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Message-ID:
<TYCPR01MB12093F6DB584A044473146B9AC2CA2@TYCPR01MB12093.jpnprd01.prod.outlook.com>
Date: Thu, 6 Mar 2025 13:41:01 +0000
From: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof
Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Magnus
Damm <magnus.damm@...il.com>, Biju Das <biju.das.jz@...renesas.com>,
"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>, Conor Dooley
<conor.dooley@...rochip.com>
Subject: RE: [PATCH v5 2/6] dt-bindings: dma: rz-dmac: Document RZ/V2H(P)
family of SoCs
Hi Geert,
Thanks for your feedback!
> From: Geert Uytterhoeven <geert@...ux-m68k.org>
> Sent: 06 March 2025 13:27
> Subject: Re: [PATCH v5 2/6] dt-bindings: dma: rz-dmac: Document RZ/V2H(P) family of SoCs
>
> Hi Fabrizio,
>
> On Wed, 5 Mar 2025 at 01:21, Fabrizio Castro
> <fabrizio.castro.jz@...esas.com> wrote:
> > Document the Renesas RZ/V2H(P) family of SoCs DMAC block.
> > The Renesas RZ/V2H(P) DMAC is very similar to the one found on the
> > Renesas RZ/G2L family of SoCs, but there are some differences:
> > * It only uses one register area
> > * It only uses one clock
> > * It only uses one reset
> > * Instead of using MID/IRD it uses REQ No
> > * It is connected to the Interrupt Control Unit (ICU)
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> > Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v4->v5:
> > * Removed ACK No from the specification of the dma cell.
> > * I have kept the tags received as this is a minor change and the
> > structure remains the same as v4. Please let me know if this is
> > not okay.
>
> Thanks for the update!
>
> > --- a/Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml
> > +++ b/Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml
> > @@ -61,14 +66,21 @@ properties:
> > '#dma-cells':
> > const: 1
> > description:
> > - The cell specifies the encoded MID/RID values of the DMAC port
>
> Please just insert "or the REQ No" and be done with it?
Will do.
>
> > - connected to the DMA client and the slave channel configuration
> > - parameters.
> > + For the RZ/A1H, RZ/Five, RZ/G2{L,LC,UL}, RZ/V2L, and RZ/G3S SoCs, the cell
> > + specifies the encoded MID/RID values of the DMAC port connected to the
> > + DMA client and the slave channel configuration parameters.
> > bits[0:9] - Specifies MID/RID value
> > bit[10] - Specifies DMA request high enable (HIEN)
> > bit[11] - Specifies DMA request detection type (LVL)
> > bits[12:14] - Specifies DMAACK output mode (AM)
> > bit[15] - Specifies Transfer Mode (TM)
> > + For the RZ/V2H(P) SoC the cell specifies the DMAC REQ No and the slave channel
> > + configuration parameters.
> > + bits[0:9] - Specifies the DMAC REQ No
> > + bit[10] - Specifies DMA request high enable (HIEN)
> > + bit[11] - Specifies DMA request detection type (LVL)
> > + bits[12:14] - Specifies DMAACK output mode (AM)
> > + bit[15] - Specifies Transfer Mode (TM)
>
> ... so the casual reader doesn't have to look for the (nonexisting)
> differences in the other bits.
Agreed.
>
> >
> > dma-channels:
> > const: 16
> > @@ -80,12 +92,29 @@ properties:
> > items:
> > - description: Reset for DMA ARESETN reset terminal
> > - description: Reset for DMA RST_ASYNC reset terminal
> > + minItems: 1
> >
> > reset-names:
> > items:
> > - const: arst
> > - const: rst_async
> >
> > + renesas,icu:
> > + description:
> > + On the RZ/V2H(P) SoC configures the ICU to which the DMAC is connected to.
>
> Are other SoCs with ICU planned?
Yes.
Also the DMACs on RZ/G3E are connected to the ICU in a similar fashion.
>
> > + It must contain the phandle to the ICU, and the index of the DMAC as seen
> > + from the ICU (e.g. parameter k from register ICU_DMkSELy).
>
> This is already described more formally below
>
> > + $ref: /schemas/types.yaml#/definitions/phandle-array
> > + items:
> > + - items:
> > + - description: phandle to the ICU node.
> > + - description: The DMAC index.
> > + 4 for DMAC0
> > + 0 for DMAC1
> > + 1 for DMAC2
> > + 2 for DMAC3
> > + 3 for DMAC4
>
> Other SoCs may have other mappings.
> So perhaps leave out the translation table, but write:
>
> The number of the DMAC as seen from the ICU, i.e. parameter k from
> register ICU_DMkSELy.
> This may differ from the actual DMAC instance number!
Good shout, I will adjust accordingly.
I'll wait for your feedback on the ICU driver patch and on the DMAC driver patch
before sending v6.
Thanks!
Cheers,
Fab
>
> > +
> > required:
> > - compatible
> > - reg
> > @@ -98,13 +127,25 @@ allOf:
> > - $ref: dma-controller.yaml#
> >
> > - if:
> > - not:
> > - properties:
> > - compatible:
> > - contains:
> > - enum:
> > - - renesas,r7s72100-dmac
> > + properties:
> > + compatible:
> > + contains:
> > + enum:
> > + - renesas,r9a07g043-dmac
> > + - renesas,r9a07g044-dmac
> > + - renesas,r9a07g054-dmac
> > + - renesas,r9a08g045-dmac
> > then:
> > + properties:
> > + reg:
> > + minItems: 2
> > + clocks:
> > + minItems: 2
> > + resets:
> > + minItems: 2
> > +
> > + renesas,icu: false
> > +
> > required:
> > - clocks
> > - clock-names
> > @@ -112,13 +153,42 @@ allOf:
> > - resets
> > - reset-names
> >
> > - else:
> > + - if:
> > + properties:
> > + compatible:
> > + contains:
> > + const: renesas,r7s72100-dmac
> > + then:
> > properties:
>
> reg:
> minItems: 2
>
> > clocks: false
> > clock-names: false
> > power-domains: false
> > resets: false
> > reset-names: false
> > + renesas,icu: false
> > +
> > + - if:
> > + properties:
> > + compatible:
> > + contains:
> > + const: renesas,r9a09g057-dmac
> > + then:
> > + properties:
> > + reg:
> > + maxItems: 1
> > + clocks:
> > + maxItems: 1
> > + resets:
> > + maxItems: 1
> > +
> > + clock-names: false
> > + reset-names: false
> > +
> > + required:
> > + - clocks
> > + - power-domains
> > + - renesas,icu
> > + - resets
> >
> > additionalProperties: false
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
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