Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <2e369015776577c6c32ec2f7d05e35f796edf713.camel@pengutronix.de>
Subject: Re: [PATCH 1/2] ASoC: sunxi: Add Allwinner H6 Digital MIC driver
From:   Philipp Zabel <p.zabel@pengutronix.de>
To:     Ban Tao <fengzheng923@gmail.com>, lgirdwood@gmail.com,
        broonie@kernel.org, perex@perex.cz, tiwai@suse.com,
        mripard@kernel.org, wens@csie.org, jernej.skrabec@gmail.com,
        samuel@sholland.org, krzk@kernel.org
Cc:     linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org,
        linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev
Date:   Tue, 15 Jun 2021 15:18:05 +0200
In-Reply-To: <20210615130326.2044-1-fengzheng923@gmail.com>
References: <20210615130326.2044-1-fengzheng923@gmail.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8BIT
User-Agent: Evolution 3.30.5-1.1 
MIME-Version: 1.0
Precedence: bulk

Hi Ban,

On Tue, 2021-06-15 at 21:03 +0800, Ban Tao wrote:
> The Allwinner H6 and later SoCs have an DMIC block
> which is capable of capture.
> 
> Signed-off-by: Ban Tao <fengzheng923@gmail.com>
[...]
> diff --git a/sound/soc/sunxi/sun50i-dmic.c b/sound/soc/sunxi/sun50i-dmic.c
> new file mode 100644
> index 000000000000..78d512d93974
> --- /dev/null
> +++ b/sound/soc/sunxi/sun50i-dmic.c
> @@ -0,0 +1,408 @@
[...]
> +	host->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
> +	if (IS_ERR(host->rst) && PTR_ERR(host->rst) == -EPROBE_DEFER) {
> +		ret = -EPROBE_DEFER;
> +		dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
> +		return ret;
> +	}

Please don't ignore errors. For example:

	if (IS_ERR(host->rst))
		return dev_err_probe(&pdev->dev, PTR_ERR(host->rst),
				     "Failed to  get reset\n");

devm_reset_control_get_optional_exclusive() will return NULL if no reset
is specified in the device tree.

> +	if (!IS_ERR(host->rst))
> +		reset_control_deassert(host->rst);

Then this is not necessary. Just use:

	reset_control_deassert(host->rst);

regards
Philipp