On 4/11/2025 2:42 PM, Konrad Dybcio wrote:
> On 4/11/25 9:15 AM, Jagadeesh Kona wrote:
>>
>>
>> On 4/1/2025 10:03 PM, Konrad Dybcio wrote:
>>> On 3/24/25 9:41 AM, Luca Weiss wrote:
>>>> Add a node for the videocc found on the SM6350 SoC.
>>>>
>>>> Signed-off-by: Luca Weiss <luca.we...@fairphone.com>
>>>> ---
>>>> arch/arm64/boot/dts/qcom/sm6350.dtsi | 14 ++++++++++++++
>>>> 1 file changed, 14 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi
>>>> b/arch/arm64/boot/dts/qcom/sm6350.dtsi
>>>> index
>>>> 42f9d16c2fa6da66a8bb524a33c2687a1e4b40e0..4498d6dfd61a7e30a050a8654d54dae2d06c220c
>>>> 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
>>>> @@ -1952,6 +1952,20 @@ usb_1_dwc3_ss_out: endpoint {
>>>> };
>>>> };
>>>>
>>>> + videocc: clock-controller@aaf0000 {
>>>> + compatible = "qcom,sm6350-videocc";
>>>> + reg = <0x0 0x0aaf0000 0x0 0x10000>;
>>>> + clocks = <&gcc GCC_VIDEO_AHB_CLK>,
>>>> + <&rpmhcc RPMH_CXO_CLK>,
>>>> + <&sleep_clk>;
>>>> + clock-names = "iface",
>>>> + "bi_tcxo",
>>>> + "sleep_clk";
>>>> + #clock-cells = <1>;
>>>> + #reset-cells = <1>;
>>>> + #power-domain-cells = <1>;
>>>> + };
>>>
>>> You'll probably want to hook up some additional power domains here, see
>>>
>>> https://lore.kernel.org/linux-arm-msm/20250327-videocc-pll-multi-pd-voting-v3-0-895fafd62...@quicinc.com/
>>>
>>
>> On SM6350, videocc doesn't need multiple power domains at HW level, it is
>> only on CX rail which would be ON
>> when system is active, hence power-domains are not mandatory here.
>
> 6350 doesn't have either MMCX nor a split MX - shouldn't both normal
> CX and MX be in there?
>
All clocks & GDSC's of SM6350 videocc are only on CX rail, so it requires only
CX power domain. But when HLOS
is active, CX rail will be ON and operate at a level above retention, which is
sufficient for videocc to operate.
Hence clock driver don't need to explicitly vote on CX rail.
The same is not true for other rails like MMCX and Split MX(MXC), hence clock
drivers had to explicitly vote on
those rails.
Thanks,
Jagadeesh
> Konrad
