linux-kernel - Re: [PATCH v2 1/2] ARM: nspire: Use syscon-reboot to handle restart

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Date:   Wed, 26 Oct 2022 20:35:52 +0200
From:   Fabian Vogt <fabian@...ter-vogt.de>
To:     Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Daniel Tang <dt.tangr@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Davis <afd@...com>
Subject: Re: [PATCH v2 1/2] ARM: nspire: Use syscon-reboot to handle restart

Hi,

Am Mittwoch, 26. Oktober 2022, 18:13:01 CEST schrieb Andrew Davis:
> Writing this bit can be handled by the syscon-reboot driver. Add the
> info to DT and remove the machine_desc version.
> 
> Signed-off-by: Andrew Davis <afd@...com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

finally got this to run on real HW after reverting to an older .config
and refreshing options. Rebooting works fine here. Thanks a lot!

Tested-by: Fabian Vogt <fabian@...ter-vogt.de>
Reviewed-by: Fabian Vogt <fabian@...ter-vogt.de>

> ---
>  arch/arm/boot/dts/nspire.dtsi |  7 +++++++
>  arch/arm/mach-nspire/Kconfig  |  2 ++
>  arch/arm/mach-nspire/mmio.h   |  3 ---
>  arch/arm/mach-nspire/nspire.c | 10 ----------
>  4 files changed, 9 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/nspire.dtsi b/arch/arm/boot/dts/nspire.dtsi
> index bb240e6a3a6f..6357b803521e 100644
> --- a/arch/arm/boot/dts/nspire.dtsi
> +++ b/arch/arm/boot/dts/nspire.dtsi
> @@ -172,7 +172,14 @@ rtc: rtc@...90000 {
>  			};
>  
>  			misc: misc@...a0000 {
> +				compatible = "syscon", "simple-mfd";
>  				reg = <0x900a0000 0x1000>;
> +
> +				reboot {
> +					compatible = "syscon-reboot";
> +					offset = <0x08>;
> +					value = <0x02>;
> +				};
>  			};
>  
>  			pwr: pwr@...b0000 {
> diff --git a/arch/arm/mach-nspire/Kconfig b/arch/arm/mach-nspire/Kconfig
> index b7a3871876d7..0ffdcaca1e6b 100644
> --- a/arch/arm/mach-nspire/Kconfig
> +++ b/arch/arm/mach-nspire/Kconfig
> @@ -9,5 +9,7 @@ config ARCH_NSPIRE
>  	select ARM_VIC
>  	select ARM_TIMER_SP804
>  	select NSPIRE_TIMER
> +	select POWER_RESET
> +	select POWER_RESET_SYSCON
>  	help
>  	  This enables support for systems using the TI-NSPIRE CPU
> diff --git a/arch/arm/mach-nspire/mmio.h b/arch/arm/mach-nspire/mmio.h
> index 48e32f13f311..2ce0656139ec 100644
> --- a/arch/arm/mach-nspire/mmio.h
> +++ b/arch/arm/mach-nspire/mmio.h
> @@ -5,9 +5,6 @@
>   *	Copyright (C) 2013 Daniel Tang <tangrs@...grs.id.au>
>   */
>  
> -#define NSPIRE_MISC_PHYS_BASE		0x900A0000
> -#define NSPIRE_MISC_HWRESET		0x08
> -
>  #define NSPIRE_PWR_PHYS_BASE		0x900B0000
>  #define NSPIRE_PWR_VIRT_BASE		0xFEEB0000
>  #define NSPIRE_PWR_BUS_DISABLE1		0x18
> diff --git a/arch/arm/mach-nspire/nspire.c b/arch/arm/mach-nspire/nspire.c
> index 2d4abb0288b9..1e13337972dd 100644
> --- a/arch/arm/mach-nspire/nspire.c
> +++ b/arch/arm/mach-nspire/nspire.c
> @@ -27,16 +27,6 @@ static const char *const nspire_dt_match[] __initconst = {
>  	NULL,
>  };
>  
> -static void nspire_restart(enum reboot_mode mode, const char *cmd)
> -{
> -	void __iomem *base = ioremap(NSPIRE_MISC_PHYS_BASE, SZ_4K);
> -	if (!base)
> -		return;
> -
> -	writel(2, base + NSPIRE_MISC_HWRESET);
> -}
> -
>  DT_MACHINE_START(NSPIRE, "TI-NSPIRE")
>  	.dt_compat	= nspire_dt_match,
> -	.restart	= nspire_restart,
>  MACHINE_END