[PATCH v3] sunxi-irq: Fix Kconfig dependency on GENERIC_IRQ_CHIP

[Andre Przywara]

The Allwinner NMI irqchip driver requires GENERIC_IRQ_CHIP, but
we can't select it directly, because there is no specific Kconfig entry
for the driver. Compiling this NMI driver with certain arm64
configurations thus fails due to the missing dependency:

drivers/built-in.o: In function `sunxi_sc_nmi_set_type':
drivers/irqchip/irq-sunxi-nmi.c:114: undefined reference to `irq_setup_alt_chip'
drivers/built-in.o: In function `irq_domain_add_linear':
include/linux/irqdomain.h:253: undefined reference to `irq_generic_chip_ops'
include/linux/irqdomain.h:253: undefined reference to `irq_generic_chip_ops'
drivers/built-in.o: In function `sunxi_sc_nmi_irq_init':
drivers/irqchip/irq-sunxi-nmi.c:146: undefined reference to `irq_alloc_domain_generic_chips'
drivers/irqchip/irq-sunxi-nmi.c:161: undefined reference to `irq_get_domain_generic_chip'
drivers/irqchip/irq-sunxi-nmi.c:170: undefined reference to `irq_gc_mask_clr_bit'
drivers/irqchip/irq-sunxi-nmi.c:171: undefined reference to `irq_gc_mask_set_bit'
drivers/irqchip/irq-sunxi-nmi.c:172: undefined reference to `irq_gc_ack_set_bit'
drivers/irqchip/irq-sunxi-nmi.c:170: undefined reference to `irq_gc_mask_clr_bit'

Add separate Kconfig options for both Allwinner specific irqchip
drivers and select GENERIC_IRQ_CHIP for the NMI driver.
The older sun4i IRQ driver only gets selected when support for these
specific SoCs is compiled, while the NMI driver is selected for all
Allwinner SoCs (copying the current behaviour and covering future SoCs
automatically).

Reported-by: Suzuki K Poulose <Suzuki.Poulose at arm.com>
Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
Hi,

this is a new approach to the problem that Suzuki tried to address
already.
It separates the sun4i IRQ controller driver and the NMI driver as
Maxime requested.
While there should be no difference for the NMI driver, the sun4i
driver now only gets selected for certain SoCs, which is admittedly
a bold call for -rc5. If people find this too risky, I can bring the
sun4i in line with the NMI driver (selected for all ARCH_SUNXI) for
this release and re-create the more selective dependency as a merge
window patch, so that it gets more testing.
Please let me know.

Cheers,
Andre.

 arch/arm/mach-sunxi/Kconfig | 3 ++-
 drivers/irqchip/Kconfig     | 8 ++++++++
 drivers/irqchip/Makefile    | 4 ++--
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index c124d65..c092bc2 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -4,7 +4,6 @@ menuconfig ARCH_SUNXI
 	select ARCH_REQUIRE_GPIOLIB
 	select ARCH_HAS_RESET_CONTROLLER
 	select CLKSRC_MMIO
-	select GENERIC_IRQ_CHIP
 	select PINCTRL
 	select SUN4I_TIMER
 	select RESET_CONTROLLER
@@ -14,11 +13,13 @@ if ARCH_SUNXI
 config MACH_SUN4I
 	bool "Allwinner A10 (sun4i) SoCs support"
 	default ARCH_SUNXI
+	select SUN4I_IRQCHIP
 
 config MACH_SUN5I
 	bool "Allwinner A10s / A13 (sun5i) SoCs support"
 	default ARCH_SUNXI
 	select SUN5I_HSTIMER
+	select SUN4I_IRQCHIP
 
 config MACH_SUN6I
 	bool "Allwinner A31 (sun6i) SoCs support"
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 3e12479..94f3f42 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -165,6 +165,14 @@ config ST_IRQCHIP
 	help
 	  Enables SysCfg Controlled IRQs on STi based platforms.
 
+config SUN4I_IRQCHIP
+	bool
+
+config SUNXI_NMI
+	bool "Allwinner SoC NMI controller"
+	default ARCH_SUNXI
+	select GENERIC_IRQ_CHIP
+
 config TANGO_IRQ
 	bool
 	select IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index b03cfcb..34f2964 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -19,8 +19,8 @@ obj-$(CONFIG_CLPS711X_IRQCHIP)		+= irq-clps711x.o
 obj-$(CONFIG_OR1K_PIC)			+= irq-or1k-pic.o
 obj-$(CONFIG_ORION_IRQCHIP)		+= irq-orion.o
 obj-$(CONFIG_OMAP_IRQCHIP)		+= irq-omap-intc.o
-obj-$(CONFIG_ARCH_SUNXI)		+= irq-sun4i.o
-obj-$(CONFIG_ARCH_SUNXI)		+= irq-sunxi-nmi.o
+obj-$(CONFIG_SUN4I_IRQCHIP)		+= irq-sun4i.o
+obj-$(CONFIG_SUNXI_NMI)			+= irq-sunxi-nmi.o
 obj-$(CONFIG_ARCH_SPEAR3XX)		+= spear-shirq.o
 obj-$(CONFIG_ARM_GIC)			+= irq-gic.o irq-gic-common.o
 obj-$(CONFIG_REALVIEW_DT)		+= irq-gic-realview.o
-- 
2.7.4