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Date: Sun, 23 Jun 2019 17:09:02 +0200 From: Andrew Lunn <andrew@...n.ch> To: Parshuram Thombare <pthombar@...ence.com> Cc: nicolas.ferre@...rochip.com, davem@...emloft.net, f.fainelli@...il.com, linux@...linux.org.uk, netdev@...r.kernel.org, hkallweit1@...il.com, linux-kernel@...r.kernel.org, rafalc@...ence.com, aniljoy@...ence.com, piotrs@...ence.com Subject: Re: [PATCH v4 4/5] net: macb: add support for high speed interface > +enum { > + HS_MAC_SPEED_100M, > + HS_MAC_SPEED_1000M, > + HS_MAC_SPEED_2500M, > + HS_MAC_SPEED_5000M, > + HS_MAC_SPEED_10000M, > + HS_MAC_SPEED_25000M, > +}; > + > +enum { > + MACB_SERDES_RATE_5_PT_15625Gbps = 5, > + MACB_SERDES_RATE_10_PT_3125Gbps = 10, > +}; What do the units mean here? Why would you clock the SERDES at 15Tbps, or 3Tbps? 3.125Mbps would give you 2.5Gbps when using 8b/10b encoding. > + if (bp->phy_interface == PHY_INTERFACE_MODE_USXGMII) { > + switch (bp->serdes_rate) { > + case MACB_SERDES_RATE_5_PT_15625Gbps: > + rate = 78125000; > + break; > + case MACB_SERDES_RATE_10_PT_3125Gbps: > + rate = 156250000; > + break; > + default: > + return; > + } Xilinx documentation: https://www.xilinx.com/support/documentation/ip_documentation/usxgmii/v1_1/pg251-usxgmii.pdf seems to suggest USXGMII uses a fixed rate of 10.3125Gb/s. So why do you need to change the rate? Andrew
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