linux-kernel - [PATCH v4 0/1] platform/x86: serial-multi-instantiate: ACPI example code

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Message-ID: <20251126121911.10980-1-baojun.xu@ti.com>
Date: Wed, 26 Nov 2025 20:19:10 +0800
From: Baojun Xu <baojun.xu@...com>
To: <tiwai@...e.de>, <hansg@...nel.org>
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>, <baojun.xu@...com>, <letitia.tsai@...com>
Subject: [PATCH v4 0/1] platform/x86: serial-multi-instantiate: ACPI example code

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

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

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)
    }
}

Baojun Xu (1):
  platform/x86: serial-multi-instantiate: Add IRQ_RESOURCE_OPT for IRQ
    missing projects

 drivers/platform/x86/serial-multi-instantiate.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

-- 
2.25.1