Re: [PATCH v2 4/4] arm: dts: visconti: Add DT support for Toshiba Visconti5 ethernet controller

[Nobuhiro Iwamatsu]

Hi,

Thanks for your review.

On Fri, Feb 12, 2021 at 10:32:09AM +0100, Arnd Bergmann wrote:
> On Fri, Feb 12, 2021 at 4:03 AM Nobuhiro Iwamatsu
> <nobuhiro1.iwamatsu@xxxxxxxxxxxxx> wrote:
> > @@ -384,6 +398,16 @@ spi6: spi@28146000 {
> >                         #size-cells = <0>;
> >                         status = "disabled";
> >                 };
> > +
> > +               piether: ethernet@28000000 {
> > +                       compatible = "toshiba,visconti-dwmac";
> 
> Shouldn't there be a more specific compatible string here, as well as the
> particular version of the dwmac you use?

I rechecked the code again based on your point.
I need to specify the version of dwmac. I also noticed that it could
remove some unnecessary code. I will fix this.

> 
> In the binding example, you list the device as "dma-coherent",
> but in this instance, it is not marked that way. Can you find out
> whether the device is in fact connected properly to a cache-coherent
> bus?
> 
> Note that failing to mark it as cache-coherent will make the device
> rather slow and possibly not work correctly if it is in fact coherent,
> but the default is non-coherent since a lot of SoCs are lacking
> that hardware support.

Thanks for point out.
This hardware does not require dma-coherent. I will remove dma-coherent from DT
binding document.

> 
>        Arnd
> 

Best regards,
  Nobuhiro