linux-kernel - RE: [PATCH v5] Axi-usb: Add support for 64-bit addressing.

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Date:   Fri, 2 Sep 2016 06:02:14 +0000
From:   Nava kishore Manne <nava.manne@...inx.com>
To:     Soren Brinkmann <sorenb@...inx.com>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "pawel.moll@....com" <pawel.moll@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
        "galak@...eaurora.org" <galak@...eaurora.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH v5] Axi-usb: Add support for 64-bit addressing.

HI Soren,

        Thanks for the review....

> -----Original Message-----
> From: Sören Brinkmann [mailto:soren.brinkmann@...inx.com]
> Sent: Thursday, September 01, 2016 11:27 PM
> To: Nava kishore Manne <navam@...inx.com>
> Cc: robh+dt@...nel.org; pawel.moll@....com; mark.rutland@....com;
> ijc+devicetree@...lion.org.uk; galak@...eaurora.org; balbi@...nel.org;
> gregkh@...uxfoundation.org; devicetree@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; linux-
> usb@...r.kernel.org; Nava kishore Manne <navam@...inx.com>
> Subject: Re: [PATCH v5] Axi-usb: Add support for 64-bit addressing.
>
> On Thu, 2016-09-01 at 14:22:56 +0530, Nava kishore Manne wrote:
> > This patch updates the driver to support 64-bit DMA addressing.
> >
> > Signed-off-by: Nava kishore Manne <navam@...inx.com>
> > Acked-by: Rob Herring <robh@...nel.org>
> > ---
> > Changes for v5:
> >                 -None.
> >
> > Changes for v4:
> >                 -Used boolen property insted of addrwith property in the DT
> >                  as suggested by Arnd Bergmann.
> >                 -Adopt the DT relevant changes into the driver.
> >
> > Changes for v3:
> >                 -Added new compatable string for 5.00 IP version as suggested by
> >                  Arnd Bergmann.
> >                 -Used write_fn() insted of lo_hi_writeq() as suggested by
> >                  Arnd Bergmann.
> > Changes for v2:
> >                 -Added dma-ranges property in device tree as suggested by
> >                  Arnd Bergmann.
> >                 -Modified the driver code based on the xlnx,addrwidth.
> >
> >  .../devicetree/bindings/usb/udc-xilinx.txt         |  5 ++-
> >  drivers/usb/gadget/udc/udc-xilinx.c                | 52
> +++++++++++++++++++++-
> >  2 files changed, 54 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/udc-xilinx.txt
> > b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
> > index 47b4e39..d08d972 100644
> > --- a/Documentation/devicetree/bindings/usb/udc-xilinx.txt
> > +++ b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
> > @@ -1,12 +1,14 @@
> >  Xilinx USB2 device controller
> >
> >  Required properties:
> > -- compatible               : Should be "xlnx,usb2-device-4.00.a"
> > +- compatible               : Should be "xlnx,usb2-device-4.00.a" or
> > +                     "xlnx,usb2-device-5.00"
> >  - reg                      : Physical base address and size of the USB2
> >                       device registers map.
> >  - interrupts               : Should contain single irq line of USB2 device
> >                       controller
> >  - xlnx,has-builtin-dma     : if DMA is included
> > +- xlnx,has-64bit-dma       : if DMA is included 64-bit addressing support.
>
> We add these properties to describe the IP configuration + we have the
> version indicator in the compatible string. Do we really need both? It seems
> that all versions use the same driver and differentiation is made through the
> DT properties that describe the IP configuration parameters.
> Wouldn't it be better to just have one generic 'xlnx,axi-usb2' (or
> whatever) compatible string instead of patching the driver for each new
> version without really needing to differentiate the IP versions through it?
>
I think matching on the version number is slightly better, as we have the version
Already and it identifies the 64-bit  registers existence.

Regards,
Navakishore


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