linux-kernel - Re: [PATCH 3/3] spi: dw: Add compatible string for Renesas RZ/N1 SPI Controller

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Date:   Sun, 15 Sep 2019 12:22:42 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Gareth Williams <gareth.williams.jx@...esas.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] spi: dw: Add compatible string for Renesas RZ/N1 SPI
 Controller

On Sun, Sep 15, 2019 at 02:00:33PM +0300, Andy Shevchenko wrote:
> On Fri, Sep 13, 2019 at 3:14 PM Gareth Williams

> > 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 registers are not needed as Linux can use gpios for the CS
> > signals.

> > +       { .compatible = "renesas,rzn1-spi", },

> Can't you simple use in DT something like
>   compatible = "renesas,rzn1-spi", "snps,dw-apb-ssi"
> ?

Yes, you can and should do that but it's still nice to list the
compatibles explicitly in the driver in case someone leaves out the
fallback compatible for whatever reason - if both the driver and the DT
list things then there's a bit more robustness.

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