linux-kernel - Re: [PATCH net-next 2/2] net: phy: sfp: enable i2c-bus detection on ACPI based systems

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Date:   Mon, 06 May 2019 11:14:15 -0700
From:   Ruslan Babayev <ruslan@...ayev.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Ruslan Babayev <ruslan@...ayev.com>, linux@...linux.org.uk,
        andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        wsa@...-dreams.de, davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-acpi@...r.kernel.org, xe-linux-external@...co.com
Subject: Re: [PATCH net-next 2/2] net: phy: sfp: enable i2c-bus detection on ACPI based systems


Mika Westerberg writes:

> On Sun, May 05, 2019 at 03:05:23PM -0700, Ruslan Babayev wrote:
>> Lookup I2C adapter using the "i2c-bus" device property on ACPI based
>> systems similar to how it's done with DT.
>> 
>> An example DSD describing an SFP on an ACPI based system:
>> 
>> Device (SFP0)
>> {
>>     Name (_HID, "PRP0001")
>>     Name (_DSD, Package ()
>>     {
>>         ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
>>         Package () {
>>             Package () { "compatible", "sff,sfp" },
>>             Package () { "i2c-bus", \_SB.PCI0.RP01.I2C.MUX.CH0 },
>
> Hmm, ACPI has I2cSerialBusV2() resource for this purpose. Why you are not
> using that?

I am not an ACPI expert, but my understanding is I2cSerialBusV2() is
used for slave connections. I am trying to reference an I2C controller
here.