irqchip/renesas-rzv2h: Update macros ICU_TSSR_TSSEL_{MASK,PREP}

On RZ/G3E, TSSEL register field is 8 bits wide compared to 7 on RZ/V2H.
Also bits 8..14 is reserved on RZ/G3E and any writes on these reserved
bits is ignored.

Use bitmask GENMASK(field_width - 2, 0) on both SoCs for extracting TSSEL
and then update the macros ICU_TSSR_TSSEL_PREP and ICU_TSSR_TSSEL_MASK for
supporting both SoCs.

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/20250224131253.134199-12-biju.das.jz@bp.renesas.com

Author: bijudas

drivers/irqchip/irq-renesas-rzv2h.c

@@ -64,8 +64,13 @@
 #define ICU_TINT_LEVEL_HIGH			2
 #define ICU_TINT_LEVEL_LOW			3
 
-#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_TSSEL_PREP(tssel, n, field_width)	((tssel) << ((n) * (field_width)))
+#define ICU_TSSR_TSSEL_MASK(n, field_width)	\
+({\
+		typeof(field_width) (_field_width) = (field_width); \
+		ICU_TSSR_TSSEL_PREP((GENMASK(((_field_width) - 2), 0)), (n), _field_width); \
+})
+
 #define ICU_TSSR_TIEN(n, field_width)	\
 ({\
 		typeof(field_width) (_field_width) = (field_width); \
@@ -326,8 +331,8 @@ static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 	guard(raw_spinlock)(&priv->lock);
 
 	tssr = readl_relaxed(priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));
-	tssr &= ~(ICU_TSSR_TSSEL_MASK(tssel_n) | tien);
-	tssr |= ICU_TSSR_TSSEL_PREP(tint, tssel_n);
+	tssr &= ~(ICU_TSSR_TSSEL_MASK(tssel_n, priv->info->field_width) | tien);
+	tssr |= ICU_TSSR_TSSEL_PREP(tint, tssel_n, priv->info->field_width);
 
 	writel_relaxed(tssr, priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));