linux-kernel - Re: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration

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Message-ID: <568980a1-9c22-ccdb-de43-ba88cdce4ecd@xs4all.nl>
Date:   Tue, 15 May 2018 17:29:32 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Neil Armstrong <narmstrong@...libre.com>, airlied@...ux.ie,
        hans.verkuil@...co.com, lee.jones@...aro.org, olof@...om.net,
        seanpaul@...gle.com
Cc:     sadolfsson@...gle.com, felixe@...gle.com, bleung@...gle.com,
        darekm@...gle.com, marcheu@...omium.org, fparent@...libre.com,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration

On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> The EC can expose a CEC bus, thus add the cros-ec-cec MFD sub-device
> when the CEC feature bit is present.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>

For what it is worth (not an MFD expert):

Acked-by: Hans Verkuil <hans.verkuil@...co.com>

Thanks!

	Hans

> ---
>  drivers/mfd/cros_ec_dev.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index eafd06f..57064ec 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -383,6 +383,18 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>  	kfree(msg);
>  }
>  
> +static void cros_ec_cec_register(struct cros_ec_dev *ec)
> +{
> +	int ret;
> +	struct mfd_cell cec_cell = {
> +		.name = "cros-ec-cec",
> +	};
> +
> +	ret = mfd_add_devices(ec->dev, 0, &cec_cell, 1, NULL, 0, NULL);
> +	if (ret)
> +		dev_err(ec->dev, "failed to add EC CEC\n");
> +}
> +
>  static int ec_device_probe(struct platform_device *pdev)
>  {
>  	int retval = -ENOMEM;
> @@ -422,6 +434,10 @@ 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 handles CEC. */
> +	if (cros_ec_check_features(ec, EC_FEATURE_CEC))
> +		cros_ec_cec_register(ec);
> +
>  	/* Take control of the lightbar from the EC. */
>  	lb_manual_suspend_ctrl(ec, 1);
>  
>