net: phy: extend PHY package API to support multiple global address

Current API for PHY package are limited to single address to configure
global settings for the PHY package.

It was found that some PHY package (for example the qca807x, a PHY
package that is shipped with a bundle of 5 PHY) requires multiple PHY
address to configure global settings. An example scenario is a PHY that
have a dedicated PHY for PSGMII/serdes calibrarion and have a specific
PHY in the package where the global PHY mode is set and affects every
other PHY in the package.

Change the API in the following way:
- Change phy_package_join() to take the base addr of the PHY package
  instead of the global PHY addr.
- Make __/phy_package_write/read() require an additional arg that
  select what global PHY address to use by passing the offset from the
  base addr passed on phy_package_join().

Each user of this API is updated to follow this new implementation
following a pattern where an enum is defined to declare the offset of the
addr.

We also drop the check if shared is defined as any user of the
phy_package_read/write is expected to use phy_package_join first. Misuse
of this will correctly trigger a kernel panic for NULL pointer
exception.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
index 7a962050a4d4..6a3d8a754eb8 100644
--- a/drivers/net/phy/mscc/mscc.h
+++ b/drivers/net/phy/mscc/mscc.h
@@ -416,6 +416,11 @@ struct vsc8531_private {
  * gpio_lock: used for PHC operations. Common for all PHYs as the load/save GPIO
  * is shared.
  */
+
+enum vsc85xx_global_phy {
+	VSC88XX_BASE_ADDR = 0,
+};
+
 struct vsc85xx_shared_private {
 	struct mutex gpio_lock;
 };
diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
index 4171f01d34e5..6f74ce0ab1aa 100644
--- a/drivers/net/phy/mscc/mscc_main.c
+++ b/drivers/net/phy/mscc/mscc_main.c
@@ -711,7 +711,7 @@ int phy_base_write(struct phy_device *phydev, u32 regnum, u16 val)
 		dump_stack();
 	}
 
-	return __phy_package_write(phydev, regnum, val);
+	return __phy_package_write(phydev, VSC88XX_BASE_ADDR, regnum, val);
 }
 
 /* phydev->bus->mdio_lock should be locked when using this function */
@@ -722,7 +722,7 @@ int phy_base_read(struct phy_device *phydev, u32 regnum)
 		dump_stack();
 	}
 
-	return __phy_package_read(phydev, regnum);
+	return __phy_package_read(phydev, VSC88XX_BASE_ADDR, regnum);
 }
 
 u32 vsc85xx_csr_read(struct phy_device *phydev,