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Subject: Re: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration
To:     Enric Balletbo Serra <eballetbo@gmail.com>,
        Hans Verkuil <hverkuil@xs4all.nl>
Cc:     David Airlie <airlied@linux.ie>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        Lee Jones <lee.jones@linaro.org>,
        Olof Johansson <olof@lixom.net>, seanpaul@google.com,
        sadolfsson@google.com, intel-gfx@lists.freedesktop.org,
        linux-kernel <linux-kernel@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Fabien Parent <fparent@baylibre.com>, felixe@google.com,
        =?UTF-8?Q?St=c3=a9phane_Marchesin?= <marcheu@chromium.org>,
        Benson Leung <bleung@google.com>, darekm@google.com,
        linux-media@vger.kernel.org
References: <1526395342-15481-1-git-send-email-narmstrong@baylibre.com>
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 <568980a1-9c22-ccdb-de43-ba88cdce4ecd@xs4all.nl>
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From:   Neil Armstrong <narmstrong@baylibre.com>
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Message-ID: <0ac61992-3946-63f2-02ed-0dcfa3058a1a@baylibre.com>
Date:   Wed, 16 May 2018 09:42:22 +0200
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Hi Enric,

On 15/05/2018 18:40, Enric Balletbo Serra wrote:
> Hi Neil,
> 
> I suspect that this patch will conflict with some patches that will be
> queued for 4.18 that also introduces new devices, well, for now I
> don't see these merged in the Lee's tree.

Indeed, I found your patches, I'll rebase this one when Lee pushes them in his tree.

> 
> Based on some reviews I got when I send a patch to this file ...
> 
> 2018-05-15 17:29 GMT+02:00 Hans Verkuil <hverkuil@xs4all.nl>:
>> 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@baylibre.com>
>>
>> For what it is worth (not an MFD expert):
>>
>> Acked-by: Hans Verkuil <hans.verkuil@cisco.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");
>>> +}
>>> +
> 
> Do not create a single function to only call mfd_add_devices, instead
> do the following on top:
> 
> static const struct mfd_cell cros_ec_cec_cells[] = {
>         { .name = "cros-ec-cec" }
> };

OK

> 
> 
>>>  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);
>>> +
> 
> and use PLATFORM_DEVID_AUTO and the ARRAY_SIZE macro, something like this.
> 
> /* Check whether this EC instance handles CEC */
> if (cros_ec_check_features(ec, EC_FEATURE_CEC)) {
>         retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
>                                                   cros_ec_cec_cells,
>                                                   ARRAY_SIZE(cros_ec_cec_cells),
>                                                   NULL, 0, NULL);
>         if (retval)
>                 dev_err(ec->dev, "failed to add cros-ec-cec device: %d\n",
>                              retval);
> }

Ok, like the RTC registration.

Thanks,
Neil

> 
> Best regards,
>   Enric
> 
>>>       /* Take control of the lightbar from the EC. */
>>>       lb_manual_suspend_ctrl(ec, 1);
>>>
>>>
>>
>> _______________________________________________
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>> dri-devel@lists.freedesktop.org
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