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SubjectRe: [PATCH v4 3/3] iio: adc: add support for Allwinner SoCs ADC
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On 05/09/16 07:29, Quentin Schulz wrote:
> On 04/09/2016 16:35, Jonathan Cameron wrote:
>> On 01/09/16 15:05, Quentin Schulz wrote:
>>> The Allwinner SoCs all have an ADC that can also act as a touchscreen
>>> controller and a thermal sensor. This patch adds the ADC driver which is
>>> based on the MFD for the same SoCs ADC.
>>>
>>> This also registers the thermal adc channel in the iio map array so
>>> iio_hwmon could use it without modifying the Device Tree. This registers
>>> the driver in the thermal framework.
>>>
>>> This driver probes on three different platform_device_id to take into
>>> account slight differences (registers bit and temperature computation)
>>> between Allwinner SoCs ADCs.
>>>
>>> Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
>> One utterly trivial point about unrolling code ordering inline.
>>
>> Other than the bit about patch 1 I'm basically happy with this..
>
> ACK. Will revert this patch in v5. Thanks.
>
>> However I would like some input (i.e. an Ack) from thermal given this
>> sets up a thermal zone.
>>
>> Zhang or Eduardo, could you take a quick look at this and confirm you
>> are happy with it?
>>
>> Thanks,
>>
>> Jonathan
> [...]
>>> +
>>> +err_map:
>>> + iio_map_array_unregister(indio_dev);
>>> +
>>> +err_fifo_irq:
>>> + /* Disable FIFO_DATA_PENDING interrupt on hardware side. */
>>> + regmap_update_bits(info->regmap, SUN4I_GPADC_INT_FIFOC,
>>> + SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN,
>>> + 0);
>>> +
>>> +err_temp_irq:
>>> + /* Disable TEMP_DATA_PENDING interrupt on hardware side. */
>>> + regmap_update_bits(info->regmap, SUN4I_GPADC_INT_FIFOC,
>>> + SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN,
>>> + 0);
>>> +
>>> +err:
>>> + pm_runtime_put(&pdev->dev);
>>> + pm_runtime_disable(&pdev->dev);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static int sun4i_gpadc_remove(struct platform_device *pdev)
>>> +{
>>> + struct sun4i_gpadc_dev *info;
>>> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
>>> +
>>> + info = iio_priv(indio_dev);
>>> + iio_device_unregister(indio_dev);
>>> + iio_map_array_unregister(indio_dev);
>>> + pm_runtime_put(&pdev->dev);
>>> + pm_runtime_disable(&pdev->dev);
>> Its really minor but in the interests of 'obviously correct' making
>> review easy I'd rather everything in the remove was in the reverse order
>> of probe (and hence the same as the error path in probe for most of it).
>>
>> That would put the pm_runtime stuff last I think..
>>
>> If you weren't rerolling anyway over patch 1 I'd probably have just let
>> this go, but might as well make this trivial change as well.
>>
>
> I'm going with the following order:
> pm_runtime_put
> pm_runtime_disable
> regmap_update_bits
> iio_map_array_unregister
> iio_device_unregister
>
> Is that okay? (I don't really know which one of iio_map_array_unregister
> or iio_device_unregister to put first, if it matters in any way).
Unless we have a really complex race condition involving a client driver
coming up just as the provider is unregistered I doubt it matters.

At some point we should probably chase down any paths through that
with some carefully crafted tests but it's in the seriously unlikely
category!

Jonathan
>
> Thanks!
> Quentin
>>
>>> + /*
>>> + * Disable TEMP_DATA_PENDING and FIFO_DATA_PENDING interrupts on
>>> + * hardware side.
>>> + */
>>> + regmap_update_bits(info->regmap, SUN4I_GPADC_INT_FIFOC,
>>> + SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN |
>>> + SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN,
>>> + 0);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct platform_device_id sun4i_gpadc_id[] = {
>>> + { "sun4i-a10-gpadc-iio", (kernel_ulong_t)&sun4i_gpadc_soc_specific },
>>> + { "sun5i-a13-gpadc-iio", (kernel_ulong_t)&sun5i_gpadc_soc_specific },
>>> + { "sun6i-a31-gpadc-iio", (kernel_ulong_t)&sun6i_gpadc_soc_specific },
>>> + { /* sentinel */ },
>>> +};
>>> +
>>> +static struct platform_driver sun4i_gpadc_driver = {
>>> + .driver = {
>>> + .name = "sun4i-gpadc-iio",
>>> + .pm = &sun4i_gpadc_pm_ops,
>>> + },
>>> + .id_table = sun4i_gpadc_id,
>>> + .probe = sun4i_gpadc_probe,
>>> + .remove = sun4i_gpadc_remove,
>>> +};
>>> +
>>> +module_platform_driver(sun4i_gpadc_driver);
>>> +
>>> +MODULE_DESCRIPTION("ADC driver for sunxi platforms");
>>> +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
>>> +MODULE_LICENSE("GPL v2");
>>>
>>
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