From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Mon, 17 Feb 2014 10:37:06 +0000 Subject: [PATCH v6 2/3] serial: fsl_lpuart: add DMA support In-Reply-To: <1392614888-10261-3-git-send-email-yao.yuan@freescale.com> References: <1392614888-10261-1-git-send-email-yao.yuan@freescale.com> <1392614888-10261-3-git-send-email-yao.yuan@freescale.com> Message-ID: <20140217103706.GA18920@e106331-lin.cambridge.arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Feb 17, 2014 at 05:28:07AM +0000, Yuan Yao wrote: > Add dma support for lpuart. This function depend on DMA driver. > You can turn on it by write both the dmas and dma-name properties in dts node. > > Signed-off-by: Yuan Yao > Acked-by: Arnd Bergmann > --- > .../devicetree/bindings/serial/fsl-lpuart.txt | 19 +- > drivers/tty/serial/fsl_lpuart.c | 430 ++++++++++++++++++++- > 2 files changed, 433 insertions(+), 16 deletions(-) > > diff --git a/Documentation/devicetree/bindings/serial/fsl-lpuart.txt b/Documentation/devicetree/bindings/serial/fsl-lpuart.txt > index 6fd1dd1..6e1cbbf 100644 > --- a/Documentation/devicetree/bindings/serial/fsl-lpuart.txt > +++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.txt > @@ -5,10 +5,19 @@ Reqiuired properties: > - reg : Address and length of the register set for the device > - interrupts : Should contain uart interrupt > > +Optional properties: > +- dmas: A list of two dma specifiers, one for each entry in dma-names. > +- dma-names: should contain "tx" and "rx". > + > +Note: Optional properties for DMA support. Write them both or both not. > + > Example: > > uart0: serial at 40027000 { > - compatible = "fsl,vf610-lpuart"; > - reg = <0x40027000 0x1000>; > - interrupts = <0 61 0x00>; > - }; > + compatible = "fsl,vf610-lpuart"; > + reg = <0x40027000 0x1000>; > + interrupts = <0 61 0x00>; > + dmas = <&edma0 0 2>, > + <&edma0 0 3>; > + dma-names = "rx","tx"; > + }; For the binding: Acked-by: Mark Rutland Mark.