Re: [PATCH v11 8/9] ARM: dts: r9a06g032: Add the two DMA nodes

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Hi Geert,

geert@xxxxxxxxxxxxxx wrote on Mon, 25 Apr 2022 18:29:58 +0200:

> Hi Miquel,
> 
> On Thu, Apr 21, 2022 at 10:51 AM Miquel Raynal
> <miquel.raynal@xxxxxxxxxxx> wrote:
> > Describe the two DMA controllers available on this SoC.
> >
> > Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>  
> 
> Still, a few comments below, valid for both instances...
> 
> > --- a/arch/arm/boot/dts/r9a06g032.dtsi
> > +++ b/arch/arm/boot/dts/r9a06g032.dtsi
> > @@ -200,6 +200,36 @@ nand_controller: nand-controller@40102000 {
> >                         status = "disabled";
> >                 };
> >
> > +               dma0: dma-controller@40104000 {
> > +                       compatible = "renesas,r9a06g032-dma", "renesas,rzn1-dma";
> > +                       reg = <0x40104000 0x1000>;
> > +                       interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
> > +                       clock-names = "hclk";
> > +                       clocks = <&sysctrl R9A06G032_HCLK_DMA0>;
> > +                       dma-channels = <8>;
> > +                       dma-requests = <16>;
> > +                       dma-masters = <1>;
> > +                       #dma-cells = <3>;
> > +                       block_size = <0xfff>;
> > +                       data_width = <3>;  
> 
> This property is deprecated, in favor of "dma-width".

Indeed,
	data_width = <3>;
is deprecated.

However, dma-width does not seem to be described anywhere. Do you mean:
	data-width = <8>;
instead?

> 
> > +                       status = "disabled";  
> 
> Why not keep it enabled?

I'm used to always disable all the nodes from the SoC descriptions,
but it's true that for a DMA controller it might make sense to keep
it enabled.

Would dropping the status property be enough or do you prefer a proper
	status = "okay";
instead?

Thanks a lot,
Miquèl




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