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Fri, 1 Aug 2025 05:53:20 +0000 Date: Fri, 1 Aug 2025 07:53:16 +0200 From: Alexander Wilhelm To: Vladimir Oltean Cc: Andrew Lunn , Heiner Kallweit , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Russell King , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Aquantia PHY in OCSGMII mode? 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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: PAVP192MB2064.EURP192.PROD.OUTLOOK.COM X-Proofpoint-GUID: FMCLI-L6bAUlE8GvFzydK-Wfow5d7ZUX X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODAxMDAzOCBTYWx0ZWRfX1KwVpnMN6ano RPkdqWhrVn0vWOSvkMOwnuUKXQxjc0kF0Eg+9T+jP3t2jq9QjMyk0cVIkuFt3IB3Z98aHfclPE2 bK8czu2UDeO/AEgDJHMbkjRYEwKDs2t6s6QD1IphQs8BQ8fDreNB8rdAcrPUoy3hhqgGq3LPOyP rEUO5yuqUMaeRlh2tluZhAl0piM958bjxlSr2sWcwpMa8h9NkKR6GBkDmcBAAHycBTkm10Pg5yI 6R9cwmvpC09lOTjV72ilZ9CSmecvNXIkxbpmfGuxZtLJCRNuV7liLii4QbAAHeLRC4rg1VQN9Lj 8E9Dz8LeqE6xA0lCghybSsOHQU3Kq8RXljY8EgwbGLSMqoMVM6YJ1S+FpjhNQA= X-Authority-Analysis: v=2.4 cv=IaeHWXqa c=1 sm=1 tr=0 ts=688c5652 cx=c_pps a=gp7YNd5uNe1aOejwC4tjbw==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=8gLI3H-aZtYA:10 a=nG1opYKqXYC8NxJh6-UA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: FMCLI-L6bAUlE8GvFzydK-Wfow5d7ZUX Am Thu, Jul 31, 2025 at 08:16:42PM +0300 schrieb Vladimir Oltean: > Hi Alexander, > > On Thu, Jul 31, 2025 at 04:59:09PM +0200, Alexander Wilhelm wrote: > > Hello devs, > > > > I'm fairly new to Ethernet PHY drivers and would appreciate your help. I'm > > working with the Aquantia AQR115 PHY. The existing driver already supports the > > AQR115C, so I reused that code for the AQR115, assuming minimal differences. My > > goal is to enable 2.5G link speed. The PHY supports OCSGMII mode, which seems to > > be non-standard. > > > > * Is it possible to use this mode with the current driver? > > * If yes, what would be the correct DTS entry? > > * If not, I’d be willing to implement support. Could you suggest a good starting point? > > > > Any hints or guidance would be greatly appreciated. > > > > > > Best regards > > Alexander Wilhelm > > > > In addition to what Andrew and Russell said: > > The Aquantia PHY driver is a bit unlike other PHY drivers, in that it > prefers not to change the hardware configuration, and work with the > provisioning of the firmware. > > Do you know that the PHY firmware was built for OCSGMII, or do you just > intend to use OCSGMII knowing that the hardware capability is there? > Because the driver reads the VEND1_GLOBAL_CFG registers in > aqr107_fill_interface_modes(). These registers tell Linux what host > interface mode to use for each negotiated link speed on the media side. > > If you haven't already, > > [ and I guess you haven't, because you can find there this translation > which clearly shows that OCSGMII corresponds to what Linux treats as > 2500base-x: > > case VEND1_GLOBAL_CFG_SERDES_MODE_OCSGMII: > interface = PHY_INTERFACE_MODE_2500BASEX; > break; > > ] > > then you can instrument this function and see what host interface mode > it detects as configured for VEND1_GLOBAL_CFG_2_5G. Thank you, Vladimir. I already saw the function in source code, but wasn't realy sure how DTS need to be configured. Now I see see that 2500BASEX should be used. I'll check how PHY registers are configured and will look further to what the MAC driver is doing. Best regards Alexander Wilhelm