Hi, Ondřej
On 17.08.2023 18:32, Ondřej Jirman wrote:
> On Thu, Aug 17, 2023 at 05:30:04PM +0200, megi xff wrote:
>>
>> On Thu, Aug 17, 2023 at 05:57:55PM +0300, Muhammed Efe Cetin wrote:
>>>
>>> Hi, Ondřej
>>>
>>> On 17.08.2023 16:57, Ondřej Jirman wrote:
>>>> Hi Muhammed,
>>>>
>>>>>>> [...]
>>>>>>
>>>>>>> + vcc_1v1_nldo_s3: vcc-1v1-nldo-s3-regulator {
>>>>>>> + compatible = "regulator-fixed";
>>>>>>> + regulator-name = "vcc_1v1_nldo_s3";
>>>>>>> + regulator-always-on;
>>>>>>> + regulator-boot-on;
>>>>>>> + regulator-min-microvolt = <1100000>;
>>>>>>> + regulator-max-microvolt = <1100000>;
>>>>>>> + vin-supply = <&vcc5v0_sys>;
>>>>>>> + };
>>>>>>
>>>>>> There's no such regulator on the board.
>>>>>
>>>>> It's connected to PMIC https://i.imgur.com/sVJdC5K.png
>>>>
>>>> It's not a separate fixed regulator. It's a PMIC output from buck6 https://megous.com/dl/tmp/8630fa17407c75b9.png
>>>>
>>>
>>> I think it should be fixed regulator. It's used as vcc13-supply and
>>> vcc14-supply regulator on PMIC and it's same as other rk3588 boards.
>>
>> Yes, BUCK6 output is input to some LDOs. If you make this a regulator-fixed,
>> BUCK6 will not get enabled when those LDOs are enabled, and the LDOs will not
>> work because they'll lack input power.
>>
>> Your regulator-fixed does nothing to enable BUCK6 which is where vcc_1v1_nldo_s3
>> power rail is connected.
>>
>> It only works for you now, because dcdc-reg6 is marked as regulator-always-on,
>> so it's already enabled when you need those dependent LDOs.
>
> And if other boards have this same HW setup and user separate DT node with
> regulator-fixed for this, they're broken, too.
As i've seen on upstream and Rockchip SDK; boards have dual RK806, have vcc_1v1_nldo_s3 node inside of pmic (rk3588-evb1-v10) and boards have single RK806, have separated vcc_1v1_nldo_s3 node. I don't know why they preferred this way.
>
> regards,
> o.
>
>> regards,
>> o.
>>
>>>> So this is VDD2_DDR_S3. If you want to keep the alias, just add extra alias to
>>>> dcdc-reg6 like this:
>>>>
>>>> ...
>>>> vcc_1v1_nldo_s3: vdd2_ddr_s3: dcdc-reg6 {
>>>> ...
>>>>
>>>>>>
Regards,
Efe
