linux-kernel - Re: [PATCH v5 10/15] MIPS: ingenic: Add machine info for supported boards

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Date:   Tue, 2 Jan 2018 21:32:57 +0530
From:   PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        devicetree@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        linux-mips@...ux-mips.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v5 10/15] MIPS: ingenic: Add machine info for supported boards

Hi Paul,

On 2 January 2018 at 20:38, Paul Cercueil <paul@...pouillou.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@...pouillou.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@...pouillou.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