platform/x86: serial-multi-instantiate: Add IRQ_RESOURCE_OPT for IRQ missing projects

The tas2781-hda supports multi-projects. In some projects, GpioInt() was
dropped due to no IRQ connection. See the example code below:

Device (SPKR)
{
    Name (_ADR, One)
    Name (_HID, "TXNW2781")
    Method (_CRS, 0, NotSerialized)
    {
        Name (RBUF, ResourceTemplate ()
        {
            I2cSerialBusV2 (0x0038, ...)
            I2cSerialBusV2 (0x0039, ...)
            // GpioInt (Edge, ...) { 0x0000 }
            //"GpioInt (...) {}" was commented out due to no IRQ connection.
        })
        Return (RBUF)
    }
}

But in smi_i2c_probe(), smi_spi_probe() (serial-multi-instantiate.c), if
looking for IRQ by smi_get_irq() fails, it will return an error, will not add
new device, and cause smi_probe() to fail:

[    2.356546] Serial bus multi instantiate pseudo device driver TXNW2781:00:
error -ENXIO: IRQ index 0 not found
[    2.356561] Serial bus multi instantiate pseudo device driver TXNW2781:00:
error -ENXIO: Error requesting irq at index 0

So, we need to add an exception case for these situations. BTW, this patch
will take effect on both I2C and SPI devices.

Signed-off-by: Baojun Xu <baojun.xu@ti.com>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20251126141434.11110-1-baojun.xu@ti.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: jimxbj-dot

drivers/platform/x86/serial-multi-instantiate.c

@@ -22,6 +22,7 @@
 #define IRQ_RESOURCE_GPIO	1
 #define IRQ_RESOURCE_APIC	2
 #define IRQ_RESOURCE_AUTO   3
+#define IRQ_RESOURCE_OPT	BIT(2)
 
 enum smi_bus_type {
 	SMI_I2C,
@@ -64,6 +65,10 @@ static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev,
 			dev_dbg(&pdev->dev, "Using platform irq\n");
 			break;
 		}
+		if (inst->flags & IRQ_RESOURCE_OPT) {
+			dev_dbg(&pdev->dev, "No irq\n");
+			return 0;
+		}
 		break;
 	case IRQ_RESOURCE_GPIO:
 		ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx);
@@ -386,10 +391,10 @@ static const struct smi_node cs35l57_hda = {
 
 static const struct smi_node tas2781_hda = {
 	.instances = {
-		{ "tas2781-hda", IRQ_RESOURCE_AUTO, 0 },
-		{ "tas2781-hda", IRQ_RESOURCE_AUTO, 0 },
-		{ "tas2781-hda", IRQ_RESOURCE_AUTO, 0 },
-		{ "tas2781-hda", IRQ_RESOURCE_AUTO, 0 },
+		{ "tas2781-hda", IRQ_RESOURCE_AUTO | IRQ_RESOURCE_OPT, 0 },
+		{ "tas2781-hda", IRQ_RESOURCE_AUTO | IRQ_RESOURCE_OPT, 0 },
+		{ "tas2781-hda", IRQ_RESOURCE_AUTO | IRQ_RESOURCE_OPT, 0 },
+		{ "tas2781-hda", IRQ_RESOURCE_AUTO | IRQ_RESOURCE_OPT, 0 },
 		{}
 	},
 	.bus_type = SMI_AUTO_DETECT,