linux-kernel - Re: [PATCH v4 2/2] ASoC: qcom: SC7280: Add machine driver

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Message-ID: <CAE-0n51zXLZiaB9aCdv=p_Wcxr5ZEdN-=b1hd5VATL6-CD0vRw@mail.gmail.com>
Date:   Fri, 29 Oct 2021 14:10:00 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Srinivasa Rao Mandadapu <srivasam@...eaurora.org>,
        agross@...nel.org, alsa-devel@...a-project.org,
        bgoswami@...eaurora.org, bjorn.andersson@...aro.org,
        broonie@...nel.org, devicetree@...r.kernel.org,
        judyhsiao@...omium.org, lgirdwood@...il.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        perex@...ex.cz, plai@...eaurora.org, robh+dt@...nel.org,
        rohitkr@...eaurora.org, srinivas.kandagatla@...aro.org,
        tiwai@...e.com
Subject: Re: [PATCH v4 2/2] ASoC: qcom: SC7280: Add machine driver

Quoting Srinivasa Rao Mandadapu (2021-10-29 08:04:36)
> diff --git a/sound/soc/qcom/Kconfig b/sound/soc/qcom/Kconfig
> index cc7c1de..d9ffcb7 100644
> --- a/sound/soc/qcom/Kconfig
> +++ b/sound/soc/qcom/Kconfig
> @@ -152,4 +152,16 @@ config SND_SOC_SC7180
>           SC7180 SoC-based systems.
>           Say Y if you want to use audio device on this SoCs.
>
> +config SND_SOC_SC7280
> +       tristate "SoC Machine driver for SC7280 boards"
> +       depends on I2C && SOUNDWIRE

Add || COMPILE_TEST so we can compile test this driver?

> +       select SND_SOC_QCOM_COMMON
> +       select SND_SOC_MAX98357A
> +       select SND_SOC_LPASS_RX_MACRO
> +       select SND_SOC_LPASS_TX_MACRO
> +       help
> +         To add support for audio on Qualcomm Technologies Inc.

Drop "To"?

> +         SC7280 SoC-based systems.
> +         Say Y if you want to use audio device on this SoCs.
> +
>  endif #SND_SOC_QCOM
> diff --git a/sound/soc/qcom/sc7280.c b/sound/soc/qcom/sc7280.c
> new file mode 100644
> index 0000000..1d73b4f
> --- /dev/null
> +++ b/sound/soc/qcom/sc7280.c
> @@ -0,0 +1,343 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
> +//
> +// sc7280.c -- ALSA SoC Machine driver for sc7280

Please remove filename from the comment as it's not useful and may
change.

> +
> +#include <linux/gpio.h>
[...]
> +
> +static void sc7280_snd_shutdown(struct snd_pcm_substream *substream)
> +{
> +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
> +       struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
> +
> +       switch (cpu_dai->id) {
> +       case LPASS_CDC_DMA_RX0:
> +       case LPASS_CDC_DMA_TX3:
> +       case LPASS_CDC_DMA_VA_TX0:
> +               break;
> +       case MI2S_SECONDARY:
> +               break;
> +       case LPASS_DP_RX:
> +               break;
> +       default:
> +               dev_err(rtd->dev, "%s: invalid dai id %d\n", __func__, cpu_dai->id);
> +               break;
> +       }

The function doesn't do anything though. Why do we care?

> +}
> +
> +static const struct snd_soc_ops sc7280_ops = {
> +       .startup = sc7280_snd_startup,
> +       .shutdown = sc7280_snd_shutdown,
> +       .hw_params = sc7280_snd_hw_params,
> +       .hw_free = sc7280_snd_hw_free,
> +       .prepare = sc7280_snd_prepare,
> +};
> +
> +static const struct snd_soc_dapm_widget sc7280_snd_widgets[] = {
> +       SND_SOC_DAPM_HP("Headphone Jack", NULL),
> +       SND_SOC_DAPM_MIC("Headset Mic", NULL),
> +};
> +
> +static int sc7280_snd_platform_probe(struct platform_device *pdev)
> +{
> +       struct snd_soc_card *card;
> +       struct sc7280_snd_data *data;
> +       struct device *dev = &pdev->dev;
> +       struct snd_soc_dai_link *link;
> +       int ret, i;
> +
> +       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> +       if (!data)
> +               return -ENOMEM;
> +
> +       card = &data->card;
> +       snd_soc_card_set_drvdata(card, data);
> +
> +       card->owner = THIS_MODULE;
> +       card->driver_name = "SC7280";
> +       card->dev = dev;
> +
> +       ret = qcom_snd_parse_of(card);
> +       if (ret)
> +               return ret;
> +
> +       for_each_card_prelinks(card, i, link) {
> +               link->init = sc7280_init;
> +               link->ops = &sc7280_ops;
> +       }
> +
> +       return devm_snd_soc_register_card(dev, card);
> +}
> +
> +static const struct of_device_id sc7280_snd_device_id[]  = {
> +       {.compatible = "google,sc7280-herobrine"},

Please add space after { and before }

> +       {}
> +};
> +MODULE_DEVICE_TABLE(of, sc7280_snd_device_id);