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Date:      Fri, 6 Sep 2024 18:03:39 +0000
From:      Mike Belanger <mibelanger@blackberry.com>
To:        "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Subject:   Ethernet device with shared mdio
Message-ID:  <YQXPR01MB4198A8ED40891B0B51B5A4F6BC9E2@YQXPR01MB4198.CANPRD01.PROD.OUTLOOK.COM>
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[-- Attachment #1 --]
The following device tree specifies a shared mdio.
The ffec driver uses miibus.
When there is a shared mdio, one of the device instances will not be able to properly configure the PHY, as it needs to use the other devices resource to read/write the PHY.

&fec1 {
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_fec1>;
                phy-mode = "rgmii-id";
                phy-handle = <&ethphy0>;
                fsl,magic-packet;
                status = "okay";

                mdio {
                                #address-cells = <1>;
                                #size-cells = <0>;

                                ethphy0: ethernet-phy@0 {
                                                compatible = "ethernet-phy-ieee802.3-c22";
                                                reg = <0>;
                                };

                                ethphy1: ethernet-phy@1 {
                                                compatible = "ethernet-phy-ieee802.3-c22";
                                                reg = <1>;
                                };
                };
};

&fec2 {
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_fec2>;
                phy-mode = "rgmii-txid";
                phy-handle = <&ethphy1>;
                phy-supply = <&reg_fec2_supply>;
                nvmem-cells = <&fec_mac1>;
                nvmem-cell-names = "mac-address";
                rx-internal-delay-ps = <2000>;
                fsl,magic-packet;
                status = "okay";
};

Does FreeBSD have any plans for supporting hardware that specifies a shared mdio in the dtb?
Just knowing the general approach being considered would be helpful.

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<p class="MsoNormal"><span style="font-size:11.0pt">The following device tree specifies a shared mdio.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The ffec driver uses miibus.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">When there is a shared mdio, one of the device instances will not be able to properly configure the PHY, as it needs to use the other devices resource to read/write the PHY.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&amp;fec1 {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pinctrl-names = &quot;default&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pinctrl-0 = &lt;&amp;pinctrl_fec1&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; phy-mode = &quot;rgmii-id&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; phy-handle = &lt;&amp;ethphy0&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fsl,magic-packet;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; status = &quot;okay&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mdio {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #address-cells = &lt;1&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #size-cells = &lt;0&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ethphy0: ethernet-phy@0 {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; compatible = &quot;ethernet-phy-ieee802.3-c22&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; reg = &lt;0&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; };<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ethphy1: ethernet-phy@1 {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; compatible = &quot;ethernet-phy-ieee802.3-c22&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; reg = &lt;1&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; };<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; };<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&amp;fec2 {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pinctrl-names = &quot;default&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pinctrl-0 = &lt;&amp;pinctrl_fec2&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; phy-mode = &quot;rgmii-txid&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; phy-handle = &lt;&amp;ethphy1&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; phy-supply = &lt;&amp;reg_fec2_supply&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nvmem-cells = &lt;&amp;fec_mac1&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nvmem-cell-names = &quot;mac-address&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rx-internal-delay-ps = &lt;2000&gt;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; fsl,magic-packet;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; status = &quot;okay&quot;;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Does FreeBSD have any plans for supporting hardware that specifies a shared mdio in the dtb?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Just knowing the general approach being considered would be helpful.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p>&nbsp;</o:p></span></p>
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