[PATCH v2 2/4] phy: Include NC-SI in phy setup

[Samuel Mendoza-Jonas]

Add NC-SI to the usual phy handling. This makes two notable changes:
- Somewhat similar to a fixed phy, phy_connect() will create an NC-SI
phy if CONFIG_PHY_NCSI is defined.
- An early return is added to phy_read() and phy_write() to handle a
case like the NC-SI phy which does not define a bus.

Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
---
 drivers/net/phy/phy.c   |  7 +++++++
 include/phy.h           | 11 +++++++++++
 include/phy_interface.h |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index c1c1af9abd..dc68f25ebf 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -539,6 +539,9 @@ int phy_init(void)
 #endif
 #ifdef CONFIG_PHY_FIXED
 	phy_fixed_init();
+#endif
+#ifdef CONFIG_PHY_NCSI
+	phy_ncsi_init();
 #endif
 	return 0;
 }
@@ -947,6 +950,10 @@ struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 	phydev = phy_connect_fixed(bus, dev, interface);
 #endif
 
+#ifdef CONFIG_PHY_NCSI
+	phydev = phy_device_create(bus, 0, PHY_NCSI_ID, false, interface);
+#endif
+
 	if (!phydev)
 		phydev = phy_find_by_mask(bus, mask, interface);
 
diff --git a/include/phy.h b/include/phy.h
index 297fc7a78e..56bd146e2c 100644
--- a/include/phy.h
+++ b/include/phy.h
@@ -163,6 +163,11 @@ static inline int phy_read(struct phy_device *phydev, int devad, int regnum)
 {
 	struct mii_dev *bus = phydev->bus;
 
+	if (!bus || !bus->read) {
+		debug("%s: No bus configured\n", __func__);
+		return -1;
+	}
+
 	return bus->read(bus, phydev->addr, devad, regnum);
 }
 
@@ -171,6 +176,11 @@ static inline int phy_write(struct phy_device *phydev, int devad, int regnum,
 {
 	struct mii_dev *bus = phydev->bus;
 
+	if (!bus || !bus->read) {
+		debug("%s: No bus configured\n", __func__);
+		return -1;
+	}
+
 	return bus->write(bus, phydev->addr, devad, regnum, val);
 }
 
@@ -312,6 +322,7 @@ int phy_vitesse_init(void);
 int phy_xilinx_init(void);
 int phy_mscc_init(void);
 int phy_fixed_init(void);
+int phy_ncsi_init(void);
 
 int board_phy_config(struct phy_device *phydev);
 int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id);
diff --git a/include/phy_interface.h b/include/phy_interface.h
index c6823189f8..9e334bb47d 100644
--- a/include/phy_interface.h
+++ b/include/phy_interface.h
@@ -31,6 +31,7 @@ typedef enum {
 	PHY_INTERFACE_MODE_XLAUI,
 	PHY_INTERFACE_MODE_CAUI2,
 	PHY_INTERFACE_MODE_CAUI4,
+	PHY_INTERFACE_MODE_NCSI,
 	PHY_INTERFACE_MODE_NONE,	/* Must be last */
 
 	PHY_INTERFACE_MODE_COUNT,
@@ -58,6 +59,7 @@ static const char * const phy_interface_strings[] = {
 	[PHY_INTERFACE_MODE_XLAUI]		= "xlaui4",
 	[PHY_INTERFACE_MODE_CAUI2]		= "caui2",
 	[PHY_INTERFACE_MODE_CAUI4]		= "caui4",
+	[PHY_INTERFACE_MODE_NCSI]		= "NC-SI",
 	[PHY_INTERFACE_MODE_NONE]		= "",
 };
 
-- 
2.21.0