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

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Date:   Mon, 26 Apr 2021 14:25:40 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
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

On Sat, Apr 24, 2021 at 06:01:05PM +0200, Andrew Lunn wrote:
> > +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

Hm, it makes sense. But it is not regression of this patches, is it OK
to mainline it separately?

Regards,
Oleksij
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