linux-kernel - Re: [PATCH v7 10/14] MIPS: ingenic: Detect machtype from SoC compatible string

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Message-ID: <20180116220630.GD29126@saruman>
Date:   Tue, 16 Jan 2018 22:06:31 +0000
From:   James Hogan <jhogan@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH v7 10/14] MIPS: ingenic: Detect machtype from SoC
 compatible string

On Tue, Jan 16, 2018 at 04:48:00PM +0100, Paul Cercueil wrote:
> Previously, the mips_machtype variable was always initialized
> to MACH_INGENIC_JZ4740 even if running on different SoCs.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  arch/mips/jz4740/prom.c  |  1 -
>  arch/mips/jz4740/setup.c | 22 +++++++++++++++++++---
>  2 files changed, 19 insertions(+), 4 deletions(-)
> 
>  v2: No change
>  v3: No change
>  v4: No change
>  v5: Use SPDX license identifier
>  v6: Init mips_machtype from DT compatible string instead of using
>      MIPS_MACHINE
>  v7: Fix system name not initialized
> 
> diff --git a/arch/mips/jz4740/prom.c b/arch/mips/jz4740/prom.c
> index a62dd8e6ecf9..eb9f2f97bedb 100644
> --- a/arch/mips/jz4740/prom.c
> +++ b/arch/mips/jz4740/prom.c
> @@ -25,7 +25,6 @@
>  
>  void __init prom_init(void)
>  {
> -	mips_machtype = MACH_INGENIC_JZ4740;
>  	fw_init_cmdline();
>  }
>  
> diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
> index 6d0152321819..afb40f8bce96 100644
> --- a/arch/mips/jz4740/setup.c
> +++ b/arch/mips/jz4740/setup.c
> @@ -53,6 +53,16 @@ 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)
> +{
> +	if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
> +		return MACH_INGENIC_JZ4780;
> +	if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
> +		return MACH_INGENIC_JZ4770;

Based on the assumption that fdt will always be non-NULL since commit
ffb1843d059c ("MIPS: JZ4740: require & include DT"):

Reviewed-by: James Hogan <jhogan@...nel.org>

Cheers
James

> +
> +	return MACH_INGENIC_JZ4740;
> +}
> +
>  void __init plat_mem_setup(void)
>  {
>  	int offset;
> @@ -63,6 +73,8 @@ void __init plat_mem_setup(void)
>  	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)
> @@ -75,10 +87,14 @@ void __init device_tree_init(void)
>  
>  const char *get_system_type(void)
>  {
> -	if (IS_ENABLED(CONFIG_MACH_JZ4780))
> +	switch (mips_machtype) {
> +	case MACH_INGENIC_JZ4780:
>  		return "JZ4780";
> -
> -	return "JZ4740";
> +	case MACH_INGENIC_JZ4770:
> +		return "JZ4770";
> +	default:
> +		return "JZ4740";
> +	}
>  }
>  
>  void __init arch_init_irq(void)
> -- 
> 2.11.0
> 

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