netdev - [PATCH net-next] net: mscc: ocelot: rethink Kconfig dependencies again

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Date:   Mon, 13 Jul 2020 00:28:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        kuba@...nel.org
Subject: [PATCH net-next] net: mscc: ocelot: rethink Kconfig dependencies again

From: Vladimir Oltean <vladimir.oltean@....com>

Having the users of MSCC_OCELOT_SWITCH_LIB depend on REGMAP_MMIO was a
bad idea, since that symbol is not user-selectable. So we should have
kept a 'select REGMAP_MMIO'.

When we do that, we run into 2 more problems:

- By depending on GENERIC_PHY, we are causing a recursive dependency.
  But it looks like GENERIC_PHY has no other dependencies, and other
  drivers select it, so we can select it too:

drivers/of/Kconfig:69:error: recursive dependency detected!
drivers/of/Kconfig:69:  symbol OF_IRQ depends on IRQ_DOMAIN
kernel/irq/Kconfig:68:  symbol IRQ_DOMAIN is selected by REGMAP
drivers/base/regmap/Kconfig:7:  symbol REGMAP default is visible depending on REGMAP_MMIO
drivers/base/regmap/Kconfig:39: symbol REGMAP_MMIO is selected by MSCC_OCELOT_SWITCH_LIB
drivers/net/ethernet/mscc/Kconfig:15:   symbol MSCC_OCELOT_SWITCH_LIB is selected by MSCC_OCELOT_SWITCH
drivers/net/ethernet/mscc/Kconfig:22:   symbol MSCC_OCELOT_SWITCH depends on GENERIC_PHY
drivers/phy/Kconfig:8:  symbol GENERIC_PHY is selected by PHY_BCM_NS_USB3
drivers/phy/broadcom/Kconfig:41:        symbol PHY_BCM_NS_USB3 depends on MDIO_BUS
drivers/net/phy/Kconfig:13:     symbol MDIO_BUS depends on MDIO_DEVICE
drivers/net/phy/Kconfig:6:      symbol MDIO_DEVICE is selected by PHYLIB
drivers/net/phy/Kconfig:254:    symbol PHYLIB is selected by ARC_EMAC_CORE
drivers/net/ethernet/arc/Kconfig:19:    symbol ARC_EMAC_CORE is selected by ARC_EMAC
drivers/net/ethernet/arc/Kconfig:25:    symbol ARC_EMAC depends on OF_IRQ

- By depending on PHYLIB, we are causing a recursive dependency. PHYLIB
  only has a single dependency, "depends on NETDEVICES", which we are
  already depending on, so we can again hack our way into conformance by
  turning the PHYLIB dependency into a select.

drivers/of/Kconfig:69:error: recursive dependency detected!
drivers/of/Kconfig:69:  symbol OF_IRQ depends on IRQ_DOMAIN
kernel/irq/Kconfig:68:  symbol IRQ_DOMAIN is selected by REGMAP
drivers/base/regmap/Kconfig:7:  symbol REGMAP default is visible depending on REGMAP_MMIO
drivers/base/regmap/Kconfig:39: symbol REGMAP_MMIO is selected by MSCC_OCELOT_SWITCH_LIB
drivers/net/ethernet/mscc/Kconfig:15:   symbol MSCC_OCELOT_SWITCH_LIB is selected by MSCC_OCELOT_SWITCH
drivers/net/ethernet/mscc/Kconfig:22:   symbol MSCC_OCELOT_SWITCH depends on PHYLIB
drivers/net/phy/Kconfig:254:    symbol PHYLIB is selected by ARC_EMAC_CORE
drivers/net/ethernet/arc/Kconfig:19:    symbol ARC_EMAC_CORE is selected by ARC_EMAC
drivers/net/ethernet/arc/Kconfig:25:    symbol ARC_EMAC depends on OF_IRQ

Fixes: f4d0323bae4e ("net: mscc: ocelot: convert MSCC_OCELOT_SWITCH into a library")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/ocelot/Kconfig    | 1 -
 drivers/net/ethernet/mscc/Kconfig | 8 ++++----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/ocelot/Kconfig b/drivers/net/dsa/ocelot/Kconfig
index 3d3c2a6fb0c0..1788297f6bc6 100644
--- a/drivers/net/dsa/ocelot/Kconfig
+++ b/drivers/net/dsa/ocelot/Kconfig
@@ -5,7 +5,6 @@ config NET_DSA_MSCC_FELIX
 	depends on NET_VENDOR_MICROSEMI
 	depends on NET_VENDOR_FREESCALE
 	depends on HAS_IOMEM
-	depends on REGMAP_MMIO
 	select MSCC_OCELOT_SWITCH_LIB
 	select NET_DSA_TAG_OCELOT
 	select FSL_ENETC_MDIO
diff --git a/drivers/net/ethernet/mscc/Kconfig b/drivers/net/ethernet/mscc/Kconfig
index 3cfd1b629886..ee7bb7e24e8e 100644
--- a/drivers/net/ethernet/mscc/Kconfig
+++ b/drivers/net/ethernet/mscc/Kconfig
@@ -11,8 +11,10 @@ config NET_VENDOR_MICROSEMI

 if NET_VENDOR_MICROSEMI

-# Users should depend on NET_SWITCHDEV, HAS_IOMEM, PHYLIB and REGMAP_MMIO
+# Users should depend on NET_SWITCHDEV, HAS_IOMEM
 config MSCC_OCELOT_SWITCH_LIB
+	select REGMAP_MMIO
+	select PHYLIB
 	tristate
 	help
 	  This is a hardware support library for Ocelot network switches. It is
@@ -21,12 +23,10 @@ config MSCC_OCELOT_SWITCH_LIB
 config MSCC_OCELOT_SWITCH
 	tristate "Ocelot switch driver"
 	depends on NET_SWITCHDEV
-	depends on GENERIC_PHY
-	depends on REGMAP_MMIO
 	depends on HAS_IOMEM
-	depends on PHYLIB
 	depends on OF_NET
 	select MSCC_OCELOT_SWITCH_LIB
+	select GENERIC_PHY
 	help
 	  This driver supports the Ocelot network switch device as present on
 	  the Ocelot SoCs (VSC7514).
-- 
2.25.1