linux-kernel - Re: [PATCH 3/8 v2] dma: k3dma: Upgrade k3dma driver to support hisi_asp

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Message-ID: <CALAqxLUAA95PBiSGrVNWkJT8r4GQQDRU9Q1LE=uFQLsDEeLZwA@mail.gmail.com>
Date:   Fri, 4 Jan 2019 21:22:46 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Youlin Wang <wwx575822@...esmail.huawei.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Zhuangluan Su <suzhuangluan@...ilicon.com>,
        Ryan Grachek <ryan@...ted.us>, dmaengine@...r.kernel.org,
        Tanglei Han <hantanglei@...wei.com>
Subject: Re: [PATCH 3/8 v2] dma: k3dma: Upgrade k3dma driver to support
 hisi_asp_dma hardware

On Fri, Jan 4, 2019 at 7:42 PM Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
> On Fri, Jan 04, 2019 at 12:56:23PM -0800, John Stultz wrote:
> > From: Youlin Wang <wwx575822@...esmail.huawei.com>
> >
> > There is an new "hisi-pcm-asp-dma-1.0" device added in
> > "arch/arm64/boot/dts/hisilicon/hi3660.dtsi".
> > So we have to add a matching id in the driver file:
> >  .compatible = "hisilicon,hisi-pcm-asp-dma-1.0"
> >
> > And also hisi-pcm-asp dma device needs no setting to the clock.
> > So we skip this by adding and using soc data flags.
> >
> > After above this driver will support both k3 and hisi_asp dma hardware.
> >
>
> Small description about the hardware (ASP DMAC) would be really helpful.

I've taken a shot at this (along with integrating your other feedback
- thanks again for the review!), though as I don't have direct
documentation, my knowledge is a bit second hand.

See here:
https://git.linaro.org/people/john.stultz/android-dev.git/commit/?h=dev/hikey960-mainline-WIP&id=754a79facf1af0b59a7f8fd63050da12ebf5521e

Let me know if you have suggestions for more specific changes!
thanks
-john