linux-kernel - Re: [PATCH v2 1/2] dmaengine: Introduce DW AXI DMAC driver

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Date:   Mon, 5 Mar 2018 15:56:37 +0000
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>
CC:     "vinod.koul@...el.com" <vinod.koul@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "Alexey.Brodkin@...opsys.com" <Alexey.Brodkin@...opsys.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "wan.ahmad.zainie.wan.mohamad@...el.com" 
        <wan.ahmad.zainie.wan.mohamad@...el.com>
Subject: Re: [PATCH v2 1/2] dmaengine: Introduce DW AXI DMAC driver

On Mon, 2018-02-26 at 18:42 +0200, Andy Shevchenko wrote:
> On Mon, Feb 26, 2018 at 4:56 PM, Eugeniy Paltsev
> <Eugeniy.Paltsev@...opsys.com> wrote:
> 
> > +       chip->core_clk = devm_clk_get(chip->dev, "core-clk");
> 
> Does the name come from datasheet?
> 
> > +       chip->cfgr_clk = devm_clk_get(chip->dev, "cfgr-clk");
> 
> Ditto?

Yes, these names came from datasheet.

> > +       }
> > +       /* Enable clk before accessing to registers */
> > +       clk_prepare_enable(chip->cfgr_clk);
> > +       clk_prepare_enable(chip->core_clk);
> 
> Each of them may fail. Is it okay?

As it is driver remove callback I guess it is okay.

> > +static const struct dev_pm_ops dw_axi_dma_pm_ops = {
> > +       SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
> > +};
> 
> No system suspend?

Are you talking about SET_SYSTEM_SLEEP_PM_OPS?
I don't implement these OPS as we don't have any platform which has DW AXI DMAC
and supports sleeping - so I can't test them.

-- 
 Eugeniy Paltsev