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SubjectRe: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration
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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);
>>>
>>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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