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

[Andrew Lunn]

> +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