linux-kernel - Re: [PATCH v2] sh: hd64461: fix virq offsets

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Date:   Thu, 13 Jul 2023 08:56:22 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Artur Rojek <contact@...ur-rojek.eu>,
        Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@....ru>
Cc:     linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sh: hd64461: fix virq offsets

On Tue, 2023-07-11 at 01:31 +0200, Artur Rojek wrote:
> A recent change to start counting SuperH IRQ #s from 16 breaks support
> for the Hitachi HD64461 companion chip.
> 
> Move the offchip IRQ base and HD64461 IRQ # by 16 in order to
> accommodate for the new virq numbering rules.
> 
> Fixes: a8ac2961148e ("sh: Avoid using IRQ0 on SH3 and SH4")
> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
> ---
> 
> v2: Make the IRQ base offset an explicit (64 + 16), as per review.
> 
>  arch/sh/cchips/Kconfig        | 4 ++--
>  arch/sh/include/asm/hd64461.h | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/sh/cchips/Kconfig b/arch/sh/cchips/Kconfig
> index efde2edb5627..9659a0bc58de 100644
> --- a/arch/sh/cchips/Kconfig
> +++ b/arch/sh/cchips/Kconfig
> @@ -29,9 +29,9 @@ endchoice
>  config HD64461_IRQ
>  	int "HD64461 IRQ"
>  	depends on HD64461
> -	default "36"
> +	default "52"
>  	help
> -	  The default setting of the HD64461 IRQ is 36.
> +	  The default setting of the HD64461 IRQ is 52.
>  
>  	  Do not change this unless you know what you are doing.
>  
> diff --git a/arch/sh/include/asm/hd64461.h b/arch/sh/include/asm/hd64461.h
> index afb24cb034b1..d2c485fa333b 100644
> --- a/arch/sh/include/asm/hd64461.h
> +++ b/arch/sh/include/asm/hd64461.h
> @@ -229,7 +229,7 @@
>  #define	HD64461_NIMR		HD64461_IO_OFFSET(0x5002)
>  
>  #define	HD64461_IRQBASE		OFFCHIP_IRQ_BASE
> -#define	OFFCHIP_IRQ_BASE	64
> +#define	OFFCHIP_IRQ_BASE	(64 + 16)
>  #define	HD64461_IRQ_NUM		16
>  
>  #define	HD64461_IRQ_UART	(HD64461_IRQBASE+5)

Applied to my for-linus branch.

Thanks,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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