Messages in this thread | | | Date | Tue, 2 Nov 2021 01:49:42 +0100 | From | Andrew Lunn <> | Subject | Re: [RFC PATCH] net: phy/mdio: enable mmd indirect access through phy_mii_ioctl() |
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> The use of the indirect registers is specific to PHYs, and we already > know that various PHYs don't support indirect access, and some emulate > access to the EEE registers - both of which are handled at the PHY > driver level.
That is actually an interesting point. Should the ioctl call actually use the PHY driver read_mmd and write_mmd? Or should it go direct to the bus? realtek uses MII_MMD_DATA for something to do with suspend, and hence it uses genphy_write_mmd_unsupported(), or it has its own function emulating MMD operations.
So maybe the ioctl handler actually needs to use __phy_read_mmd() if there is a phy at the address, rather than go direct to the bus?
Or maybe we should just say no, you should do this all from userspace, by implementing C45 over C22 in userspace, the ioctl allows that, the kernel does not need to be involved.
Andrew
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