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

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Date:   Mon, 6 May 2019 21:33:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ruslan Babayev <ruslan@...ayev.com>
Cc:     linux@...linux.org.uk, f.fainelli@...il.com, hkallweit1@...il.com,
        mika.westerberg@...ux.intel.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

> Hi Andrew,
> 
> I had the GPIOs and the "maximum-power" property in my ACPI snippet initially,
> but then decided to take it out thinking it was not relevant for the
> current patch. I can add the missing pieces back in V2.
> This is what it would like:
> 
> Device (SFP0)
> {
>     Name (_HID, "PRP0001")
>     Name (_CRS, ResourceTemplate()
>     {
>         GpioIo(Exclusive, PullDefault, 0, 0, IoRestrictionNone,
>                "\\_SB.PCI0.RP01.GPIO", 0, ResourceConsumer)
>             { 0, 1, 2, 3, 4 }
>     })
>     Name (_DSD, Package ()
>     {
>         ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
>         Package () {
>             Package () { "compatible", "sff,sfp" },
>             Package () { "i2c-bus", \_SB.PCI0.RP01.I2C.MUX.CH0 },
>             Package () { "maximum-power-milliwatt", 1000 },
>             Package () { "tx-disable-gpios", Package () { ^SFP0, 0, 0, 1} },
>             Package () { "reset-gpio",       Package () { ^SFP0, 0, 1, 1} },
>             Package () { "mod-def0-gpios",   Package () { ^SFP0, 0, 2, 1} },
>             Package () { "tx-fault-gpios",   Package () { ^SFP0, 0, 3, 0} },
>             Package () { "los-gpios",        Package () { ^SFP0, 0, 4, 1} },
>         },
>     })
> }

Hi Ruslan

I know approximately 0 about ACPI. But that at least lists all the
properties we expect. Thanks.

> > Before accepting this patch, i would like to know more about the
> > complete solution.
> 
> I haven't gotten that far yet, but for the Phylink I was thinking something along the
> lines of:
> 
> Device (PHY0)
> {
>     Name (_HID, "PRP0001")
>     Name (_DSD, Package ()
>     {
>         ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
>         Package () {
>             Package () { "compatible", "ethernet-phy-ieee802.3-c45" },
>             Package () { "sfp", \_SB.PCI0.RP01.SFP0 },
>         },
>     })
> }

You probably also need managed = "in-band-status" and
phy-mode = "sgmii";

armada-388-clearfog.dtsi is probably the best reference, much of the
development work for Phylink and SFPs was done on that board.

> I don't have a complete solution working yet. With these patches
> I was hoping to get some early feedback.

Please post your patches as "RFC" in the subject line, if you are
wanting early feedback.

Thanks
	Andrew