Re: [PATCH 1/2] arm64: dts: qcom: sc8280xp: add several missing pdc map entries

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 4/20/26 12:47 PM, Pengyu Luo wrote:
> On Mon, Apr 20, 2026 at 6:21 PM Konrad Dybcio
> <konrad.dybcio@oss.qualcomm.com> wrote:
>>
>> On 4/20/26 11:53 AM, Pengyu Luo wrote:
>>> On Mon, Apr 20, 2026 at 4:32 PM Konrad Dybcio
>>> <konrad.dybcio@oss.qualcomm.com> wrote:
>>>>
>>>> On 4/19/26 7:32 PM, Pengyu Luo wrote:
>>>>> pdc 215, 256, 257 are missing, but we can find tlmm pin 103, 84, 90
>>>>> are mapped to them respectively, so add the map entries from pdc to
>>>>> gic. These entries are reversed from .data section of qcgpio.sys
>>>>>
>>>>> Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com>
>>>>> ---
>>>>
>>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
>>>>
>>>> Konrad
>>>>
>>>> The below change on top will fully align it with the data in the docs
>>>> (no functional change)
>>>>
>>>
>>> Glad to know. Could you please help to check the tlmm map too? When I
>>> was parsing the binary, I found
>>>
>>> tlmm 65535 => pdc 70 => gic 520
>>> tlmm 65535 => pdc 174 => gic 733
>>> tlmm 65535 => pdc 175 => gic 734
>>> tlmm 65535 => pdc 176 => gic 735
>>> tlmm 65535 => pdc 177 => gic 736
>>> tlmm 65535 => pdc 178 => gic 737
>>> tlmm 65535 => pdc 184 => gic 743
>>> tlmm 65535 => pdc 185 => gic 744
>>> tlmm 65535 => pdc 186 => gic 745
>>> tlmm 65535 => pdc 187 => gic 746
>>> tlmm 65535 => pdc 188 => gic 747
>>> tlmm 65535 => pdc 194 => gic 753
>>> tlmm 65535 => pdc 195 => gic 754
>>> tlmm 65535 => pdc 196 => gic 755
>>> tlmm 65535 => pdc 197 => gic 756
>>> tlmm 65535 => pdc 198 => gic 757
>>> tlmm 65535 => pdc 199 => gic 416
>>> tlmm 65535 => pdc 204 => gic 462
>>> tlmm 65535 => pdc 205 => gic 264
>>>
>>> If 65536 means the pin is missing, I will send v2 to remove the tlmm
>>> map together with the pdc removal.
>>
>> These seem to be LPASS/SSC GPIOs
>>
>> There are missing pairs of:
>>
>> TLMM 151 -> PDC 264 -> GIC 191
>> TLMM 143 -> PDC 261 -> GIC 402
>>
>> and very interestingly, GPIO 190 has two mappings:
>> PDC 70 -> GIC 552
> 
> PDC 70 is connected to swr2, which is wakeable. Speaking of this, in
> qcom,pdc.yaml
> 
> Drivers requiring wakeup capabilities of their device interrupts
> routed through the PDC, must specify PDC as their interrupt controller
> and request the PDC port associated with the GIC interrupt.
> 
> But swr2 specifies GIC.
> 
> I wonder, when should we use tlmm, when pdc, when gic?

I would assume "pdc, whenever available"

Konrad