRQs */
+	regmap_write(ucregs, UC_IRQ_CONTROL, 1);
+
+	digicolor_irq_domain =
+		irq_domain_add_linear(node, 64, &irq_generic_chip_ops, NULL);
+	if (!digicolor_irq_domain) {
+		pr_err("%s: unable to create IRQ domain\n", node->full_name);
+		return -ENOMEM;
+	}
+
+	ret = irq_alloc_domain_generic_chips(digicolor_irq_domain, 32, 1,
+					     "digicolor_irq", handle_level_irq,
+					     clr, 0, 0);
+	if (ret) {
+		pr_err("%s: unable to allocate IRQ gc\n", node->full_name);
+		return ret;
+	}
+
+	digicolor_set_gc(reg_base, 0, IC_INT0ENABLE_LO, IC_FLAG_CLEAR_LO);
+	digicolor_set_gc(reg_base, 32, IC_INT0ENABLE_XLO, IC_FLAG_CLEAR_XLO);
+
+	set_handle_irq(digicolor_handle_irq);
+
+	return 0;
+}
+IRQCHIP_DECLARE(conexant_digicolor_ic, "cnxt,cx92755-ic", digicolor_of_init);
diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c
index 61541ff..ad96ebb 100644
--- a/drivers/irqchip/irq-gic-common.c
+++ b/drivers/irqchip/irq-gic-common.c
@@ -21,7 +21,7 @@
 
 #include "irq-gic-common.h"
 
-void gic_configure_irq(unsigned int irq, unsigned int type,
+int gic_configure_irq(unsigned int irq, unsigned int type,
 		       void __iomem *base, void (*sync_access)(void))
 {
 	u32 enablemask = 1 << (irq % 32);
@@ -29,16 +29,17 @@ void gic_configure_irq(unsigned int irq, unsigned int type,
 	u32 confmask = 0x2 << ((irq % 16) * 2);
 	u32 confoff = (irq / 16) * 4;
 	bool enabled = false;
-	u32 val;
+	u32 val, oldval;
+	int ret = 0;
 
 	/*
 	 * Read current configuration register, and insert the config
 	 * for "irq", depending on "type".
 	 */
-	val = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
-	if (type == IRQ_TYPE_LEVEL_HIGH)
+	val = oldval = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
+	if (type & IRQ_TYPE_LEVEL_MASK)
 		val &= ~confmask;
-	else if (type == IRQ_TYPE_EDGE_RISING)
+	else if (type & IRQ_TYPE_EDGE_BOTH)
 		val |= confmask;
 
 	/*
@@ -54,15 +55,20 @@ void gic_configure_irq(unsigned int irq, unsigned int type,
 
 	/*
 	 * Write back the new configuration, and possibly re-enable
-	 * the interrupt.
+	 * the interrupt. If we tried to write a new configuration and failed,
+	 * return an error.
 	 */
 	writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
+	if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val && val != oldval)
+		ret = -EINVAL;
 
 	if (enabled)
 		writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff);
 
 	if (sync_access)
 		sync_access();
+
+	return ret;
 }
 
 void __init gic_dist_config(void __iomem *base, int gic_irqs,
diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h
index b41f024..35a9884 100644
--- a/drivers/irqchip/irq-gic-common.h
+++ b/drivers/irqchip/irq-gic-common.h
@@ -20,7 +20,7 @@
 #include <linux/of.h>
 #include <linux/irqdomain.h>
 
-void gic_configure_irq(unsigned int irq, unsigned int type,
+int gic_configure_irq(unsigned int irq, unsigned int type,
                        void __iomem *base, void (*sync_access)(void));
 void gic_dist_config(void __iomem *base, int gic_irqs,
 		     void (*sync_access)(void));
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 2ab290b..1c6dea2 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -238,7 +238,9 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 	if (irq < 16)
 		return -EINVAL;
 
-	if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
+	/* SPIs have restrictions on the supported types */
+	if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
+			 type != IRQ_TYPE_EDGE_RISING)
 		return -EINVAL;
 
 	if (gic_irq_in_rdist(d)) {
@@ -249,9 +251,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 		rwp_wait = gic_dist_wait_for_rwp;
 	}
 
