linux-kernel - Re: [PATCH 4/5] dt-bindings: serial: sprd: Add dma properties to support DMA mode

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Date:   Fri, 1 Mar 2019 17:42:32 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>, jslaby@...e.com,
        Mark Rutland <mark.rutland@....com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Mark Brown <broonie@...nel.org>, lanqing.liu@...soc.com,
        linux-serial@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/5] dt-bindings: serial: sprd: Add dma properties to
 support DMA mode

On Fri, 1 Mar 2019 at 03:53, Rob Herring <robh@...nel.org> wrote:
>
> On Tue, Feb 19, 2019 at 03:31:14PM +0800, Baolin Wang wrote:
> > From: Lanqing Liu <lanqing.liu@...soc.com>
> >
> > This patch adds dmas and dma-names properties for the UART DMA mode.
> >
> > Signed-off-by: Lanqing Liu <lanqing.liu@...soc.com>
> > Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> > ---
> >  .../devicetree/bindings/serial/sprd-uart.txt       |    6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/serial/sprd-uart.txt b/Documentation/devicetree/bindings/serial/sprd-uart.txt
> > index 6eb5863..9ac28f6 100644
> > --- a/Documentation/devicetree/bindings/serial/sprd-uart.txt
> > +++ b/Documentation/devicetree/bindings/serial/sprd-uart.txt
> > @@ -15,12 +15,18 @@ Required properties:
> >    UART clock and source clock are optional properties, but enable clock
> >    is required.
> >
> > +Optional properties:
> > +- dma-names: Should contain "tx" for transmit and "rx" for receive channels.
>
> The order here doesn't match the example.

Ah, yes, will update new version to fix this. Thanks.

>
> > +- dmas: A list of dma specifiers, one for each entry in dma-names.
> > +
> >  Example:
> >       uart0: serial@0 {
> >               compatible = "sprd,sc9860-uart",
> >                            "sprd,sc9836-uart";
> >               reg = <0x0 0x100>;
> >               interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
> > +             dma-names = "rx", "tx";
> > +             dmas = <&ap_dma 19 19>, <&ap_dma 20 20>;
> >               clock-names = "enable", "uart", "source";
> >               clocks = <&clk_ap_apb_gates 9>, <&clk_uart0>, <&ext_26m>;
> >       };
> > --
> > 1.7.9.5
> >



-- 
Baolin Wang
Best Regards