linux-kernel - Re: [PATCH v2 3/3] sh: dma: Correct the number of DMA channels in SH7709

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Date:   Tue, 04 Jul 2023 22:35:13 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Artur Rojek <contact@...ur-rojek.eu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Rafael Ignacio Zurita <rafaelignacio.zurita@...il.com>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] sh: dma: Correct the number of DMA channels in
 SH7709

On Sat, 2023-05-27 at 18:44 +0200, Artur Rojek wrote:
> According to the hardware manual [1], the DMAC found in SH7709 features
> only 4 channels.
> 
> While at it, also sort the existing targets and clarify that
> NR_ONCHIP_DMA_CHANNELS must be a multiply of two.
> 
> [1] https://www.renesas.com/us/en/document/mah/sh7709s-group-hardware-manual (p. 373)
> 
> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
> ---
> 
> v2: - sort existing targets
>     - clarify that the value must be a multiply of two
> 
>  arch/sh/drivers/dma/Kconfig | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/sh/drivers/dma/Kconfig b/arch/sh/drivers/dma/Kconfig
> index 7d54f284ce10..382fbb189fcf 100644
> --- a/arch/sh/drivers/dma/Kconfig
> +++ b/arch/sh/drivers/dma/Kconfig
> @@ -28,17 +28,19 @@ config SH_DMA_API
>  config NR_ONCHIP_DMA_CHANNELS
>  	int
>  	depends on SH_DMA
> -	default "4" if CPU_SUBTYPE_SH7750  || CPU_SUBTYPE_SH7751  || \
> -		       CPU_SUBTYPE_SH7750S || CPU_SUBTYPE_SH7091
> +	default "4" if CPU_SUBTYPE_SH7709 || CPU_SUBTYPE_SH7750  || \
> +		       CPU_SUBTYPE_SH7750S || CPU_SUBTYPE_SH7751 || \
> +		       CPU_SUBTYPE_SH7091
>  	default "8" if CPU_SUBTYPE_SH7750R || CPU_SUBTYPE_SH7751R || \
>  		       CPU_SUBTYPE_SH7760
> -	default "12" if CPU_SUBTYPE_SH7723 || CPU_SUBTYPE_SH7780  || \
> -			CPU_SUBTYPE_SH7785 || CPU_SUBTYPE_SH7724
> +	default "12" if CPU_SUBTYPE_SH7723 || CPU_SUBTYPE_SH7724  || \
> +			CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785
>  	default "6"
>  	help
>  	  This allows you to specify the number of channels that the on-chip
> -	  DMAC supports. This will be 4 for SH7750/SH7751/Sh7750S/SH7091 and 8 for the
> -	  SH7750R/SH7751R/SH7760, 12 for the SH7723/SH7780/SH7785/SH7724, default is 6.
> +	  DMAC supports. This will be 4 for SH7709/SH7750/SH7750S/SH7751/SH7091,
> +	  8 for SH7750R/SH7751R/SH7760, and 12 for SH7723/SH7724/SH7780/SH7785.
> +	  Default is 6. Must be an even number.
>  
>  config SH_DMABRG
>  	bool "SH7760 DMABRG support"

Reviewed-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

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