Re: [PATCH v2 2/4] iio: adc: meson-saradc: add support for Meson S4

[Krzysztof Kozlowski <krzk@kernel.org>]

On 23/03/2026 21:05, Jonathan Cameron wrote:
> On Mon, 23 Mar 2026 08:54:21 +0100
> Krzysztof Kozlowski <krzk@kernel.org> wrote:
> 
>> On Mon, Mar 23, 2026 at 09:34:06AM +0800, Nick Xie wrote:
>>> Add support for the SARADC found on the Amlogic Meson S4 SoC.
>>> According to the documentation and current testing, it is fully
>>> compatible with the G12A parameter set, so we reuse
>>> `meson_sar_adc_g12a_data` for this new compatible string.
>>>
>>> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>>> Signed-off-by: Nick Xie <nick@khadas.com>
>>> ---
>>>  drivers/iio/adc/meson_saradc.c | 8 ++++++++
>>>  1 file changed, 8 insertions(+)
>>>
>>> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
>>> index 47cd350498a0d..3ac48b7842c4f 100644
>>> --- a/drivers/iio/adc/meson_saradc.c
>>> +++ b/drivers/iio/adc/meson_saradc.c
>>> @@ -1313,6 +1313,11 @@ static const struct meson_sar_adc_data meson_sar_adc_g12a_data = {
>>>  	.name = "meson-g12a-saradc",
>>>  };
>>>  
>>> +static const struct meson_sar_adc_data meson_sar_adc_s4_data = {
>>> +	.param = &meson_sar_adc_g12a_param,
>>> +	.name = "meson-s4-saradc",
>>> +};
>>> +
>>>  static const struct of_device_id meson_sar_adc_of_match[] = {
>>>  	{
>>>  		.compatible = "amlogic,meson8-saradc",
>>> @@ -1341,6 +1346,9 @@ static const struct of_device_id meson_sar_adc_of_match[] = {
>>>  	}, {
>>>  		.compatible = "amlogic,meson-g12a-saradc",
>>>  		.data = &meson_sar_adc_g12a_data,
>>> +	}, {
>>> +		.compatible = "amlogic,meson-s4-saradc",  
>>
>> The point of compatible devices is to not add such entries. Drop.
> It's used for naming in the userspace ABI which is supposed to reflect the part number.

Indeed, I saw this pattern in more places. Does userspace need it? There
is no "compatible" entry shown?

If there is no, then probably this could be automated by taking the name
from compatible after ',', but that would be out of scope for this set,
so here it is fine.


Best regards,
Krzysztof