Re: [PATCH v3 6/6] ARM: configs: at91: sama7_defconfig: add MCHP PDMC and DMIC drivers

[<Codrin.Ciubotariu@microchip.com>]

On 05.05.2022 16:58, Nicolas Ferre wrote:
> On 07/03/2022 at 13:22, Codrin Ciubotariu wrote:
>> Enable drivers needed for Microchip's PDMC and PDM microphones.
>>
>> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
>> ---
>>
>> Changes in v2,v3:
>>   - none;
>>
>>   arch/arm/configs/sama7_defconfig | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/arm/configs/sama7_defconfig 
>> b/arch/arm/configs/sama7_defconfig
>> index 0368068e04d9..bc29badab890 100644
>> --- a/arch/arm/configs/sama7_defconfig
>> +++ b/arch/arm/configs/sama7_defconfig
>> @@ -138,6 +138,8 @@ CONFIG_SND_SOC_MIKROE_PROTO=m
>>   CONFIG_SND_MCHP_SOC_I2S_MCC=y
>>   CONFIG_SND_MCHP_SOC_SPDIFTX=y
>>   CONFIG_SND_MCHP_SOC_SPDIFRX=y
>> +CONFIG_SND_MCHP_SOC_PDMC=y
>> +CONFIG_SND_SOC_DMIC=y
> 
> I'm fine with that, but I see that some Kconfig entries "select" this 
> SND_SOC_DMIC directly (amd, intel, mediatek, stm).
> If it's absolutely needed for PDMC to work, what about doing the same as 
> it would prevent some broken configurations?

The only way it makes sense to me to have this driver selected somewhere 
is in a sound card driver, used for a specific board, which we know it 
has PDM microphones. Since, for now, we use the simple sound card for 
our audio interfaces, we have no place to add this select.
The reason I do not like to add this select under the controller driver, 
as some of the vendors did, is because, in the future, we might have 
different PDM microphones that might not work with SND_SOC_DMIC and 
might need a different driver.
I don't have a strong opinion on this. If you think I am overthinking, 
please let me know and I will change this.

Best regards,
Codrin