2014-03-20 3:53 GMT-07:00 Zhangfei Gao <zhangfei.gao@xxxxxxxxx>: > Dear Florian > > On Wed, Mar 19, 2014 at 1:28 AM, Florian Fainelli <f.fainelli@xxxxxxxxx> wrote: >> 2014-03-18 1:40 GMT-07:00 Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>: > >>> +static int hip04_mdio_reset(struct mii_bus *bus) >>> +{ >>> + int temp, err, i; >>> + >>> + for (i = 0; i < 2; i++) { >>> + hip04_mdio_write(bus, i, 22, 0); >>> + temp = hip04_mdio_read(bus, i, MII_BMCR); >>> + temp |= BMCR_RESET; >>> + err = hip04_mdio_write(bus, i, MII_BMCR, temp); >>> + if (err < 0) >>> + return err; >>> + } >>> + >>> + mdelay(500); >> >> This does not look correct, you should iterate over all possible PHYs: >> PHY_MAX_ADDR instead of hardcoding the loop to 2. > > OK, got it. > Use 2 is since only have 2 phy in the board, will use PHY_MAX_ADDR instead. >> >> I think we might want to remove the mdio bus reset callback in general >> as the PHY library should already take care of software resetting the >> PHY to put it in a sane state, as well as waiting for the appropriate >> delay before using, unlike here, where you do not poll for BMCR_RESET >> to be cleared by the PHY. >> > Do you mean will move BMCR_RESET to common code, that's would be great. > The mdio_reset is added here to get phy_id, otherwise the phy_id can > not be read as well as detection. Oh I see, thanks for mentioning that, this is not properly covered here today as we need to get the PHY id before we assign it a phy_device structure, let me cook a patch for this. -- Florian -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html