linux-kernel - Re: [PATCH] i2c: xiic: add ACPI support

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Message-Id: <AAB5CE7A-9264-4CE1-8A49-2FD3043B0A80@nexthop.ai>
Date: Thu, 15 Jan 2026 11:04:39 -0800
From: Abdurrahman Hussain <abdurrahman@...thop.ai>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: Michal Simek <michal.simek@....com>,
 Andi Shyti <andi.shyti@...nel.org>,
 linux-arm-kernel@...ts.infradead.org,
 linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: xiic: add ACPI support



> On Jan 15, 2026, at 5:02 AM, Wolfram Sang <wsa+renesas@...g-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@...thop.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 },
                    }
                })
            }