Re: [PATCH v5 2/3] arm64: dts: qcom: Introduce sa8255p SoC

[Shawn Guo <shengchao.guo@oss.qualcomm.com>]

On Wed, Mar 04, 2026 at 08:28:29PM -0800, Deepti Jaggi wrote:
> From: Nikunj Kela <quic_nkela@quicinc.com>
> 
> Introduce base device tree support for sa8255p Qualcomm's automotive
> infotainment SoC. The base dt file describes core SoC components- CPUs,
> CPU map, ipcc, QUP,  geni UART, interrupt controller, TLMM, reserved
> memory, SMMU, firmware scm, scmi, watchdog, SRAM, PSCI, ufs, pcie, pmu
> nodes and enable booting to shell with ramdisk.
> 
> The Qualcomm automotive sa8255p SoC utilizes firmware to configure
> platform resources such as clocks, interconnects, and TLMM. Device drivers
> request these resources through the SCMI power,reset and performance
> protocols. Assign each device driver a dedicated SCMI channel and Tx/Rx
> doorbells to support parallel resource requests and aggregation in the
> SCMI platform server. Operate the SCMI server stack in an SMP-enabled VM,
> using the Qualcomm SMC/HVC transport driver for communication.
> 
> Group resource operations to improve abstraction and reduce the number of
> SCMI requests. Follow the SCMI-based resource management approach
> demonstrated by Qualcomm at LinaroConnect 2024.[1]
> 
> Limit initial support to basic platform resources, serial console, ufs
> and pcie.Defer enabling USB, and Ethernet to subsequent updates.
> 
> [1]: https://resources.linaro.org/en/resource/wfnfEwBhRjLV1PEAJoDDte
> 
> Co-developed-by: Shazad Hussain <shazad.hussain@oss.qualcomm.com>
> Signed-off-by: Shazad Hussain <shazad.hussain@oss.qualcomm.com>
> Signed-off-by: Nikunj Kela <quic_nkela@quicinc.com>
> Co-developed-by: Deepti Jaggi <deepti.jaggi@oss.qualcomm.com>
> Signed-off-by: Deepti Jaggi <deepti.jaggi@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/sa8255p.dtsi | 4861 +++++++++++++++++++++++++++++++++
>  1 file changed, 4861 insertions(+)

Is my understanding correct that the following SoCs are all members of Lemans family?

 - QCS9075/9100 (IQ9)
 - SA8255P
 - SA8775P

If so, does it make sense to apply DTS structure like below?

  lemans.dtsi
    |
    |― lemans-iq9.dtsi
    |    |
    |    |― lemans-evk.dts (qcs9100-evk.dts ideally)
    |    |
    |    |― qcs9100-ride-r3.dts
    |    |
    |    |― qcs9100-ride.dts
    |
    |― lemans-sa8255p.dtsi
    |    |
    |    |― sa8255p-ride.dts
    |
    |― lemans-sa8775p.dtsi
         |
         |― sa8775p-ride-r3.dts
         |
         |― sa8775p-ride.dts


Shawn