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SubjectRe: [PATCH v3] ARM: dts: Add support for Liebherr's BK4 device (vf610 based)
On Wed, 5 Dec 2018 21:12:46 -0200
Fabio Estevam <festevam@gmail.com> wrote:

> Hi Lukasz/Rob,
>
> On Tue, Oct 9, 2018 at 7:50 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> > +&dspi3 {
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_dspi3>;
> > + bus-num = <3>;
> > + status = "okay";
> > + spi-slave;
> > +
> > + slave@0 {
> > + compatible = "lwn,bk4";
> > + spi-max-frequency = <30000000>;
> > + reg = <0>;
> > + };
> > +};
>
> This is causing the following dtc warning in linux-next:
>
> DTC arch/arm/boot/dts/vf610-bk4.dtb
> arch/arm/boot/dts/vfxxx.dtsi:550.24-563.6: Warning (spi_bus_bridge):
> /soc/aips-bus@40080000/spi@400ad000: incorrect #address-cells for SPI
> bus
> also defined at arch/arm/boot/dts/vf610-bk4.dts:106.8-118.3
> arch/arm/boot/dts/vf610-bk4.dtb: Warning (spi_bus_reg): Failed
> prerequisite 'spi_bus_bridge'
>
> If spi-slave property is removed the warning is gone.

The spi-slave has been added according to review suggestion:
https://lkml.org/lkml/2018/9/26/836

That is the way to handle "slave" SPI operation mode across the kernel.

At the time of development - I've checked my NXP related patches with
W=1 passed to make. No warnings observed then.

>
> Looking at drivers/spi/spi-fsl-dspi.c I don't see the "spi-slave"
> property being handled there.
>
> Any ideas on how to fix this?

The *.dts file for Vybrid was sent and work on in parallel with the SPI
slave code implementation for Vybrid:

https://patchwork.kernel.org/patch/10680431/

Unfortunately, for the above patch I did not received any feedback
since mid September.

>
> Thanks




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
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