Re: [PATCH v3 4/4] mfd: cros_ec: add RTC as mfd subdevice

[Lee Jones]

On Tue, 14 Feb 2017, Enric Balletbo i Serra wrote:

> From: Stephen Barber <smbarber@xxxxxxxxxxxx>
> 
> If the EC supports RTC host commands, expose an RTC device.
> 
> Signed-off-by: Stephen Barber <smbarber@xxxxxxxxxxxx>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> Acked-by: Benson Leung <bleung@xxxxxxxxxxxx>
> ---
> Changes since v2:
>  - Acked by Benson Leung
> Changes since v1:
>  - none
> 
>  drivers/platform/chrome/cros_ec_dev.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
> index 47268ec..ebe029d 100644
> --- a/drivers/platform/chrome/cros_ec_dev.c
> +++ b/drivers/platform/chrome/cros_ec_dev.c
> @@ -383,6 +383,24 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>  	kfree(msg);
>  }
>  
> +static const struct mfd_cell cros_ec_rtc_devs[] = {
> +	{
> +		.name = "cros-ec-rtc",
> +		.id   = -1,
> +	},
> +};
> +
> +static void cros_ec_rtc_register(struct cros_ec_dev *ec)
> +{
> +	int ret;
> +
> +	ret = mfd_add_devices(ec->dev, 0, cros_ec_rtc_devs,
> +			      ARRAY_SIZE(cros_ec_rtc_devs),
> +			      NULL, 0, NULL);
> +	if (ret)
> +		dev_err(ec->dev, "failed to add cros-ec-rtc device: %d\n", ret);
> +}

Holey poop!  Why are you using the MFD API outside of MFD?

Why can't you register this from the MFD driver?

>  static int ec_device_probe(struct platform_device *pdev)
>  {
>  	int retval = -ENOMEM;
> @@ -441,6 +459,10 @@ static int ec_device_probe(struct platform_device *pdev)
>  	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
>  		cros_ec_sensors_register(ec);
>  
> +	/* check whether this EC instance has RTC host command support */
> +	if (cros_ec_check_features(ec, EC_FEATURE_RTC))
> +		cros_ec_rtc_register(ec);
> +
>  	return 0;
>  
>  dev_reg_failed:

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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