linux-kernel - Re: [PATCH 2/2] sh: dma: Correct the number of DMA channels in SH7709

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Message-ID: <c630350f51eb3bf85d2a7fb7c51b3f1ba3a57c4f.camel@physik.fu-berlin.de>
Date:   Sun, 07 May 2023 10:33:17 +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>
Cc:     Rafael Ignacio Zurita <rafaelignacio.zurita@...il.com>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] sh: dma: Correct the number of DMA channels in
 SH7709

On Sat, 2023-05-06 at 16:17 +0200, Artur Rojek wrote:
> According to the PM, the DMAC found in SH7709 features only 4 channels.
> 
> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
> ---
>  arch/sh/drivers/dma/Kconfig | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/sh/drivers/dma/Kconfig b/arch/sh/drivers/dma/Kconfig
> index 7d54f284ce10..4494d09597e9 100644
> --- a/arch/sh/drivers/dma/Kconfig
> +++ b/arch/sh/drivers/dma/Kconfig
> @@ -28,8 +28,9 @@ 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_SH7751 || CPU_SUBTYPE_SH7750S || \
> +		       CPU_SUBTYPE_SH7091
>  	default "8" if CPU_SUBTYPE_SH7750R || CPU_SUBTYPE_SH7751R || \
>  		       CPU_SUBTYPE_SH7760
>  	default "12" if CPU_SUBTYPE_SH7723 || CPU_SUBTYPE_SH7780  || \
> @@ -37,8 +38,9 @@ config NR_ONCHIP_DMA_CHANNELS
>  	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/SH7751/Sh7750S/SH7091
> +	  and 8 for the SH7750R/SH7751R/SH7760, 12 for the SH7723/SH7780/SH7785/SH7724,
> +	  default is 6.
>  
>  config SH_DMABRG
>  	bool "SH7760 DMABRG support"

I will replace "PM" with "processor manual" since the acronym is not necessarily
unambiguous, at least I didn't know at first what you were referring to. I checked
the manual [1] myself and four DMA channels is correct, thus:

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

Adrian

> [1] https://www.renesas.com/us/en/document/mah/sh7709s-group-hardware-manual?r=1055106 (S. 373)

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