Subject: [PATCH] mfd: max77686: Fix parent of rtc device

From: [email-masked] (Krzysztof Kozłowski)
Date: Tue, 02 Dec 2014 14:33:33 +0100

On 02.12.2014 13:45, Yadwinder Singh Brar wrote:
> rtc have different i2c client than power(pmic) block. So rtc device should
> sit under its own i2c client in device hierarchy, which reflects in sysfs also.
> This patch modifies code to register rtc cell with rtc->dev as parent.
> 
> Without this patch :
> # ls /sys/class/i2c-adapter/i2c-0/0-0009/
> driver         max77686-pmic  modalias       power          uevent
> max77686-clk   max77686-rtc   name           subsystem
> 
> After applying patch :
> # ls /sys/class/i2c-adapter/i2c-0/0-0006/
> driver/        modalias       power/         uevent
> max77686-rtc/  name           subsystem/
> 
> Signed-off-by: Yadwinder Singh Brar <[email-masked]>
> ---
> 
> Or Can we follow another (exhaustive but more cleaner) approach, which will
> be more like code refactoring and cleanup rather than only fix:
> Since rtc uses i2c client, which gets created using i2c_new_dummy() and is not
> shared by any other cell of max77686. So we can covert rtc platform driver
> itself to i2c client driver. It will also allow to expilicitly describe
> max77686-rtc in DT which we can't do now.
> It can be applicable to some other existing and new mfd pmic drivers.
> Any suggestion/comments ?

Hi,

What kind of problem is solved by this patch?

Best regards,
Krzysztof

> 
> ---
>  drivers/mfd/max77686.c |   22 ++++++++++++++++++++--
>  1 files changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c
> index 929795e..22c0948 100644
> --- a/drivers/mfd/max77686.c
> +++ b/drivers/mfd/max77686.c
> @@ -39,10 +39,13 @@
>  
>  static const struct mfd_cell max77686_devs[] = {
>  	{ .name = "max77686-pmic", },
> -	{ .name = "max77686-rtc", },
>  	{ .name = "max77686-clk", },
>  };
>  
> +static const struct mfd_cell max77686_rtc_dev[] = {
> +	{ .name = "max77686-rtc", },
> +};
> +
>  static const struct mfd_cell max77802_devs[] = {
>  	{ .name = "max77802-pmic", },
>  	{ .name = "max77802-clk", },
> @@ -332,14 +335,27 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
>  		goto err_del_irqc;
>  	}
>  
> +	if (max77686->type == TYPE_MAX77686) {
> +		ret = mfd_add_devices(&max77686->rtc->dev, -1, max77686_rtc_dev,
> +			1, NULL, 0, NULL);
> +		if (ret < 0) {
> +			dev_err(&max77686->rtc->dev,
> +				"failed to add RTC device %d\n", ret);
> +			goto err_del_rtc_irqc;
> +		}
> +	}
> +
>  	ret = mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, 0, NULL);
>  	if (ret < 0) {
>  		dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
> -		goto err_del_rtc_irqc;
> +		goto err_del_rtc_dev;
>  	}
>  
>  	return 0;
>  
> +err_del_rtc_dev:
> +	if (max77686->type == TYPE_MAX77686)
> +		mfd_remove_devices(&max77686->rtc->dev);
>  err_del_rtc_irqc:
>  	regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data);
>  err_del_irqc:
> @@ -356,6 +372,8 @@ static int max77686_i2c_remove(struct i2c_client *i2c)
>  	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
>  
>  	mfd_remove_devices(max77686->dev);
> +	if (max77686->type == TYPE_MAX77686)
> +		mfd_remove_devices(&max77686->rtc->dev);
>  
>  	regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data);
>  	regmap_del_irq_chip(max77686->irq, max77686->irq_data);
>