linux-kernel - Re: [PATCH net-next v6 08/10] net: dsa: microchip: Add Microchip KSZ8863 SMI based driver support

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Message-ID: <YIRAwY+5yLJf1+CH@lunn.ch>
Date:   Sat, 24 Apr 2021 18:01:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        kernel@...gutronix.de, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH net-next v6 08/10] net: dsa: microchip: Add Microchip
 KSZ8863 SMI based driver support

> +static int ksz8863_mdio_read(void *ctx, const void *reg_buf, size_t reg_len,
> +			     void *val_buf, size_t val_len)
> +{
> +	struct ksz_device *dev = ctx;
> +	struct ksz8 *ksz8 = dev->priv;
> +	struct mdio_device *mdev = ksz8->priv;
> +	u8 reg = *(u8 *)reg_buf;
> +	u8 *val = val_buf;
> +	int ret = 0;
> +	int i;

...


> +
> +	mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED);
> +	for (i = 0; i < val_len; i++) {
> +		int tmp = reg + i;
> +
> +		ret = __mdiobus_read(mdev->bus, ((tmp & 0xE0) >> 5) |
> +				     SMI_KSZ88XX_READ_PHY, tmp);
> +		if (ret < 0)
> +			goto out;
> +
> +		val[i] = ret;
> +	}
> +	ret = 0;
> +
> + out:
> +	mutex_unlock(&mdev->bus->mdio_lock);
> +
> +	return ret;
> +}
> +
> +static int ksz8863_mdio_write(void *ctx, const void *data, size_t count)
> +{
> +	struct ksz_device *dev = ctx;
> +	struct ksz8 *ksz8 = dev->priv;
> +	struct mdio_device *mdev = ksz8->priv;
> +	u8 *val = (u8 *)(data + 4);
> +	u32 reg = *(u32 *)data;
> +	int ret = 0;
> +	int i;

...


> +static const struct of_device_id ksz8863_dt_ids[] = {
> +	{ .compatible = "microchip,ksz8863" },
> +	{ .compatible = "microchip,ksz8873" },
> +	{ },
> +};

Is there code somewhere which verifies that what has been found really
does match what is in device tree? We don't want errors in the device
tree to be ignored.

     Andrew