Unverified Commit 8bb66174 authored by Palmer Dabbelt's avatar Palmer Dabbelt
Browse files

riscv: K210: Add a built-in device tree 



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: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 2d268251

arch/riscv/Kconfig.socs

+16 −1
Original line number Diff line number Diff line
@@ -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

arch/riscv/boot/dts/Makefile

+2 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

subdir-y += sifive

subdir-y += kendryte



obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))

arch/riscv/boot/dts/kendryte/Makefile

+3 −1
Original line number Diff line number Diff line 
# 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))

drivers/soc/kendryte/k210-sysctl.c

+12 −0
Original line number Diff line number Diff line
@@ -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

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