linux-kernel - [PATCH v2] of: OF_IRQ: select IRQ_DOMAIN instead of depending on it

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Date: Tue, 13 Feb 2024 14:56:19 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: linux-kernel@...r.kernel.org
Cc: Randy Dunlap <rdunlap@...radead.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Peter Rosin <peda@...ntia.se>,
	devicetree@...r.kernel.org
Subject: [PATCH v2] of: OF_IRQ: select IRQ_DOMAIN instead of depending on it

IRQ_DOMAIN is a hidden (not user visible) symbol. Users cannot set
it directly thru "make *config", so drivers should select it instead
of depending on it if they need it.
Relying on it being set for a dependency is risky.

Consistently using "select" or "depends on" can also help reduce
Kconfig circular dependency issues.

Therefore, change OF_IRQ's use of "depends on" to "select".

This patch reduces one Kconfig circular dependency in
drivers/mux/Kconfig when MUX_MMIO attempts to select REGMAP (a failed
patch), which that driver needs (but does not completely resolve that
issue). [1]

before this patch: (10 lines of detail)
drivers/net/ethernet/arc/Kconfig:19:error: recursive dependency detected!
drivers/net/ethernet/arc/Kconfig:19:	symbol ARC_EMAC_CORE is selected by ARC_EMAC
drivers/net/ethernet/arc/Kconfig:26:	symbol ARC_EMAC depends on OF_IRQ
drivers/of/Kconfig:81:	symbol OF_IRQ depends on IRQ_DOMAIN
kernel/irq/Kconfig:60:	symbol IRQ_DOMAIN is selected by REGMAP
drivers/base/regmap/Kconfig:6:	symbol REGMAP is selected by MUX_MMIO
drivers/mux/Kconfig:48:	symbol MUX_MMIO depends on MULTIPLEXER
drivers/mux/Kconfig:6:	symbol MULTIPLEXER is selected by MDIO_BUS_MUX_MULTIPLEXER
drivers/net/mdio/Kconfig:275:	symbol MDIO_BUS_MUX_MULTIPLEXER depends on MDIO_DEVICE
drivers/net/mdio/Kconfig:6:	symbol MDIO_DEVICE is selected by PHYLIB
drivers/net/phy/Kconfig:16:	symbol PHYLIB is selected by ARC_EMAC_CORE

after this patch: (5 lines of detail)
drivers/mux/Kconfig:6:error: recursive dependency detected!
drivers/mux/Kconfig:6:	symbol MULTIPLEXER is selected by MDIO_BUS_MUX_MULTIPLEXER
drivers/net/mdio/Kconfig:275:	symbol MDIO_BUS_MUX_MULTIPLEXER depends on MDIO_BUS
drivers/net/mdio/Kconfig:13:	symbol MDIO_BUS is selected by REGMAP
drivers/base/regmap/Kconfig:6:	symbol REGMAP is selected by MUX_MMIO
drivers/mux/Kconfig:48:	symbol MUX_MMIO depends on MULTIPLEXER

[1] https://lore.kernel.org/lkml/20230210115625.GA30942@pengutronix.de/

Fixes: 63c60e3a6dc3 ("of: OF_IRQ should depend on IRQ_DOMAIN")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Rob Herring <robh@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Peter Rosin <peda@...ntia.se>
Cc: devicetree@...r.kernel.org
---
v2: update patch description, rebase & resend

 drivers/of/Kconfig |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -- a/drivers/of/Kconfig b/drivers/of/Kconfig
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -80,7 +80,8 @@ config OF_ADDRESS

 config OF_IRQ
 	def_bool y
-	depends on !SPARC && IRQ_DOMAIN
+	depends on !SPARC
+	select IRQ_DOMAIN

 config OF_RESERVED_MEM
 	def_bool OF_EARLY_FLATTREE