linux-kernel - Re: [PATCH v2 2/3] ASoC: starfive: Add JH7110 PWM-DAC driver

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Message-ID: <b938ba84-38e9-b220-9686-6656e4452c10@linaro.org>
Date:   Mon, 31 Jul 2023 09:06:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hal Feng <hal.feng@...rfivetech.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Walker Chen <walker.chen@...rfivetech.com>,
        Xingyu Wu <xingyu.wu@...rfivetech.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] ASoC: starfive: Add JH7110 PWM-DAC driver

On 31/07/2023 05:28, Hal Feng wrote:
> Add PWM-DAC driver support for the StarFive JH7110 SoC.
> 


...

> +static int jh7110_pwmdac_probe(struct platform_device *pdev)
> +{
> +	struct jh7110_pwmdac_dev *dev;
> +	struct resource *res;
> +	int ret;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> +	if (IS_ERR(dev->base))
> +		return PTR_ERR(dev->base);
> +
> +	dev->mapbase = res->start;
> +
> +	dev->clks[0].id = "apb";
> +	dev->clks[1].id = "core";
> +
> +	ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(dev->clks), dev->clks);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to get pwmdac clocks\n");

return dev_err_probe

> +		return ret;
> +	}
> +
> +	dev->rst_apb = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> +	if (IS_ERR(dev->rst_apb)) {
> +		dev_err(&pdev->dev, "failed to get pwmdac apb reset\n");
> +		return PTR_ERR(dev->rst_apb);

return dev_err_probe

> +	}
> +
> +	dev->dev = &pdev->dev;
> +	dev->shift = PWMDAC_SHIFT_8;
> +	dev->duty_cycle = PWMDAC_CYCLE_CENTER;
> +	dev->cnt_n = PWMDAC_SAMPLE_CNT_1;
> +	dev->data_change = NO_CHANGE;
> +	dev->data_mode = INVERTER_DATA_MSB;
> +	dev->data_shift = PWMDAC_DATA_LEFT_SHIFT_BIT_0;
> +
> +	dev_set_drvdata(&pdev->dev, dev);
> +	ret = devm_snd_soc_register_component(&pdev->dev,
> +					      &jh7110_pwmdac_component,
> +					      &jh7110_pwmdac_dai, 1);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register dai\n");
> +		return ret;

I guess here as well for consistency and shorter code even though
EPROBE_DEFER does not happen really.

return dev_err_probe

> +	}
> +
> +	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register pcm\n");
> +		return ret;

return dev_err_probe

> +	}
> +

Best regards,
Krzysztof