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ARM: realview: basic device tree implementation

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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>
This commit is contained in:
Linus Walleij 2014-10-01 09:29:22 +02:00
parent f114040e3e
commit fa6e2eec15
4 changed files with 48 additions and 0 deletions
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13
arch/arm/mach-realview/Kconfig
View file

@ -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

1
arch/arm/mach-realview/Makefile
View file

@ -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

32
arch/arm/mach-realview/realview-dt.c Normal file
View file

@ -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

2
drivers/irqchip/irq-gic.c
View file

@ -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);