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riscv: K210: Add a built-in device tree

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The K210's bootloader does not provide a device tree. Give the ability
to providea builtin one with the SOC_KENDRYTE_K210_BUILTIN_DTB option.
If selected, this option result in the definition of a builtin DTB
entry in the k210 sysctl driver.

If defined, the builtin DTB entry points to the default k210.dts device
tree file and is keyed with the vendor ID 0x4B5, the arch ID
0xE59889E6A5A04149 ("Canaan AI" in UTF-8 coded Chinese) and the impl ID
0x4D41495832303030 ("MAIX200"). These values are reported by the SiPEED
MAIXDUINO board, the SiPEED MAIX Go board and the SiPEED Dan Dock board.

[Thanks to Damien for the K210 IDs]
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Palmer Dabbelt 2020-04-14 13:43:25 +09:00
parent 2d2682512f
commit 8bb6617427
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
4 changed files with 33 additions and 2 deletions
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17
arch/riscv/Kconfig.socs
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@ -24,11 +24,26 @@ config SOC_VIRT
config SOC_KENDRYTE
bool "Kendryte K210 SoC"
depends on !MMU
select BUILTIN_DTB
select SERIAL_SIFIVE if TTY
select SERIAL_SIFIVE_CONSOLE if TTY
select SIFIVE_PLIC
help
This enables support for Kendryte K210 SoC platform hardware.
config SOC_KENDRYTE_K210_DTB
def_bool y
depends on SOC_KENDRYTE_K210_DTB_BUILTIN
config SOC_KENDRYTE_K210_DTB_BUILTIN
bool "Builtin device tree for the Kendryte K210"
depends on SOC_KENDRYTE
default y
select OF
select BUILTIN_DTB
select SOC_KENDRYTE_K210_DTB
help
Builds a device tree for the Kendryte K210 into the Linux image.
This option should be selected if no bootloader is being used.
If unsure, say Y.
endmenu

2
arch/riscv/boot/dts/Makefile
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@ -1,3 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
subdir-y += sifive
subdir-y += kendryte
obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))

4
arch/riscv/boot/dts/kendryte/Makefile
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@ -1,2 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
dtb-$(CONFIG_SOC_KENDRYTE) += k210.dtb
dtb-$(CONFIG_SOC_KENDRYTE_K210_DTB) += k210.dtb
obj-$(CONFIG_SOC_KENDRYTE_K210_DTB_BUILTIN) += $(addsuffix .o, $(dtb-y))

12
drivers/soc/kendryte/k210-sysctl.c
View File

@ -246,3 +246,15 @@ static void __init k210_soc_early_init(const void *fdt)
iounmap(regs);
}
SOC_EARLY_INIT_DECLARE(generic_k210, "kendryte,k210", k210_soc_early_init);
#ifdef CONFIG_SOC_KENDRYTE_K210_DTB_BUILTIN
/*
* Generic entry for the default k210.dtb embedded DTB for boards with:
* - Vendor ID: 0x4B5
* - Arch ID: 0xE59889E6A5A04149 (= "Canaan AI" in UTF-8 encoded Chinese)
* - Impl ID: 0x4D41495832303030 (= "MAIX2000")
* These values are reported by the SiPEED MAXDUINO, SiPEED MAIX GO and
* SiPEED Dan dock boards.
*/
SOC_BUILTIN_DTB_DECLARE(k210, 0x4B5, 0xE59889E6A5A04149, 0x4D41495832303030);
#endif