linux-kernel - Re: [PATCH 1/3] mfd: add support for Allwinner SoCs ADC

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Message-ID: <20160628085154.GE4472@kwain>
Date:	Tue, 28 Jun 2016 10:51:54 +0200
From:	Antoine Tenart <antoine.tenart@...e-electrons.com>
To:	Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:	jdelvare@...e.com, linux@...ck-us.net, jic23@...nel.org,
	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	maxime.ripard@...e-electrons.com, wens@...e.org,
	lee.jones@...aro.org, linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	thomas.petazzoni@...e-electrons.com,
	antoine.tenart@...e-electrons.com
Subject: Re: [PATCH 1/3] mfd: add support for Allwinner SoCs ADC

Hello,

On Tue, Jun 28, 2016 at 10:18:15AM +0200, Quentin Schulz wrote:
> diff --git a/drivers/mfd/sunxi-gpadc-mfd.c b/drivers/mfd/sunxi-gpadc-mfd.c
> new file mode 100644
> index 0000000..710e297
> --- /dev/null
> +++ b/drivers/mfd/sunxi-gpadc-mfd.c
> @@ -0,0 +1,188 @@

[...]

> +	if (of_device_is_compatible(pdev->dev.of_node,
> +				    "allwinner,sun4i-a10-ts"))
> +		ret = mfd_add_devices(sunxi_gpadc_mfd_dev->dev, 0,
> +				      sun4i_gpadc_mfd_cells,
> +				      ARRAY_SIZE(sun4i_gpadc_mfd_cells), NULL,
> +				      0, NULL);
> +	else if (of_device_is_compatible(pdev->dev.of_node,
> +					 "allwinner,sun5i-a13-ts"))
> +		ret = mfd_add_devices(sunxi_gpadc_mfd_dev->dev, 0,
> +				      sun5i_gpadc_mfd_cells,
> +				      ARRAY_SIZE(sun5i_gpadc_mfd_cells), NULL,
> +				      0, NULL);
> +	else if (of_device_is_compatible(pdev->dev.of_node,
> +					 "allwinner,sun6i-a31-ts"))
> +		ret = mfd_add_devices(sunxi_gpadc_mfd_dev->dev, 0,
> +				      sun6i_gpadc_mfd_cells,
> +				      ARRAY_SIZE(sun6i_gpadc_mfd_cells), NULL,
> +				      0, NULL);
> +
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
> +		regmap_del_irq_chip(irq, sunxi_gpadc_mfd_dev->regmap_irqc);
> +		mfd_remove_devices(&pdev->dev);

You don't need to explicitly call mfd_remove_devices() when
mfd_add_devices() fails. See:
http://lxr.free-electrons.com/source/drivers/mfd/mfd-core.c#L298

> +		return ret;
> +	}

Thanks,

Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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