netdev - Re: [RFC PATCH 0/3] acpi: Add acpi mdio support code

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Message-ID: <f86b43f0-bb72-e445-7bc0-254f07acda17@kernel.org>
Date:   Thu, 8 Nov 2018 18:37:25 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Wang Dongsheng <dongsheng.wang@...-semitech.com>
Cc:     yu.zheng@...-semitech.com, f.fainelli@...il.com, rjw@...ysocki.net,
        linux-acpi@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 0/3] acpi: Add acpi mdio support code

On 11/8/18 5:23 PM, Andrew Lunn wrote:
> I don't know much about ACPI. I do know DT. MDIO busses can have
> multiple PHYs on them. Is the following valid to list two PHYs?
> 
>       Device (MDIO) {
>           Name (_DSD, Package () {
>               ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
>               Package () { Package () { "ethernet-phy@0", PHY0 }, }
>           })
>           Name (PHY0, Package() {
>               ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
>               Package () { Package () { "reg", 0x0 }, }
>           })
>           Name (_DSD, Package () {
>               ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
>               Package () { Package () { "ethernet-phy@10", PHY1 }, }
>           })
>           Name (PHY1, Package() {
>               ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
>               Package () { Package () { "reg", 0x10 }, }
>           })
>       }

You can't have the same DSD twice.  It would need to look like this:

          Name (PHY1, Package() {
              ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
              Package () { Package () { "reg", 0, 0x10 }, }
          })