linux-kernel - Re: [PATCH v3 1/8] mfd / platform: cros_ec: use devm_mfd_add

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Date:   Mon, 3 Dec 2018 10:32:28 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     gwendal@...omium.org, drinkcat@...omium.org,
        linux-kernel@...r.kernel.org, groeck@...omium.org,
        kernel@...labora.com, bleung@...omium.org,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 1/8] mfd / platform: cros_ec: use devm_mfd_add_devices.

On Tue, 27 Nov 2018, Enric Balletbo i Serra wrote:

> Use devm_mfd_add_devices() for adding cros-ec core MFD child devices. This
> reduces the need of remove callback from platform/chrome for removing the
> MFD child devices.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
> Changes in v3:
> - Removed cros_ec_remove from include file.
> 
> Changes in v2:
> - Use devm only for the cros-ec core.
> 
>  drivers/mfd/cros_ec.c                 | 14 +++-----------
>  drivers/mfd/cros_ec_dev.c             |  1 +
>  drivers/platform/chrome/cros_ec_i2c.c | 10 ----------
>  drivers/platform/chrome/cros_ec_lpc.c |  4 ----
>  drivers/platform/chrome/cros_ec_spi.c | 11 -----------
>  include/linux/mfd/cros_ec.h           | 10 ----------
>  6 files changed, 4 insertions(+), 46 deletions(-)

Nice patch.

Just one question:

[...]

> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index 8f9d6964173e..ff788d3e6d5f 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -493,6 +493,7 @@ static int ec_device_remove(struct platform_device *pdev)
>  
>  	cros_ec_debugfs_remove(ec);
>  
> +	mfd_remove_devices(ec->dev);

Why is this still required?

>  	cdev_del(&ec->cdev);
>  	device_unregister(&ec->class_dev);
>  	return 0;

[...]

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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