sh: add support for linking a builtin device tree blob in the kernel
Signed-off-by: Rich Felker <dalias@libc.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 0d5f3a9..ceeda5c 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -739,6 +739,26 @@
menu "Boot options"
+config USE_BUILTIN_DTB
+ bool "Use builtin DTB"
+ default n
+ depends on SH_DEVICE_TREE
+ help
+ Link a device tree blob for particular hardware into the kernel,
+ suppressing use of the DTB pointer provided by the bootloader.
+ This option should only be used with legacy bootloaders that are
+ not capable of providing a DTB to the kernel, or for experimental
+ hardware without stable device tree bindings.
+
+config BUILTIN_DTB_SOURCE
+ string "Source file for builtin DTB"
+ default ""
+ depends on USE_BUILTIN_DTB
+ help
+ Base name (without suffix, relative to arch/sh/boot/dts) for the
+ a DTS file that will be used to produce the DTB linked into the
+ kernel.
+
config ZERO_PAGE_OFFSET
hex
default "0x00010000" if PAGE_SIZE_64KB || SH_RTS7751R2D || \
diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index bf5b3f5..3b2c8b4 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -130,6 +130,8 @@
core-y += arch/sh/kernel/ arch/sh/mm/ arch/sh/boards/
core-$(CONFIG_SH_FPU_EMU) += arch/sh/math-emu/
+core-$(CONFIG_USE_BUILTIN_DTB) += arch/sh/boot/dts/
+
# Mach groups
machdir-$(CONFIG_SOLUTION_ENGINE) += mach-se
machdir-$(CONFIG_SH_HP6XX) += mach-hp6xx
diff --git a/arch/sh/boards/of-generic.c b/arch/sh/boards/of-generic.c
index 911ffb9..1fb6d57 100644
--- a/arch/sh/boards/of-generic.c
+++ b/arch/sh/boards/of-generic.c
@@ -124,13 +124,22 @@
static void __init sh_of_setup(char **cmdline_p)
{
+ struct device_node *root;
+
+#ifdef CONFIG_USE_BUILTIN_DTB
+ unflatten_and_copy_device_tree();
+#else
unflatten_device_tree();
+#endif
board_time_init = sh_of_time_init;
- sh_mv.mv_name = of_flat_dt_get_machine_name();
- if (!sh_mv.mv_name)
- sh_mv.mv_name = "Unknown SH model";
+ sh_mv.mv_name = "Unknown SH model";
+ root = of_find_node_by_path("/");
+ if (root) {
+ of_property_read_string(root, "model", &sh_mv.mv_name);
+ of_node_put(root);
+ }
sh_of_smp_probe();
}
diff --git a/arch/sh/boot/dts/Makefile b/arch/sh/boot/dts/Makefile
new file mode 100644
index 0000000..e5ce3a0
--- /dev/null
+++ b/arch/sh/boot/dts/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_USE_BUILTIN_DTB) += $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_SOURCE)).dtb.o
+
+clean-files := *.dtb.S
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 5d34605..5b9eb70 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -251,7 +251,11 @@
/* Avoid calling an __init function on secondary cpus. */
if (done) return;
+#ifdef CONFIG_USE_BUILTIN_DTB
+ dt_virt = __dtb_start;
+#else
dt_virt = phys_to_virt(dt_phys);
+#endif
if (!dt_virt || !early_init_dt_scan(dt_virt)) {
pr_crit("Error: invalid device tree blob"