linux-kernel - Re: [PATCH v2 1/4] dt: spi: Add Renesas RZ/N1 binding documentation

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Message-ID: <20191001114305.GA27944@bogus>
Date:   Tue, 1 Oct 2019 06:43:05 -0500
From:   Rob Herring <robh@...nel.org>
To:     Gareth Williams <gareth.williams.jx@...esas.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Gareth Williams <gareth.williams.jx@...esas.com>
Subject: Re: [PATCH v2 1/4] dt: spi: Add Renesas RZ/N1 binding documentation

On Wed, 18 Sep 2019 09:04:33 +0100, Gareth Williams wrote:
> From: Phil Edworthy <phil.edworthy@...esas.com>
> 
> The Renesas RZ/N1 SPI Controller is based on the Synopsys DW SSI, but has
> additional registers for software CS control and DMA. This patch does not
> address the changes required for DMA support, it simply adds the compatible
> string. The CS functionality is not very useful and also not needed as
> Linux can use gpios for the CS signals.
> 
> Add a compatible string to handle any unforeseen issues that may arise, and
> pave the way for DMA support.
> 
> Signed-off-by: Gareth Williams <gareth.williams.jx@...esas.com>
> Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
> ---
> Note: All the other manufacturers detail their compatible strings in
> snps,dw-apb-ssi.txt. I think it makes sense for rzn1 to be in it's own file
> due to the changes made to the peripheral for DMA support.
> 
> v2:
>  - No changes.
> ---
>  Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt
> 

Reviewed-by: Rob Herring <robh@...nel.org>