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156 lines
4.9 KiB
Diff
156 lines
4.9 KiB
Diff
From f6459ef9602c16b02516be4848a77d30ce75d168 Mon Sep 17 00:00:00 2001
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From: notro <notro@tronnes.org>
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Date: Wed, 9 Jul 2014 14:46:08 +0200
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Subject: [PATCH 049/114] BCM2708: Add core Device Tree support
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Add the bare minimum needed to boot BCM2708 from a Device Tree.
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Signed-off-by: Noralf Tronnes <notro@tronnes.org>
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BCM2708: DT: change 'axi' nodename to 'soc'
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Change DT node named 'axi' to 'soc' so it matches ARCH_BCM2835.
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The VC4 bootloader fills in certain properties in the 'axi' subtree,
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but since this is part of an upstreaming effort, the name is changed.
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Signed-off-by: Noralf Tronnes notro@tronnes.org
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---
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arch/arm/boot/dts/Makefile | 1 +
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arch/arm/boot/dts/bcm2708-rpi-b.dts | 8 ++++++++
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arch/arm/boot/dts/bcm2708.dtsi | 27 +++++++++++++++++++++++++++
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arch/arm/mach-bcm2708/Kconfig | 8 ++++++++
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arch/arm/mach-bcm2708/bcm2708.c | 24 ++++++++++++++++++++++++
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5 files changed, 68 insertions(+)
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create mode 100644 arch/arm/boot/dts/bcm2708-rpi-b.dts
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create mode 100644 arch/arm/boot/dts/bcm2708.dtsi
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--- a/arch/arm/boot/dts/Makefile
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+++ b/arch/arm/boot/dts/Makefile
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@@ -53,6 +53,7 @@ dtb-$(CONFIG_ARCH_AT91) += at91-sama5d4e
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dtb-$(CONFIG_ARCH_ATLAS6) += atlas6-evb.dtb
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dtb-$(CONFIG_ARCH_AXXIA) += axm5516-amarillo.dtb
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+dtb-$(CONFIG_BCM2708_DT) += bcm2708-rpi-b.dtb
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dtb-$(CONFIG_ARCH_BCM2835) += bcm2835-rpi-b.dtb
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dtb-$(CONFIG_ARCH_BCM_5301X) += bcm4708-netgear-r6250.dtb
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dtb-$(CONFIG_ARCH_BCM_63XX) += bcm963138dvt.dtb
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--- /dev/null
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+++ b/arch/arm/boot/dts/bcm2708-rpi-b.dts
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@@ -0,0 +1,8 @@
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+/dts-v1/;
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+
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+/include/ "bcm2708.dtsi"
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+ model = "Raspberry Pi";
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+};
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--- /dev/null
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+++ b/arch/arm/boot/dts/bcm2708.dtsi
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@@ -0,0 +1,27 @@
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+/include/ "skeleton.dtsi"
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+ model = "BCM2708";
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+
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+ chosen {
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+ /*
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+ bootargs must be 1024 characters long because the
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+ VC bootloader can't expand it
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+ */
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+ bootargs = "console=ttyAMA0 ";
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+ };
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+
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+ soc {
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+ compatible = "simple-bus";
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+ #address-cells = <1>;
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+ #size-cells = <1>;
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+ ranges = <0x7e000000 0x20000000 0x02000000>;
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+ };
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+
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+ clocks {
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+ compatible = "simple-bus";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ };
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+};
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--- a/arch/arm/mach-bcm2708/Kconfig
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+++ b/arch/arm/mach-bcm2708/Kconfig
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@@ -9,6 +9,14 @@ config MACH_BCM2708
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help
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Include support for the Broadcom(R) BCM2708 platform.
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+config BCM2708_DT
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+ bool "BCM2708 Device Tree support"
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+ depends on MACH_BCM2708
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+ default n
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+ select USE_OF
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+ help
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+ Enable Device Tree support for BCM2708
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+
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config BCM2708_GPIO
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bool "BCM2708 gpio support"
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depends on MACH_BCM2708
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--- a/arch/arm/mach-bcm2708/bcm2708.c
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+++ b/arch/arm/mach-bcm2708/bcm2708.c
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@@ -33,6 +33,7 @@
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#include <linux/cnt32_to_63.h>
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#include <linux/io.h>
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#include <linux/module.h>
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+#include <linux/of_platform.h>
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#include <linux/spi/spi.h>
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#include <linux/w1-gpio.h>
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@@ -734,6 +735,22 @@ static void bcm2708_power_off(void)
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}
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}
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+#ifdef CONFIG_OF
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+static void __init bcm2708_dt_init(void)
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+{
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+ int ret;
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+
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+ of_clk_init(NULL);
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+ ret = of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
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+ if (ret) {
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+ pr_err("of_platform_populate failed: %d\n", ret);
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+ BUG();
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+ }
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+}
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+#else
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+static void __init bcm2708_dt_init(void) { }
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+#endif /* CONFIG_OF */
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+
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void __init bcm2708_init(void)
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{
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int i;
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@@ -745,6 +762,7 @@ void __init bcm2708_init(void)
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pm_power_off = bcm2708_power_off;
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bcm2708_init_clocks();
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+ bcm2708_dt_init();
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bcm_register_device(&bcm2708_dmaman_device);
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bcm_register_device(&bcm2708_vcio_device);
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@@ -965,6 +983,11 @@ static void __init board_reserve(void)
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#endif
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}
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+static const char * const bcm2708_compat[] = {
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+ "brcm,bcm2708",
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+ NULL
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+};
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+
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MACHINE_START(BCM2708, "BCM2708")
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/* Maintainer: Broadcom Europe Ltd. */
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.map_io = bcm2708_map_io,
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@@ -974,6 +997,7 @@ MACHINE_START(BCM2708, "BCM2708")
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.init_early = bcm2708_init_early,
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.reserve = board_reserve,
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.restart = bcm2708_restart,
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+ .dt_compat = bcm2708_compat,
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MACHINE_END
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module_param(boardrev, uint, 0644);
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