linux-kernel - Re: [PATCH 3/3] mfd: cros_ec_dev: Register cros

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Date:   Tue, 23 Jan 2018 11:57:36 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Sameer Nanda <snanda@...omium.org>
Subject: Re: [PATCH 3/3] mfd: cros_ec_dev: Register cros_usbpd-charger driver
 as a subdevice.

On Wed, 17 Jan 2018, Enric Balletbo i Serra wrote:

> From: Sameer Nanda <snanda@...omium.org>
> 
> Check whether this EC instance has USBPD host command support and
> instatiate the cros_usbpd-charger driver as a subdevice in such case.
> 
> Signed-off-by: Sameer Nanda <snanda@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>  drivers/mfd/cros_ec_dev.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index 26a8731499bf..d98f03f3d251 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -37,6 +37,9 @@ static const struct attribute_group *cros_ec_groups[] = {
>  	&cros_ec_attr_group,
>  	&cros_ec_lightbar_attr_group,
>  	&cros_ec_vbc_attr_group,
> +#if IS_ENABLED(CONFIG_CHARGER_CROS_USB_PD)
> +	&cros_usb_pd_charger_attr_group,
> +#endif

I'd rather not introduce #ifery into *.c files.

Please find another way of doing this.  Perhaps create a nil-Byte
alternative that you can shove away in a header file somewhere?

>  	NULL,
>  };
>  
> @@ -269,6 +272,24 @@ static void __remove(struct device *dev)
>  	kfree(ec);
>  }
>  
> +static const struct mfd_cell cros_usb_pd_charger_devs[] = {
> +	{
> +		.name = "cros-usb-pd-charger",
> +		.id   = -1,

What are you trying to achieve here?

> +	},
> +};
> +
> +static void cros_ec_usb_pd_charger_register(struct cros_ec_dev *ec)
> +{
> +	int ret;
> +
> +	ret = mfd_add_devices(ec->dev, 0, cros_usb_pd_charger_devs,

What does 0 mean here?

> +			      ARRAY_SIZE(cros_usb_pd_charger_devs),
> +			      NULL, 0, NULL);
> +	if (ret)
> +		dev_err(ec->dev, "failed to add usb-pd-charger device\n");
> +}
> +
>  static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>  {
>  	/*
> @@ -451,6 +472,10 @@ static int ec_device_probe(struct platform_device *pdev)
>  	if (cros_ec_debugfs_init(ec))
>  		dev_warn(dev, "failed to create debugfs directory\n");
>  
> +	/* check whether this EC instance has the PD charge manager */
> +	if (cros_ec_check_features(ec, EC_FEATURE_USB_PD))
> +		cros_ec_usb_pd_charger_register(ec);
> +
>  	/* check whether this EC is a sensor hub. */
>  	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
>  		cros_ec_sensors_register(ec);

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