linux-kernel - Re: [PATCH v4 04/12] ARM: Add basic support for Airoha EN7523 SoC

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Message-ID: <f5c80024-1457-58fc-6c4a-1ef5f60cce8f@arm.com>
Date:   Thu, 25 Nov 2021 13:21:33 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Felix Fietkau <nbd@....name>, linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>
Cc:     john@...ozen.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 04/12] ARM: Add basic support for Airoha EN7523 SoC

On 2021-11-25 11:07, Felix Fietkau wrote:
> From: John Crispin <john@...ozen.org>
> 
> EN7523 is an armv8 based silicon used inside broadband access type devices
> such as xPON and xDSL. It shares various silicon blocks with MediaTek
> silicon such as the MT7622.
> 
> Signed-off-by: John Crispin <john@...ozen.org>
> Signed-off-by: Bert Vermeulen <bert@...t.com>
> ---
>   arch/arm/Kconfig | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index f0f9e8bec83a..8468361a8721 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -573,6 +573,20 @@ config ARCH_VIRT
>   	select HAVE_ARM_ARCH_TIMER
>   	select ARCH_SUPPORTS_BIG_ENDIAN
>   
> +config ARCH_AIROHA
> +	bool "Airoha SoC Support"
> +	depends on ARCH_MULTI_V7
> +	select ARM_AMBA
> +	select ARM_GIC
> +	select ARM_GIC_V3
> +	select ARM_DMA_USE_IOMMU

Is this really needed? TBH I'd be rather surprised to see IOMMUs in a 
small-scale embedded router SoC, or are there others in a similar vein 
to MT7623N with random multimedia bits thrown in as well?

> +	select ARM_PSCI
> +	select HAVE_ARM_ARCH_TIMER
> +	select IOMMU_DMA

This does nothing (except bloat your image with some dead code which 
won't be called).

Robin.

> +	select COMMON_CLK
> +	help
> +	  Support for Airoha EN7523 SoCs
> +
>   #
>   # This is sorted alphabetically by mach-* pathname.  However, plat-*
>   # Kconfigs may be included either alphabetically (according to the
>