linux-kernel - Re: [PATCH v2 5/6] tty: serial: msm: Add RX DMA support

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Message-ID: <20150930133036.GJ10997@leverpostej>
Date:	Wed, 30 Sep 2015 14:30:36 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
Cc:	Andy Gross <agross@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	Frank Rowand <frank.rowand@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-soc@...r.kernel.org" <linux-soc@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v2 5/6] tty: serial: msm: Add RX DMA support

On Wed, Sep 30, 2015 at 01:08:25PM +0100, Ivan T. Ivanov wrote:
> Add receive DMA support for UARTDM type of controllers.
> 
> Tested on APQ8064, which have UARTDM v1.3 and ADM DMA engine
> and APQ8016, which have UARTDM v1.4 and BAM DMA engine.
> 
> Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
> ---
>  .../devicetree/bindings/serial/qcom,msm-uartdm.txt |   3 +
>  drivers/tty/serial/msm_serial.c                    | 232 ++++++++++++++++++++-
>  drivers/tty/serial/msm_serial.h                    |   4 +
>  3 files changed, 236 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt b/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
> index a600023d9ec1..182777fac9a2 100644
> --- a/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
> +++ b/Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
> @@ -29,6 +29,9 @@ Optional properties:
>  - qcom,tx-crci: Identificator <u32> for Client Rate Control Interface to be
>             used with TX DMA channel. Required when using DMA for transmission
>             with UARTDM v1.3 and bellow.
> +- qcom,rx-crci: Identificator <u32> for Client Rate Control Interface to be
> +           used with RX DMA channel. Required when using DMA for reception
> +           with UARTDM v1.3 and bellow.

My comments on qcom,tx-crci apply to qcom,rx-crci too.

This does not deel like it belongs in the UART binding and/or driver.

Mark.
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