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

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Date:   Wed, 26 Sep 2018 23:33:59 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Rob Herring <robh@...nel.org>, Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-spi <linux-spi@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: spi: Provide bindings for fsl dspi
 working in slave mode

Hi Geert,

> Hi Lukasz,
> 
> On Wed, Sep 26, 2018 at 4:33 PM Lukasz Majewski <lukma@...x.de> wrote:
> > > 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?  
> 
> According to Documentation/devicetree/bindings/spi/spi-bus.txt:
>   1. "spi-slave" should be a property of the controller node, not of
> the slave node,
>   2. the slave node should be called "slave", without unit address,
> and without "reg" property.

Thanks for clarification.

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 




Best regards,

Lukasz Majewski

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