[PATCH] platform/x86: serial-multi-instantiate: allow single GpioInt IRQ for INT3515

["Michał Kopeć" <michal@nozomi.space>]

On some devices, such as the Lenovo ThinkPad T14 Gen1 (AMD), there is 
only one
GpioInt resource defined for all i2c device instances. Handle this case
appropriately by autodetecting the irq type and allowing fallback to 
the first
IRQ index for the second, third and fourth tps6598x instances.

Additionally, to use the `platform_get_irq_optional` function to 
silence errors
that may not be relevant if the IRQ is optional. In cases where the IRQ 
is not
optional, `dev_err_probe` is still triggered, so other devices will not 
be
affected by this change.

Signed-off-by: Michał Kopeć <michal@nozomi.space>
---
 .../platform/x86/serial-multi-instantiate.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/serial-multi-instantiate.c 
b/drivers/platform/x86/serial-multi-instantiate.c
index 8158e3cf5d6d..1c4cc44d5a88 100644
--- a/drivers/platform/x86/serial-multi-instantiate.c
+++ b/drivers/platform/x86/serial-multi-instantiate.c
@@ -23,6 +23,8 @@
 #define IRQ_RESOURCE_APIC 2
 #define IRQ_RESOURCE_AUTO 3

+#define IRQ_OPTIONAL BIT(2)
+
 enum smi_bus_type {
  SMI_I2C,
  SMI_SPI,
@@ -59,7 +61,7 @@ static int smi_get_irq(struct platform_device *pdev, 
struct acpi_device *adev,
    dev_dbg(&pdev->dev, "Using gpio irq\n");
    break;
   }
- ret = platform_get_irq(pdev, inst->irq_idx);
+ ret = platform_get_irq_optional(pdev, inst->irq_idx);
   if (ret > 0) {
    dev_dbg(&pdev->dev, "Using platform irq\n");
    break;
@@ -69,12 +71,12 @@ static int smi_get_irq(struct platform_device 
*pdev, struct acpi_device *adev,
   ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx);
   break;
  case IRQ_RESOURCE_APIC:
- ret = platform_get_irq(pdev, inst->irq_idx);
+ ret = platform_get_irq_optional(pdev, inst->irq_idx);
   break;
  default:
   return 0;
  }
- if (ret < 0)
+ if (ret < 0 && !inst->flags & IRQ_OPTIONAL)
   return dev_err_probe(&pdev->dev, ret, "Error requesting irq at index 
%d\n",
          inst->irq_idx);

@@ -210,6 +212,8 @@ static int smi_i2c_probe(struct platform_device 
*pdev, struct smi *smi,
   board_info.dev_name = name;

   ret = smi_get_irq(pdev, adev, &inst_array[i]);
+ if (ret < 0 && inst_array[i].flags & IRQ_OPTIONAL)
+ ret = smi_get_irq(pdev, adev, &inst_array[0]);
   if (ret < 0)
    goto error;
   board_info.irq = ret;
@@ -309,10 +313,11 @@ static const struct smi_node bsg2150_data = {

 static const struct smi_node int3515_data = {
  .instances = {
- { "tps6598x", IRQ_RESOURCE_APIC, 0 },
- { "tps6598x", IRQ_RESOURCE_APIC, 1 },
- { "tps6598x", IRQ_RESOURCE_APIC, 2 },
- { "tps6598x", IRQ_RESOURCE_APIC, 3 },
+ { "tps6598x", IRQ_RESOURCE_AUTO, 0 },
+ /* On some platforms only one shared GpioInt is defined */
+ { "tps6598x", IRQ_RESOURCE_AUTO | IRQ_OPTIONAL, 1 },
+ { "tps6598x", IRQ_RESOURCE_AUTO | IRQ_OPTIONAL, 2 },
+ { "tps6598x", IRQ_RESOURCE_AUTO | IRQ_OPTIONAL, 3 },
   {}
  },
  .bus_type = SMI_I2C,
-- 
2.43.0