netdev - Re: [PATCH v3] net: phy: broadcom: add support for BCM5221 phy

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Date: Thu, 5 Oct 2023 11:45:13 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Giulio Benetti <giulio.benetti@...ettiengineering.com>
Cc: linux-kernel@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	Giulio Benetti <giulio.benetti+tekvox@...ettiengineering.com>,
	Jim Reinhart <jimr@...vox.com>, James Autry <jautry@...vox.com>,
	Matthew Maron <matthewm@...vox.com>
Subject: Re: [PATCH v3] net: phy: broadcom: add support for BCM5221 phy

On Thu, Sep 28, 2023 at 08:59:49PM +0200, Giulio Benetti wrote:
> +	/* Read to clear status bits */
>  	reg = phy_read(phydev, MII_BRCM_FET_INTREG);
>  	if (reg < 0)
>  		return reg;
>  
>  	/* Unmask events we are interested in and mask interrupts globally. */
> -	reg = MII_BRCM_FET_IR_DUPLEX_EN |
> -	      MII_BRCM_FET_IR_SPEED_EN |
> -	      MII_BRCM_FET_IR_LINK_EN |
> -	      MII_BRCM_FET_IR_ENABLE |
> -	      MII_BRCM_FET_IR_MASK;

Note this style of formatting, where MII_BRCM_xxx line up with the
first...

> +	if (phydev->phy_id == PHY_ID_BCM5221)
> +		reg = MII_BRCM_FET_IR_ENABLE |
> +		MII_BRCM_FET_IR_MASK;

That should be repeated here.

> +	else
> +		reg = MII_BRCM_FET_IR_DUPLEX_EN |
> +		MII_BRCM_FET_IR_SPEED_EN |
> +		MII_BRCM_FET_IR_LINK_EN |
> +		MII_BRCM_FET_IR_ENABLE |
> +		MII_BRCM_FET_IR_MASK;

and here.

>  
>  	err = phy_write(phydev, MII_BRCM_FET_INTREG, reg);
>  	if (err < 0)
> @@ -726,42 +731,50 @@ static int brcm_fet_config_init(struct phy_device *phydev)
>  
>  	reg = brcmtest | MII_BRCM_FET_BT_SRE;
>  
> -	err = phy_write(phydev, MII_BRCM_FET_BRCMTEST, reg);
> -	if (err < 0)
> -		return err;
> +	phy_lock_mdio_bus(phydev);
>  
> -	/* Set the LED mode */
> -	reg = phy_read(phydev, MII_BRCM_FET_SHDW_AUXMODE4);
> -	if (reg < 0) {
> -		err = reg;
> -		goto done;
> +	err = __phy_write(phydev, MII_BRCM_FET_BRCMTEST, reg);
> +	if (err < 0) {
> +		phy_unlock_mdio_bus(phydev);
> +		return err;
>  	}
>  
> -	reg &= ~MII_BRCM_FET_SHDW_AM4_LED_MASK;
> -	reg |= MII_BRCM_FET_SHDW_AM4_LED_MODE1;
> +	if (phydev->phy_id != PHY_ID_BCM5221) {
> +		/* Set the LED mode */
> +		reg = __phy_read(phydev, MII_BRCM_FET_SHDW_AUXMODE4);
> +		if (reg < 0) {
> +			err = reg;
> +			goto done;
> +		}
>  
> -	err = phy_write(phydev, MII_BRCM_FET_SHDW_AUXMODE4, reg);
> -	if (err < 0)
> -		goto done;
> +		reg &= ~MII_BRCM_FET_SHDW_AM4_LED_MASK;
> +		reg |= MII_BRCM_FET_SHDW_AM4_LED_MODE1;
>  
> -	/* Enable auto MDIX */
> -	err = phy_set_bits(phydev, MII_BRCM_FET_SHDW_MISCCTRL,
> -			   MII_BRCM_FET_SHDW_MC_FAME);
> -	if (err < 0)
> -		goto done;
> +		err = __phy_write(phydev, MII_BRCM_FET_SHDW_AUXMODE4, reg);

I think this can be simplified to:

		err = __phy_modify(phydev, MII_BRCM_FET_SHDW_AUXMODE4,
				   MII_BRCM_FET_SHDW_AM4_LED_MASK,
				   MII_BRCM_FET_SHDW_AM4_LED_MODE1);

-- 
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