ARM: realview: basic device tree implementation

This implements basic device tree boot support for the RealView
platforms, with a basic device tree for ARM PB1176 as an example.

The implementation is done with a new DT-specific board file
using only pre-existing bindings for the basic IRQ, timer and
serial port drivers. A new compatible type is added to the GIC
for the ARM1176.

This implementation uses the MFD syscon handle from day one to
access the system controller registers, and register the devices
using the SoC bus.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh@kernel.org>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig
index 9db2029..565925f 100644 (file)
--- a/arch/arm/mach-realview/Kconfig
+++ b/arch/arm/mach-realview/Kconfig
@@ -1,6 +1,19 @@
 menu "RealView platform type"
        depends on ARCH_REALVIEW
 
+config REALVIEW_DT
+       bool "Support RealView(R) Device Tree based boot"
+       select ARM_GIC
+       select MFD_SYSCON
+       select POWER_RESET
+       select POWER_RESET_VERSATILE
+       select POWER_SUPPLY
+       select SOC_REALVIEW
+       select USE_OF
+       help
+         Include support for booting the ARM(R) RealView(R) evaluation
+         boards using a device tree machine description.
+
 config MACH_REALVIEW_EB
        bool "Support RealView(R) Emulation Baseboard"
        select ARM_GIC

diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile
index 541fa4c..e07fdf7 100644 (file)
--- a/arch/arm/mach-realview/Makefile
+++ b/arch/arm/mach-realview/Makefile
@@ -3,6 +3,7 @@
 #
 
 obj-y                                  := core.o
+obj-$(CONFIG_REALVIEW_DT)              += realview-dt.o
 obj-$(CONFIG_MACH_REALVIEW_EB)         += realview_eb.o
 obj-$(CONFIG_MACH_REALVIEW_PB11MP)     += realview_pb11mp.o
 obj-$(CONFIG_MACH_REALVIEW_PB1176)     += realview_pb1176.o

diff --git a/arch/arm/mach-realview/realview-dt.c b/arch/arm/mach-realview/realview-dt.c
new file mode 100644 (file)
index 0000000..cc28b89
--- /dev/null
+++ b/arch/arm/mach-realview/realview-dt.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/of_platform.h>
+#include <asm/mach/arch.h>
+#include <asm/hardware/cache-l2x0.h>
+#include "core.h"
+
+static const char *realview_dt_platform_compat[] __initconst = {
+       "arm,realview-eb",
+       "arm,realview-pb1176",
+       "arm,realview-pb11mp",
+       "arm,realview-pba8",
+       "arm,realview-pbx",
+       NULL,
+};
+
+DT_MACHINE_START(REALVIEW_DT, "ARM RealView Machine (Device Tree Support)")
+#ifdef CONFIG_ZONE_DMA
+       .dma_zone_size  = SZ_256M,
+#endif
+       .dt_compat      = realview_dt_platform_compat,
+       .l2c_aux_val = 0x0,
+       .l2c_aux_mask = ~0x0,
+MACHINE_END

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 38493ff..7f9be07 100644 (file)
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1041,6 +1041,8 @@ gic_of_init(struct device_node *node, struct device_node *parent)
        return 0;
 }
 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
+IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
+IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);