linux-kernel - Re: [PATCH v3] ARM: dts: Add support for Liebherr's BK4 device (vf610 based)

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Message-ID: <20181207102950.68796cf0@jawa>
Date:   Fri, 7 Dec 2018 10:29:50 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Stefan Agner <stefan@...er.ch>,
        Fabio Estevam <fabio.estevam@....com>
Subject: Re: [PATCH v3] ARM: dts: Add support for Liebherr's BK4 device
 (vf610 based)

Hi Fabio,

> Hi Lukasz,
> 
> On Thu, Dec 6, 2018 at 11:08 AM Lukasz Majewski <lukma@...x.de> wrote:
> 
> > I will check this latter this week...  
> 
> Reading the spi dt-binding it states that the spi slave node is
> optional.
> 
> If I remove it like this, then the warning is gone:

Unfortunately, the "slave" node is necessary - the "lwn,bk4" compatible
causes the spidev driver to be bound. 

Use space applications on this system use it to perform SPI
transmission.

IMHO, removing the node is not a solution - we shall discover why on
current next we do see such errors.

> 
> --- a/arch/arm/boot/dts/vf610-bk4.dts
> +++ b/arch/arm/boot/dts/vf610-bk4.dts
> @@ -109,12 +109,6 @@
>         bus-num = <3>;
>         status = "okay";
>         spi-slave;
> -
> -       slave@0 {
> -               compatible = "lwn,bk4";
> -               spi-max-frequency = <30000000>;
> -               reg = <0>;
> -       };
>  };
> 
>  &edma0 {
> 
> Does spi slave still work without it?


Best regards,

Lukasz Majewski

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