On Wed, Nov 18, 2020 at 09:30:07PM +0100, Christian Eggers wrote:

Interrupts are required for TX time stamping. Probably they could also
be used for PHY connection status.

This patch only adds the basic infrastructure for interrupts, no
interrupts are finally enabled nor handled.

Signed-off-by: Christian Eggers <ceggers@arri.de>
---

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

+static int ksz9477_enable_port_interrupts(struct ksz_device *dev, bool enable)
+{
+	u32 data, mask = GENMASK(dev->port_cnt - 1, 0);
+	int ret;
+
+	ret = ksz_read32(dev, REG_SW_PORT_INT_MASK__4, &data);
+	if (ret)
+		return ret;
+
+	/* bits in REG_SW_PORT_INT_MASK__4 are low active */

s/low active/active low/

+	if (enable)
+		data &= ~mask;
+	else
+		data |= mask;
+
+	return ksz_write32(dev, REG_SW_PORT_INT_MASK__4, data);
+}