On 2016-05-17 10:52:08 +0200, Geert Uytterhoeven wrote:
> On Wed, May 4, 2016 at 2:35 PM, Niklas Söderlund
> <niklas.soderlund+renesas@xxxxxxxxxxxx> wrote:
> > Add DMA properties to the I2C nodes.
> >
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> > ---
> > arch/arm64/boot/dts/renesas/r8a7795.dtsi | 14 ++++++++++++++
> > 1 file changed, 14 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/renesas/r8a7795.dtsi b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
> > index a7315eb..49896e4 100644
> > --- a/arch/arm64/boot/dts/renesas/r8a7795.dtsi
> > +++ b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
> > @@ -693,6 +693,8 @@
> > interrupts = <GIC_SPI 287 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 931>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x91>, <&dmac1 0x90>;
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <110>;
> > status = "disabled";
> > };
> > @@ -705,6 +707,8 @@
> > interrupts = <GIC_SPI 288 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 930>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x93>, <&dmac1 0x92>;
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <6>;
> > status = "disabled";
> > };
> > @@ -717,6 +721,8 @@
> > interrupts = <GIC_SPI 286 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 929>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x95>, <&dmac1 0x94>;
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <6>;
> > status = "disabled";
> > };
>
> The three above can be used with SYS-DMAC1 (channels 16-31) or with SYS-DMAC2
> (channels 32-47).
> It should be tested with the latter before adding the corresponding dmas, as
> we had issue with SYS-DMAC2 before (they may have been fixed in firmware in the
> mean time).
I tested with firmware v270-4core and you are correct, looks like dmac2
is not working for i2c.
>
> > @@ -729,6 +735,8 @@
> > interrupts = <GIC_SPI 290 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 928>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x97>, <&dmac1 0x96>;
>
> The two phandles above should reference "dmac0", as this i2c module can only be
> used with SYS-DMAC0 (channels 0-15), according to the datasheet.
Thanks for pointing this out! I will fix it.
>
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <110>;
> > status = "disabled";
> > };
> > @@ -741,6 +749,8 @@
> > interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 927>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x99>, <&dmac1 0x98>;
>
> dmac0
>
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <110>;
> > status = "disabled";
> > };
> > @@ -753,6 +763,8 @@
> > interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 919>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x9b>, <&dmac1 0x9a>;
>
> dmac0
>
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <110>;
> > status = "disabled";
> > };
> > @@ -765,6 +777,8 @@
> > interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&cpg CPG_MOD 918>;
> > power-domains = <&cpg>;
> > + dmas = <&dmac1 0x9d>, <&dmac1 0x9c>;
>
> dmac0
>
> > + dma-names = "tx", "rx";
> > i2c-scl-internal-delay-ns = <6>;
> > status = "disabled";
> > };
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> 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
--
Regards,
Niklas Söderlund
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