ARM: shmobile: kzm9g: Reference DT implementation

Provide alternate board code for the kzm9g to demonstrate
how DT may be used given the current state of driver
device tree support. This is intended to act as a reference
for mach-shmobile developers.

Some notes:

* Brings up the GIC interrupt handler using device tree
* Brings up the following device using device tree:
  - MMCIF (MMC)
* Does not bring up the INTC interrupt controller at all,
  thus external devices may not be used. In particular,
  the SMSC ethernet device may not be used and thus
  NFS root may not be used.
* Uses existing C code and not device tree to initialise the following,
  which are needed for a working board:
  - SCIF (Serial)
  - CMT (Clock)
  - PFC (GPIO)

To use this alternate board code instead of the normal board code,
CONFIG_MACH_KZM9G_REFERENCE should be selected in the kernel config.
And the sh73a0-kzm9g-reference.dtb flattened device tree blob should be used.

Includes fix by Thierry Reding to no longer use gic_handle_irq()

Includes fixes by Guennadi Liakhovetski for recent pinmux changes.

Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index b15d4ffcd9a2..0c48af9b1a0f 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -129,6 +129,16 @@ config MACH_KZM9G
 	select SND_SOC_AK4642 if SND_SIMPLE_CARD
 	select USE_OF
 
+config MACH_KZM9G_REFERENCE
+	bool "KZM-A9-GT board - Reference Device Tree Implementation"
+	depends on MACH_KZM9G
+	---help---
+	   Use reference implementation of KZM-A9-GT board support
+	   which makes as greater use of device tree at the expense
+	   of not supporting a number of devices.
+
+	   This is intended to aid developers
+
 comment "SH-Mobile System Configuration"
 
 config CPU_HAS_INTEVT