can: rcar_canfd: Add shared_global_irqs to struct rcar_canfd_hw_info

RZ/G2L has separate IRQ lines for receive FIFO and global error interrupt
whereas R-Car has shared IRQ line.

Add shared_global_irqs to struct rcar_canfd_hw_info to select the driver to
choose between shared and separate irq registration for global
interrupts.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/all/20221027082158.95895-4-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/rcar/rcar_canfd.c

@@ -525,6 +525,8 @@ struct rcar_canfd_global;
 struct rcar_canfd_hw_info {
 	enum rcanfd_chip_id chip_id;
 	u8 max_channels;
+	/* hardware features */
+	unsigned shared_global_irqs:1;	/* Has shared global irqs */
 };
 
 /* Channel priv data */
@@ -597,6 +599,7 @@ static const struct can_bittiming_const rcar_canfd_bittiming_const = {
 static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
 	.chip_id = RENESAS_RCAR_GEN3,
 	.max_channels = 2,
+	.shared_global_irqs = 1,
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
@@ -607,6 +610,7 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = {
 static const struct rcar_canfd_hw_info r8a779a0_hw_info = {
 	.chip_id = RENESAS_R8A779A0,
 	.max_channels = 8,
+	.shared_global_irqs = 1,
 };
 
 /* Helper functions */
@@ -1863,7 +1867,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 		of_node_put(of_child);
 	}
 
-	if (info->chip_id != RENESAS_RZG2L) {
+	if (info->shared_global_irqs) {
 		ch_irq = platform_get_irq_byname_optional(pdev, "ch_int");
 		if (ch_irq < 0) {
 			/* For backward compatibility get irq by index */
@@ -1946,7 +1950,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	gpriv->base = addr;
 
 	/* Request IRQ that's common for both channels */
-	if (info->chip_id != RENESAS_RZG2L) {
+	if (info->shared_global_irqs) {
 		err = devm_request_irq(&pdev->dev, ch_irq,
 				       rcar_canfd_channel_interrupt, 0,
 				       "canfd.ch_int", gpriv);