linux-kernel - Re: [PATCH 1/3] dt-bindings: spi: Provide bindings for fsl dspi working in slave mode

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Message-ID: <20180926163212.17646e43@jawa>
Date:   Wed, 26 Sep 2018 16:32:12 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Rob Herring <robh@...nel.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: spi: Provide bindings for fsl dspi
 working in slave mode

Hi Rob,

> On Tue, Sep 18, 2018 at 11:34:35AM +0200, Lukasz Majewski wrote:
> > This commit provides the description of new property:
> > "fsl,spi-slave-mode" which enables support for DSPI driver working
> > in slave mode.
> > 
> > As the new compatible shall be used with SPI bus equipped with
> > master device a new "spidev" based node has been introduced to
> > avoid confusion.
> > 
> > Signed-off-by: Lukasz Majewski <lukma@...x.de>
> > ---
> >  Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
> > b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt index
> > 18eeafe359d8..b30af19a2bc5 100644 ---
> > a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt +++
> > b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt @@ -26,6
> > +26,7 @@ Optional SPI properties for slave nodes:
> >  - fsl,spi-sck-cs-delay: a delay in nanoseconds between stopping
> > the clock signal and deactivating chip select, at the end of a
> > transfer.
> >  - bus-num : the slave chip chipselect signal number.
> > +- fsl,spi-slave-mode: if present, controller runs in slave mode.  
> 
> There's a standard property for this.

I've just realised that there is "spi-slave" property in the
Documentation/devicetree/bindings/spi/spi-bus.txt

I will convert the code to use it.

> 
> >  
> >  Example:
> >  
> > @@ -56,6 +57,13 @@ dspi0@...2c000 {
> >  		fsl,spi-cs-sck-delay = <100>;
> >  		fsl,spi-sck-cs-delay = <50>;
> >  	};
> > +
> > +	spidev3@1 {
> > +		compatible = "fsl,vf610-dspi";
> > +		spi-max-frequency = <30000000>;
> > +		reg = <1>;
> > +		fsl,spi-slave-mode;  
> 
> This doesn't look right for how slave mode is described.

You mean that I shall replace fsl,spi-slave-mode; with "spi-slave" ?

Or is there any other issue with this code?

Thanks for your review,

> 
> > +	};
> >  };
> >  
> >  
> > -- 
> > 2.11.0
> >   
> 




Best regards,

Lukasz Majewski

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