linux-kernel - Re: [PATCH] ARM: configs: at91: unselect PIT

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Date:   Thu, 10 Oct 2019 13:50:43 +0200
From:   Alexander Dahl <ada@...rsis.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: configs: at91: unselect PIT

Am Mittwoch, 9. Oktober 2019, 21:48:14 CEST schrieb Alexandre Belloni:
> The PIT is not required anymore to successfully boot and may actually harm
> in case preempt-rt is used because the PIT interrupt is shared.
> Disable it so the TCB clocksource is used.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

Acked-by: Alexander Dahl <ada@...rsis.com>

> ---
>  arch/arm/configs/at91_dt_defconfig | 1 +
>  arch/arm/configs/sama5_defconfig   | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/arm/configs/at91_dt_defconfig
> b/arch/arm/configs/at91_dt_defconfig index 63d09e61b6dc..7e5ffdab47da
> 100644
> --- a/arch/arm/configs/at91_dt_defconfig
> +++ b/arch/arm/configs/at91_dt_defconfig
> @@ -18,6 +18,7 @@ CONFIG_ARCH_MULTI_V5=y
>  CONFIG_ARCH_AT91=y
>  CONFIG_SOC_AT91RM9200=y
>  CONFIG_SOC_AT91SAM9=y
> +# CONFIG_ATMEL_CLOCKSOURCE_PIT is not set
>  CONFIG_AEABI=y
>  CONFIG_UACCESS_WITH_MEMCPY=y
>  CONFIG_ZBOOT_ROM_TEXT=0x0
> diff --git a/arch/arm/configs/sama5_defconfig
> b/arch/arm/configs/sama5_defconfig index 7255709d46ea..ee7db6cedaa6 100644
> --- a/arch/arm/configs/sama5_defconfig
> +++ b/arch/arm/configs/sama5_defconfig
> @@ -20,6 +20,7 @@ CONFIG_ARCH_AT91=y
>  CONFIG_SOC_SAMA5D2=y
>  CONFIG_SOC_SAMA5D3=y
>  CONFIG_SOC_SAMA5D4=y
> +# CONFIG_ATMEL_CLOCKSOURCE_PIT is not set
>  CONFIG_AEABI=y
>  CONFIG_UACCESS_WITH_MEMCPY=y
>  CONFIG_ZBOOT_ROM_TEXT=0x0