-	gic_configure_irq(irq, type, base, rwp_wait);
-
-	return 0;
+	return gic_configure_irq(irq, type, base, rwp_wait);
 }
 
 static u64 gic_mpidr_to_affinity(u64 mpidr)
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index d617ee5..4634cf7 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -188,12 +188,15 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 {
 	void __iomem *base = gic_dist_base(d);
 	unsigned int gicirq = gic_irq(d);
+	int ret;
 
 	/* Interrupt configuration for SGIs can't be changed */
 	if (gicirq < 16)
 		return -EINVAL;
 
-	if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
+	/* SPIs have restrictions on the supported types */
+	if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
+			    type != IRQ_TYPE_EDGE_RISING)
 		return -EINVAL;
 
 	raw_spin_lock(&irq_controller_lock);
@@ -201,11 +204,11 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 	if (gic_arch_extn.irq_set_type)
 		gic_arch_extn.irq_set_type(d, type);
 
-	gic_configure_irq(gicirq, type, base, NULL);
+	ret = gic_configure_irq(gicirq, type, base, NULL);
 
 	raw_spin_unlock(&irq_controller_lock);
 
-	return 0;
+	return ret;
 }
 
 static int gic_retrigger(struct irq_data *d)
diff --git a/drivers/irqchip/irq-hip04.c b/drivers/irqchip/irq-hip04.c
index 6bc2deb..7d6ffb5 100644
--- a/drivers/irqchip/irq-hip04.c
+++ b/drivers/irqchip/irq-hip04.c
@@ -120,21 +120,24 @@ static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	void __iomem *base = hip04_dist_base(d);
 	unsigned int irq = hip04_irq(d);
+	int ret;
 
 	/* Interrupt configuration for SGIs can't be changed */
 	if (irq < 16)
 		return -EINVAL;
 
-	if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
+	/* SPIs have restrictions on the supported types */
+	if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
+			 type != IRQ_TYPE_EDGE_RISING)
 		return -EINVAL;
 
 	raw_spin_lock(&irq_controller_lock);
 
-	gic_configure_irq(irq, type, base, NULL);
+	ret = gic_configure_irq(irq, type, base, NULL);
 
 	raw_spin_unlock(&irq_controller_lock);
 
-	return 0;
+	return ret;
 }
 
 #ifdef CONFIG_SMP
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 56b96c6..1daa7ca 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -235,9 +235,9 @@ int gic_get_c0_perfcount_int(void)
 				  GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
 }
 
-static unsigned int gic_get_int(void)
+static void gic_handle_shared_int(void)
 {
-	unsigned int i;
+	unsigned int i, intr, virq;
 	unsigned long *pcpu_mask;
 	unsigned long pending_reg, intrmask_reg;
 	DECLARE_BITMAP(pending, GIC_MAX_INTRS);
@@ -259,7 +259,16 @@ static unsigned int gic_get_int(void)
 	bitmap_and(pending, pending, intrmask, gic_shared_intrs);
 	bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
 
-	return find_first_bit(pending, gic_shared_intrs);
+	intr = find_first_bit(pending, gic_shared_intrs);
+	while (intr != gic_shared_intrs) {
+		virq = irq_linear_revmap(gic_irq_domain,
+					 GIC_SHARED_TO_HWIRQ(intr));
+		do_IRQ(virq);
+
+		/* go to next pending bit */
+		bitmap_clear(pending, intr, 1);
+		intr = find_first_bit(pending, gic_shared_intrs);
+	}
 }
 
 static void gic_mask_irq(struct irq_data *d)
@@ -386,16 +395,26 @@ static struct irq_chip gic_edge_irq_controller = {
 #endif
 };
 
-static unsigned int gic_get_local_int(void)
+static void gic_handle_local_int(void)
 {
 	unsigned long pending, masked;
+	unsigned int intr, virq;
 
 	pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
 	masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
 
 	bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
 
-	return find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
+	intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
+	while (intr != GIC_NUM_LOCAL_INTRS) {
+		virq = irq_linear_revmap(gic_irq_domain,
+					 GIC_LOCAL_TO_HWIRQ(intr));
+		do_IRQ(virq);
+
+		/* go to next pending bit */
+		bitmap_clear(&pending, intr, 1);
+		intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
+	}
 }
 
 static void gic_mask_local_irq(struct irq_data *d)
@@ -454,19 +473,8 @@ static struct irq_chip gic_all_vpes_local_irq_controller = {
 
