linux-kernel - Re: [PATCH 1/2] ASoC: sunxi: Add Allwinner H6 Digital MIC driver

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Message-ID: <CAE=m61-kHPeKNvEEc08w8DeUwssGPWNf5UaYojRPNZRJ0v=arw@mail.gmail.com>
Date:   Thu, 17 Jun 2021 15:42:43 +0800
From:   班涛 <fengzheng923@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        mripard@...nel.org, wens@...e.org, jernej.skrabec@...il.com,
        p.zabel@...gutronix.de, Samuel Holland <samuel@...lland.org>,
        krzk@...nel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/2] ASoC: sunxi: Add Allwinner H6 Digital MIC driver

Hi,

Mark Brown <broonie@...nel.org> 于2021年6月15日周二 下午9:22写道：
>
> On Tue, Jun 15, 2021 at 09:03:26PM +0800, Ban Tao wrote:
>
> Other than a few small things this looks good:
>
> > +M:   Ban Tao <fengzheng923@...il.com>
> > +L:   alsa-devel@...a-project.org (moderated for non-subscribers)
> > +S:   Maintained
> > +F:   Documentation/devicetree/bindings/sound/allwinner,sun50i-h6-dmic.yaml
> > +F:   sound/soc/sunxi/sun50i-dmic.c
>
> Not the binding document?
>
> > @@ -0,0 +1,408 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * ALSA SoC DMIC Audio Layer
> > + *
> > + * Copyright 2021 Ban Tao <fengzheng923@...il.com>
> > + *
>
> Please make the entire comment a C++ one so things look more
> intentional.
>
For example;
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * This driver supports the DMIC in Allwinner's H6 SoCs.
 *
 * Copyright 2021 Ban Tao <fengzheng923@...il.com>
 *
 */
is this OK?


> > +static void sun50i_snd_rxctrl_enable(struct snd_pcm_substream *substream,
> > +                                 struct sun50i_dmic_dev *host, bool enable)
> > +{
> > +     if (enable) {
>
> > +     } else {
>
> > +static int sun50i_dmic_trigger(struct snd_pcm_substream *substream, int cmd,
> > +                            struct snd_soc_dai *dai)
> > +{
> > +     int ret = 0;
> > +     struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(dai);
> > +
> > +     if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
> > +             return -EINVAL;
> > +
> > +     switch (cmd) {
> > +     case SNDRV_PCM_TRIGGER_START:
> > +     case SNDRV_PCM_TRIGGER_RESUME:
> > +     case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> > +             sun50i_snd_rxctrl_enable(substream, host, true);
> > +             break;
> > +
> > +     case SNDRV_PCM_TRIGGER_STOP:
> > +     case SNDRV_PCM_TRIGGER_SUSPEND:
> > +     case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> > +             sun50i_snd_rxctrl_enable(substream, host, false);
> > +             break;
>
> This is the only caller of _rxctrl_enable() and _rxctrl_enable() shares
> no code between the two cases - just inline _rxctrl_enable() here, it's
> clearer what's going on.
>
> > +     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +     base = devm_ioremap_resource(&pdev->dev, res);
>
> devm_platform_ioremap_resource()

But I need to get the register base address of DMIC. E.g res->start.
host->dma_params_rx.addr = res->start + SUN50I_DMIC_DATA;