linux-kernel - Re: [PATCH v5] platform/x86: serial-multi-instantiate: Add IRQ_RESOURCE

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Message-ID: <ce56da25-e8cb-4438-b75b-1dd32df10d89@kernel.org>
Date: Wed, 26 Nov 2025 18:19:47 +0100
From: Hans de Goede <hansg@...nel.org>
To: Baojun Xu <baojun.xu@...com>, tiwai@...e.de
Cc: ilpo.jarvinen@...ux.intel.com, broonie@...nel.org,
 andriy.shevchenko@...ux.intel.com, alsa-devel@...a-project.org,
 shenghao-ding@...com, 13916275206@....com,
 platform-driver-x86@...r.kernel.org, linux-sound@...r.kernel.org,
 linux-kernel@...r.kernel.org, letitia.tsai@...com
Subject: Re: [PATCH v5] platform/x86: serial-multi-instantiate: Add
 IRQ_RESOURCE_OPT for IRQ missing projects

Hi,

On 26-Nov-25 3:14 PM, Baojun Xu wrote:
> 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@...com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <johannes.goede@....qualcomm.com>

Regards,

Hans




> ---
> v5:
>  - Change the description for this patch, remove cover letter.
> v4:
>  - Change the description for this patch.
> v3:
>  - Add IRQ_RESOURCE_OPT for IRQ missing cases.
> v2:
>  - Remove error ignore, change to AUTO compatible with NONE.
> ---
>  drivers/platform/x86/serial-multi-instantiate.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/platform/x86/serial-multi-instantiate.c b/drivers/platform/x86/serial-multi-instantiate.c
> index db030b0f176a..1a369334f9cb 100644
> --- a/drivers/platform/x86/serial-multi-instantiate.c
> +++ b/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,