 static void __gic_irq_dispatch(void)
 {
-	unsigned int intr, virq;
-
-	while ((intr = gic_get_local_int()) != GIC_NUM_LOCAL_INTRS) {
-		virq = irq_linear_revmap(gic_irq_domain,
-					 GIC_LOCAL_TO_HWIRQ(intr));
-		do_IRQ(virq);
-	}
-
-	while ((intr = gic_get_int()) != gic_shared_intrs) {
-		virq = irq_linear_revmap(gic_irq_domain,
-					 GIC_SHARED_TO_HWIRQ(intr));
-		do_IRQ(virq);
-	}
+	gic_handle_local_int();
+	gic_handle_shared_int();
 }
 
 static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c
index 0b0d2c0..eaf0a71 100644
--- a/drivers/irqchip/irq-mtk-sysirq.c
+++ b/drivers/irqchip/irq-mtk-sysirq.c
@@ -23,8 +23,6 @@
 
 #include "irqchip.h"
 
-#define MT6577_SYS_INTPOL_NUM	(224)
-
 struct mtk_sysirq_chip_data {
 	spinlock_t lock;
 	void __iomem *intpol_base;
@@ -124,7 +122,8 @@ static int __init mtk_sysirq_of_init(struct device_node *node,
 {
 	struct irq_domain *domain, *domain_parent;
 	struct mtk_sysirq_chip_data *chip_data;
-	int ret = 0;
+	int ret, size, intpol_num;
+	struct resource res;
 
 	domain_parent = irq_find_host(parent);
 	if (!domain_parent) {
@@ -132,19 +131,24 @@ static int __init mtk_sysirq_of_init(struct device_node *node,
 		return -EINVAL;
 	}
 
+	ret = of_address_to_resource(node, 0, &res);
+	if (ret)
+		return ret;
+
 	chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
 	if (!chip_data)
 		return -ENOMEM;
 
-	chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
-	if (IS_ERR(chip_data->intpol_base)) {
+	size = resource_size(&res);
+	intpol_num = size * 8;
+	chip_data->intpol_base = ioremap(res.start, size);
+	if (!chip_data->intpol_base) {
 		pr_err("mtk_sysirq: unable to map sysirq register\n");
 		ret = PTR_ERR(chip_data->intpol_base);
 		goto out_free;
 	}
 
-	domain = irq_domain_add_hierarchy(domain_parent, 0,
-					  MT6577_SYS_INTPOL_NUM, node,
+	domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
 					  &sysirq_domain_ops, chip_data);
 	if (!domain) {
 		ret = -ENOMEM;
diff --git a/drivers/irqchip/irq-omap-intc.c b/drivers/irqchip/irq-omap-intc.c
index c03f140..a569c6d 100644
--- a/drivers/irqchip/irq-omap-intc.c
+++ b/drivers/irqchip/irq-omap-intc.c
@@ -364,14 +364,6 @@ out:
 		omap_ack_irq(NULL);
 }
 
-void __init omap2_init_irq(void)
-{
-	omap_nr_irqs = 96;
-	omap_nr_pending = 3;
-	omap_init_irq(OMAP24XX_IC_BASE, NULL);
-	set_handle_irq(omap_intc_handle_irq);
-}
-
 void __init omap3_init_irq(void)
 {
 	omap_nr_irqs = 96;
@@ -380,14 +372,6 @@ void __init omap3_init_irq(void)
 	set_handle_irq(omap_intc_handle_irq);
 }
 
-void __init ti81xx_init_irq(void)
-{
-	omap_nr_irqs = 96;
-	omap_nr_pending = 4;
-	omap_init_irq(OMAP34XX_IC_BASE, NULL);
-	set_handle_irq(omap_intc_handle_irq);
-}
-
 static int __init intc_of_init(struct device_node *node,
 			     struct device_node *parent)
 {
@@ -399,7 +383,9 @@ static int __init intc_of_init(struct device_node *node,
 	if (WARN_ON(!node))
 		return -ENODEV;
 
-	if (of_device_is_compatible(node, "ti,am33xx-intc")) {
+	if (of_device_is_compatible(node, "ti,dm814-intc") ||
+	    of_device_is_compatible(node, "ti,dm816-intc") ||
+	    of_device_is_compatible(node, "ti,am33xx-intc")) {
 		omap_nr_irqs = 128;
 		omap_nr_pending = 4;
 	}
@@ -415,4 +401,6 @@ static int __init intc_of_init(struct device_node *node,
 
 IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init);
 IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init);
+IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init);
+IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init);
 IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init);
diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
index 078cac5..9a0767b 100644
--- a/drivers/irqchip/irq-renesas-intc-irqpin.c
+++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
@@ -30,6 +30,7 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_data/irq-renesas-intc-irqpin.h>
 #include <linux/pm_runtime.h>
 
@@ -40,7 +41,9 @@
 #define INTC_IRQPIN_REG_SOURCE 2 /* INTREQnn */
 #define INTC_IRQPIN_REG_MASK 3 /* INTMSKnn */
 #define INTC_IRQPIN_REG_CLEAR 4 /* INTMSKCLRnn */
-#define INTC_IRQPIN_REG_NR 5
+#define INTC_IRQPIN_REG_NR_MANDATORY 5
+#define INTC_IRQPIN_REG_IRLM 5 /* ICR0 with IRLM bit (optional) */
+#define INTC_IRQPIN_REG_NR 6
 
 /* INTC external IRQ PIN hardware register access:
  *
@@ -82,6 +85,10 @@ struct intc_irqpin_priv {
 	u8 shared_irq_mask;
 };
 
+struct intc_irqpin_irlm_config {
+	unsigned int irlm_bit;
+};
+
 static unsigned long intc_irqpin_read32(void __iomem *iomem)
 {
 	return ioread32(iomem);
@@ -345,10 +352,23 @@ static struct irq_domain_ops intc_irqpin_irq_domain_ops = {
 	.xlate  = irq_domain_xlate_twocell,
 };
 
+static const struct intc_irqpin_irlm_config intc_irqpin_irlm_r8a7779 = {
+	.irlm_bit = 23, /* ICR0.IRLM0 */
+};
+
+static const struct of_device_id intc_irqpin_dt_ids[] = {
+	{ .compatible = "renesas,intc-irqpin", },
+	{ .compatible = "renesas,intc-irqpin-r8a7779",
+	  .data = &intc_irqpin_irlm_r8a7779 },
+	{},
+};
+MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
+
 static int intc_irqpin_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct renesas_intc_irqpin_config *pdata = dev->platform_data;
+	const struct of_device_id *of_id;
 	struct intc_irqpin_priv *p;
 	struct intc_irqpin_iomem *i;
 	struct resource *io[INTC_IRQPIN_REG_NR];
@@ -391,10 +411,11 @@ static int intc_irqpin_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
 
-	/* get hold of manadatory IOMEM */
+	/* get hold of register banks */
+	memset(io, 0, sizeof(io));
 	for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
 		io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
-		if (!io[k]) {
+		if (!io[k] && k < INTC_IRQPIN_REG_NR_MANDATORY) {
 			dev_err(dev, "not enough IOMEM resources\n");
 			ret = -EINVAL;
 			goto err0;
@@ -422,6 +443,10 @@ static int intc_irqpin_probe(struct platform_device *pdev)
 	for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
 		i = &p->iomem[k];
 
+		/* handle optional registers */
+		if (!io[k])
+			continue;
+
 		switch (resource_size(io[k])) {
 		case 1:
 			i->width = 8;
@@ -448,6 +473,19 @@ static int intc_irqpin_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* configure "individual IRQ mode" where needed */
+	of_id = of_match_device(intc_irqpin_dt_ids, dev);
+	if (of_id && of_id->data) {
+		const struct intc_irqpin_irlm_config *irlm_config = of_id->data;
+
+		if (io[INTC_IRQPIN_REG_IRLM])
+			intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_IRLM,
+						      irlm_config->irlm_bit,
+						      1, 1);
+		else
+			dev_warn(dev, "unable to select IRLM mode\n");
+	}
+
 	/* mask all interrupts using priority */
 	for (k = 0; k < p->number_of_irqs; k++)
 		intc_irqpin_mask_unmask_prio(p, k, 1);
@@ -550,12 +588,6 @@ static int intc_irqpin_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id intc_irqpin_dt_ids[] = {
-	{ .compatible = "renesas,intc-irqpin", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
-
 static struct platform_driver intc_irqpin_device_driver = {
 	.probe		= intc_irqpin_probe,
 	.remove		= intc_irqpin_remove,