netdev - Re: [PATCH net-next v2] net: ngbe: Add ngbe mdio bus driver.

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Message-ID: <Y5W+86YXppK2NocE@lunn.ch>
Date:   Sun, 11 Dec 2022 12:28:51 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "mengyuanlou@...-swift.com" <mengyuanlou@...-swift.com>
Cc:     netdev@...r.kernel.org, jiawenwu@...stnetic.com
Subject: Re: [PATCH net-next v2] net: ngbe: Add ngbe mdio bus driver.

> >> +static void ngbe_up(struct ngbe_adapter *adapter)
> >> +{
> >> +	struct ngbe_hw *hw = &adapter->hw;
> >> +
> >> +	pci_set_master(adapter->pdev);
> >> +	if (hw->gpio_ctrl)
> >> +		/* gpio0 is used to power on control*/
> >> +		wr32(&hw->wxhw, NGBE_GPIO_DR, 0);
> > 
> > Control of what?
> Control for sfp modules power down/up.
> The chip has not i2c interface, so I do not use phylink.

Please give this a better name. Is this connected to the TX_DISABLE
pin of the SFP, or the transmit and receiver power pins?

If you don't have the I2C bus, i'm wondering how you can actually
driver the SFP and the MAC. You have no idea what has been
inserted. Is it actually an SFF, not an SFP? Do you have any of the
GPIOs normally associated with an SFP? TX_DISABLE, LOS, TX_FAULT?

	  Andrew