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From: Andrew Lunn <andrew@lunn.ch>
To: Colin Foster <colin.foster@in-advantage.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	Vladimir Oltean <vladimir.oltean@nxp.com>,
	Claudiu Manoil <claudiu.manoil@nxp.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	UNGLinuxDriver@microchip.com,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>
Subject: Re: [PATCH v1 net-next 1/3] net: mdio: mscc-miim: convert to a regmap implementation
Date: Sat, 20 Nov 2021 16:09:18 +0100	[thread overview]
Message-ID: <YZkPnida0Kd0sG8x@lunn.ch> (raw)
In-Reply-To: <20211119213918.2707530-2-colin.foster@in-advantage.com>

> @@ -73,22 +84,30 @@ static int mscc_miim_wait_pending(struct mii_bus *bus)
>  static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)
>  {
>  	struct mscc_miim_dev *miim = bus->priv;
> +	int ret, err;
>  	u32 val;
> -	int ret;
>  
>  	ret = mscc_miim_wait_pending(bus);
>  	if (ret)
>  		goto out;
>  
> -	writel(MSCC_MIIM_CMD_VLD | (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> -	       (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) | MSCC_MIIM_CMD_OPR_READ,
> -	       miim->regs + MSCC_MIIM_REG_CMD);
> +	err = regmap_write(miim->regs, MSCC_MIIM_REG_CMD, MSCC_MIIM_CMD_VLD |
> +			   (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> +			   (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> +			   MSCC_MIIM_CMD_OPR_READ);
> +
> +	if (err < 0)
> +		WARN_ONCE(1, "mscc miim write cmd reg error %d\n", err);

You should probably return ret here. If the setup fails, i doubt you
will get anything useful from the hardware.

>  
>  	ret = mscc_miim_wait_ready(bus);
>  	if (ret)
>  		goto out;
>  
> -	val = readl(miim->regs + MSCC_MIIM_REG_DATA);
> +	err = regmap_read(miim->regs, MSCC_MIIM_REG_DATA, &val);
> +
> +	if (err < 0)
> +		WARN_ONCE(1, "mscc miim read data reg error %d\n", err);

Same here.

> +
>  	if (val & MSCC_MIIM_DATA_ERROR) {
>  		ret = -EIO;
>  		goto out;
> @@ -103,18 +122,20 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
>  			   int regnum, u16 value)
>  {
>  	struct mscc_miim_dev *miim = bus->priv;
> -	int ret;
> +	int err, ret;
>  
>  	ret = mscc_miim_wait_pending(bus);
>  	if (ret < 0)
>  		goto out;
>  
> -	writel(MSCC_MIIM_CMD_VLD | (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> -	       (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> -	       (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
> -	       MSCC_MIIM_CMD_OPR_WRITE,
> -	       miim->regs + MSCC_MIIM_REG_CMD);
> +	err = regmap_write(miim->regs, MSCC_MIIM_REG_CMD, MSCC_MIIM_CMD_VLD |
> +			   (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> +			   (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> +			   (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
> +			   MSCC_MIIM_CMD_OPR_WRITE);
>  
> +	if (err < 0)
> +		WARN_ONCE(1, "mscc miim write error %d\n", err);

And here, etc.

    Andrew

  parent reply	other threads:[~2021-11-20 15:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-19 21:39 [PATCH v1 net-next 0/3] update seville to use shared mdio driver Colin Foster
2021-11-19 21:39 ` [PATCH v1 net-next 1/3] net: mdio: mscc-miim: convert to a regmap implementation Colin Foster
2021-11-20  3:56   ` Jakub Kicinski
2021-11-20 21:23     ` Colin Foster
2021-11-20 15:09   ` Andrew Lunn [this message]
2021-11-20 21:25     ` Colin Foster
2021-11-21 17:32   ` Vladimir Oltean
2021-11-19 21:39 ` [PATCH v1 net-next 2/3] net: dsa: ocelot: seville: utilize of_mdiobus_register Colin Foster
2021-11-19 21:39 ` [PATCH v1 net-next 3/3] net: dsa: ocelot: felix: switch to mdio-mscc-miim driver for indirect mdio access Colin Foster
2021-11-21 17:44   ` Vladimir Oltean
2021-11-22 17:21     ` Colin Foster

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