Hi,
On 22/03/2017 21:46, Rick Altherr wrote:
> On Wed, Mar 22, 2017 at 12:21 AM, Quentin Schulz
> <quentin.schulz@xxxxxxxxxxxxxxxxxx> wrote:
>> Hi,
>>
>> On 21/03/2017 21:48, Rick Altherr wrote:
>>> Aspeed AST2400/AST2500 BMC SoCs include a 16 channel, 10-bit ADC. Low
>>> and high threshold interrupts are supported by the hardware but are not
>>> currently implemented.
>>>
>>> Signed-off-by: Rick Altherr <raltherr@xxxxxxxxxx>
>>> ---
>>>
>>> Changes in v2:
>>> - Rewritten as an IIO device
>>> - Renamed register macros to describe the register's purpose
>>> - Replaced awkward reading of 16-bit data registers with readw()
>>> - Added Kconfig dependency on COMPILE_TEST
>>>
[...]
>>> +#define ASPEED_ADC_CHAN(_idx, _addr) { \
>>> + .type = IIO_VOLTAGE, \
>>> + .indexed = 1, \
>>> + .channel = (_idx), \
>>> + .address = (_addr), \
>>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
>>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
>>> + BIT(IIO_CHAN_INFO_SAMP_FREQ), \
>>> +}
>>> +
>>> +static const struct iio_chan_spec aspeed_adc_iio_channels[] = {
>>> + ASPEED_ADC_CHAN(0, 0x10),
>>> + ASPEED_ADC_CHAN(1, 0x12),
>>> + ASPEED_ADC_CHAN(2, 0x14),
>>> + ASPEED_ADC_CHAN(3, 0x16),
>>> + ASPEED_ADC_CHAN(4, 0x18),
>>> + ASPEED_ADC_CHAN(5, 0x1A),
>>> + ASPEED_ADC_CHAN(6, 0x1C),
>>> + ASPEED_ADC_CHAN(7, 0x1E),
>>> + ASPEED_ADC_CHAN(8, 0x20),
>>> + ASPEED_ADC_CHAN(9, 0x22),
>>> + ASPEED_ADC_CHAN(10, 0x24),
>>> + ASPEED_ADC_CHAN(11, 0x26),
>>> + ASPEED_ADC_CHAN(12, 0x28),
>>> + ASPEED_ADC_CHAN(13, 0x2A),
>>> + ASPEED_ADC_CHAN(14, 0x2C),
>>> + ASPEED_ADC_CHAN(15, 0x2E),
>>
>> It would make sense to name the registers (the _addr parameter of your
>> macro) so it's easier to understand what it refers to.
>>
>
> I agree with Joel on this. There isn't really a better name than
> ADC_CHAN_0_DATA. I'll change the macro parameter to _data_reg_addr to
> make that clearer.
>
Is it the name in the datasheet?
[...]
>>> + indio_dev->name = dev_name(&pdev->dev);
>>
>> This isn't good practice (cf.: https://lkml.org/lkml/2017/1/28/145 end
>> of the mail in the probe function). Better name it aspeed-adc or even
>> better to have a different name per compatible: ast2400-adc or ast2500-adc.
>
> Ack. Will use aspeed-adc to avoid parsing the compatible match and
> stripping the 'aspeed,' prefix.
>
You don't need to parse the compatible match. You could use the data
void pointer in your struct of_device_id
(http://lxr.free-electrons.com/source/include/linux/mod_devicetable.h#L234)
like it's done here: https://lkml.org/lkml/2017/3/21/675
(sun4i_gpadc_of_id).
Note: please reply to all :)
Quentin
--
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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