linux-kernel - Re: [PATCH] ARM: exynos: add machine description for ODROID-XU3/4

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Message-ID: <9f1311f1-2986-21f1-7016-29efc7b2a543@math.uni-bielefeld.de>
Date:   Sun, 19 Nov 2017 18:21:16 +0100
From:   Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
To:     Dongjin Kim <tobetter@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: exynos: add machine description for ODROID-XU3/4

I don't think this approach scales at all. DietPi can just read the devicetree
through sysfs and retrieve the compatible and/or model of the base node.

- Tobias

Dongjin Kim wrote:
> This patch is to add the machine descriptions for ODROID-XU3/4 boards
> in order to present the hardware name at /proc/cputinfo rather than
> "SAMSUNG EXYNOS (Flattened Device Tree)". An embedded open source project,
> such as DietPi, reads the hardware name to run different features.
> 
> 	$ cat /proc/cpuinfo | grep Hardware
> 	Hardware        : ODROID-XU4
> 
> Signed-off-by: Dongjin Kim <tobetter@...il.com>
> ---
>  arch/arm/mach-exynos/exynos.c | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
> index c404c15ad07f..6197dbf9f48b 100644
> --- a/arch/arm/mach-exynos/exynos.c
> +++ b/arch/arm/mach-exynos/exynos.c
> @@ -241,3 +241,31 @@ DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
>  	.dt_compat	= exynos_dt_compat,
>  	.dt_fixup	= exynos_dt_fixup,
>  MACHINE_END
> +
> +#define ODROID_MACHINE_START(name, compat)			\
> +	DT_MACHINE_START(EXYNOS5422_ODROID_##name, "ODROID-"#name)	\
> +		.l2c_aux_val	= 0x3c400001,			\
> +		.l2c_aux_mask	= 0xc20fffff,			\
> +		.smp		= smp_ops(exynos_smp_ops),	\
> +		.map_io		= exynos_init_io,		\
> +		.init_early	= exynos_firmware_init,		\
> +		.init_irq	= exynos_init_irq,		\
> +		.init_machine	= exynos_dt_machine_init,	\
> +		.init_late	= exynos_init_late,		\
> +		.dt_compat	= compat,			\
> +		.dt_fixup	= exynos_dt_fixup,		\
> +	MACHINE_END
> +
> +static char const *const exynos5422_odroidxu3_dt_compat[] __initconst = {
> +	"hardkernel,odroid-xu3",
> +	"hardkernel,odroid-xu3-lite",
> +	NULL,
> +};
> +
> +static char const *const exynos5422_odroidxu4_dt_compat[] __initconst = {
> +	"hardkernel,odroid-xu4",
> +	NULL,
> +};
> +
> +ODROID_MACHINE_START(XU3, exynos5422_odroidxu3_dt_compat)
> +ODROID_MACHINE_START(XU4, exynos5422_odroidxu4_dt_compat)
>