irqchip/renesas-rzv2h: Add field_width to struct rzv2h_hw_info

On RZ/G3E the field width for TSSR register for a TINT is 16 compared to 8
on the RZ/V2H.

Add field_width to struct rzv2h_hw_info and replace the macros ICU_TSSR_K
and ICU_TSSR_TSSEL_N by a runtime evaluation:

    (32 / field_width) provides the number of tints in the TSSR register.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/all/20250224131253.134199-10-biju.das.jz@bp.renesas.com

Author: bijudas

drivers/irqchip/irq-renesas-rzv2h.c

@@ -64,8 +64,6 @@
 #define ICU_TINT_LEVEL_HIGH			2
 #define ICU_TINT_LEVEL_LOW			3
 
-#define ICU_TSSR_K(tint_nr)			((tint_nr) / 4)
-#define ICU_TSSR_TSSEL_N(tint_nr)		((tint_nr) % 4)
 #define ICU_TSSR_TSSEL_PREP(tssel, n)		((tssel) << ((n) * 8))
 #define ICU_TSSR_TSSEL_MASK(n)			ICU_TSSR_TSSEL_PREP(0x7F, n)
 #define ICU_TSSR_TIEN(n)			(BIT(7) << ((n) * 8))
@@ -84,10 +82,12 @@
  * struct rzv2h_hw_info - Interrupt Control Unit controller hardware info structure.
  * @t_offs:		TINT offset
  * @max_tssel:		TSSEL max value
+ * @field_width:	TSSR field width
  */
 struct rzv2h_hw_info {
 	u16		t_offs;
 	u8		max_tssel;
+	u8		field_width;
 };
 
 /**
@@ -140,13 +140,15 @@ static void rzv2h_tint_irq_endisable(struct irq_data *d, bool enable)
 	struct rzv2h_icu_priv *priv = irq_data_to_priv(d);
 	unsigned int hw_irq = irqd_to_hwirq(d);
 	u32 tint_nr, tssel_n, k, tssr;
+	u8 nr_tint;
 
 	if (hw_irq < ICU_TINT_START)
 		return;
 
 	tint_nr = hw_irq - ICU_TINT_START;
-	k = ICU_TSSR_K(tint_nr);
-	tssel_n = ICU_TSSR_TSSEL_N(tint_nr);
+	nr_tint = 32 / priv->info->field_width;
+	k = tint_nr / nr_tint;
+	tssel_n = tint_nr % nr_tint;
 
 	guard(raw_spinlock)(&priv->lock);
 	tssr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TSSR(k));
@@ -278,6 +280,7 @@ static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 	unsigned int hwirq;
 	u32 tint, sense;
 	int tint_nr;
+	u8 nr_tint;
 
 	switch (type & IRQ_TYPE_SENSE_MASK) {
 	case IRQ_TYPE_LEVEL_LOW:
@@ -308,8 +311,9 @@ static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 	hwirq = irqd_to_hwirq(d);
 	tint_nr = hwirq - ICU_TINT_START;
 
-	tssr_k = ICU_TSSR_K(tint_nr);
-	tssel_n = ICU_TSSR_TSSEL_N(tint_nr);
+	nr_tint = 32 / priv->info->field_width;
+	tssr_k = tint_nr / nr_tint;
+	tssel_n = tint_nr % nr_tint;
 	tien = ICU_TSSR_TIEN(tssel_n);
 
 	titsr_k = ICU_TITSR_K(tint_nr);
@@ -519,6 +523,7 @@ static int rzv2h_icu_init_common(struct device_node *node, struct device_node *p
 static const struct rzv2h_hw_info rzv2h_hw_params = {
 	.t_offs		= 0,
 	.max_tssel	= ICU_RZV2H_TSSEL_MAX_VAL,
+	.field_width	= 8,
 };
 
 static int rzv2h_icu_init(struct device_node *node, struct device_node *parent)