linux-kernel - Re: [PATCH net-next 3/3] et: mdio: mscc-miim: add lan966x internal phy reset support

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Message-ID: <Yi4DMGnpiOswNiXp@lunn.ch>
Date:   Sun, 13 Mar 2022 15:44:00 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] et: mdio: mscc-miim: add lan966x internal
 phy reset support

>  /* When high resolution timers aren't built-in: we can't use usleep_range() as
> @@ -157,27 +166,29 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
>  static int mscc_miim_reset(struct mii_bus *bus)
>  {
>  	struct mscc_miim_dev *miim = bus->priv;
> -	int offset = miim->phy_reset_offset;
> -	int mask = PHY_CFG_PHY_ENA | PHY_CFG_PHY_COMMON_RESET |
> -		   PHY_CFG_PHY_RESET;
> +	unsigned int offset, mask;
>  	int ret;
>  
> -	if (miim->phy_regs) {
> -		ret = regmap_write(miim->phy_regs, offset, 0);
> -		if (ret < 0) {
> -			WARN_ONCE(1, "mscc reset set error %d\n", ret);
> -			return ret;
> -		}
> +	if (!miim->phy_regs || !miim->info)
> +		return 0;

I would put the check for miim->info in the probe. Not checking the
return value from *_get_match_data() is one of the things the bots
reports and we receive patches for. You have the check, but it is
hidden away, and i doubt the bot nor the bot handlers are clever
enough to find it.

       Andrew