Messages in this thread | | | Date | Tue, 02 Jan 2018 17:32:27 +0100 | From | Paul Cercueil <> | Subject | Re: [PATCH v5 10/15] MIPS: ingenic: Add machine info for supported boards |
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Hi PrasannaKumar,
Le mar. 2 janv. 2018 à 17:02, PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> a écrit : > Hi Paul, > > On 2 January 2018 at 20:38, Paul Cercueil <paul@crapouillou.net> > wrote: >> This makes sure that 'mips_machtype' will be initialized to the SoC >> version used on the board. >> >> Signed-off-by: Paul Cercueil <paul@crapouillou.net> >> --- >> arch/mips/Kconfig | 1 + >> arch/mips/jz4740/Makefile | 2 +- >> arch/mips/jz4740/boards.c | 12 ++++++++++++ >> arch/mips/jz4740/setup.c | 34 +++++++++++++++++++++++++++++----- >> 4 files changed, 43 insertions(+), 6 deletions(-) >> create mode 100644 arch/mips/jz4740/boards.c >> >> v2: No change >> v3: No change >> v4: No change >> v5: Use SPDX license identifier >> >> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig >> index 350a990fc719..83243e427e36 100644 >> --- a/arch/mips/Kconfig >> +++ b/arch/mips/Kconfig >> @@ -376,6 +376,7 @@ config MACH_INGENIC >> select BUILTIN_DTB >> select USE_OF >> select LIBFDT >> + select MIPS_MACHINE >> >> config LANTIQ >> bool "Lantiq based platforms" >> diff --git a/arch/mips/jz4740/Makefile b/arch/mips/jz4740/Makefile >> index 88d6aa7d000b..fc2d3b3c4a80 100644 >> --- a/arch/mips/jz4740/Makefile >> +++ b/arch/mips/jz4740/Makefile >> @@ -6,7 +6,7 @@ >> # Object file lists. >> >> obj-y += prom.o time.o reset.o setup.o \ >> - platform.o timer.o >> + platform.o timer.o boards.o >> >> CFLAGS_setup.o = -I$(src)/../../../scripts/dtc/libfdt >> >> diff --git a/arch/mips/jz4740/boards.c b/arch/mips/jz4740/boards.c >> new file mode 100644 >> index 000000000000..13b0bddd8cb7 >> --- /dev/null >> +++ b/arch/mips/jz4740/boards.c >> @@ -0,0 +1,12 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Ingenic boards support >> + * Copyright 2017, Paul Cercueil <paul@crapouillou.net> >> + */ >> + >> +#include <asm/bootinfo.h> >> +#include <asm/mips_machine.h> >> + >> +MIPS_MACHINE(MACH_INGENIC_JZ4740, "qi,lb60", "Qi Hardware Ben >> Nanonote", NULL); >> +MIPS_MACHINE(MACH_INGENIC_JZ4780, "img,ci20", >> + "Imagination Technologies CI20", NULL); >> diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c >> index 6d0152321819..afd84ee966e8 100644 >> --- a/arch/mips/jz4740/setup.c >> +++ b/arch/mips/jz4740/setup.c >> @@ -22,6 +22,7 @@ >> #include <linux/of_fdt.h> >> >> #include <asm/bootinfo.h> >> +#include <asm/mips_machine.h> >> #include <asm/prom.h> >> >> #include <asm/mach-jz4740/base.h> >> @@ -53,16 +54,34 @@ static void __init jz4740_detect_mem(void) >> add_memory_region(0, size, BOOT_MEM_RAM); >> } >> >> +static unsigned long __init get_board_mach_type(const void *fdt) >> +{ >> + const struct mips_machine *mach; >> + >> + for (mach = (struct mips_machine *)&__mips_machines_start; >> + mach < (struct mips_machine >> *)&__mips_machines_end; >> + mach++) { >> + if (!fdt_node_check_compatible(fdt, 0, >> mach->mach_id)) >> + return mach->mach_type; >> + } >> + >> + return MACH_INGENIC_JZ4740; >> +} >> + >> void __init plat_mem_setup(void) >> { >> int offset; >> >> + if (!early_init_dt_scan(__dtb_start)) >> + return; >> + >> jz4740_reset_init(); >> - __dt_setup_arch(__dtb_start); >> >> offset = fdt_path_offset(__dtb_start, "/memory"); >> if (offset < 0) >> jz4740_detect_mem(); >> + >> + mips_machtype = get_board_mach_type(__dtb_start); >> } >> >> void __init device_tree_init(void) >> @@ -75,13 +94,18 @@ void __init device_tree_init(void) >> >> const char *get_system_type(void) >> { >> - if (IS_ENABLED(CONFIG_MACH_JZ4780)) >> - return "JZ4780"; >> - >> - return "JZ4740"; >> + return mips_get_machine_name(); >> } >> >> void __init arch_init_irq(void) >> { >> irqchip_init(); >> } >> + >> +static int __init jz4740_machine_setup(void) >> +{ >> + mips_machine_setup(); >> + >> + return 0; >> +} >> +arch_initcall(jz4740_machine_setup); >> -- >> 2.11.0 >> >> > > Why add another file in arch/mips/jz4740/? I think declaring a machine > and compatible string in dts would suffice. Please feel free to > correct me if I am wrong. > > Regards, > PrasannaKumar
The point of this commit is, first, to have a textual description of the board that can then be retrieved in dmesg; then, to properly initialize the mips_machtype early in the boot process. I think you are right and we could have both things just with "model" and "compatible" nodes in devicetree.
Regards, -Paul
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