[PATCH] i2c: xiic: add ACPI support

[Abdurrahman Hussain]

> On Jan 15, 2026, at 5:02 AM, Wolfram Sang <wsa+renesas at sang-engineering.com> wrote:
> 
> On Thu, Jan 15, 2026 at 12:28:46AM +0000, Abdurrahman Hussain wrote:
>> Use generic device property accessors.
>> Make the clock optional assuming it's managed by firmware.
>> 
>> Signed-off-by: Abdurrahman Hussain <abdurrahman at nexthop.ai>
> 
> On which hardware has this been tested?
> 

This was tested on nexthop.ai data-center NH-4010 switch with Xilinx based FPGA.

The following ACPI ASL fragment was used to describe the device:

            Device (I2C2) {
                Name (_HID, "PRP0001")
                Name (_CRS, ResourceTemplate () {
                    Memory32Fixed (ReadWrite, 0x80a40400, 0x00000200)
                    GpioInt (Level, ActiveHigh, Exclusive, PullNone, 0,
                        "\\_SB.PCI0.GPP5.FPGA") { 10 }
                })
                Name (_DSD, Package () {
                    ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
                    Package () {
                       Package () { "compatible", "xlnx,axi-iic-2.1" },
                       Package () { "single-master", 1 },
                    }
                })
            }