Re: [PATCH v2 0/6] arm64: dts: qcom: nord: Add remoteproc and PMIC support

[Shawn Guo]

On Wed, Sep 09, 2026 at 02:13:35PM +0200, Konrad Dybcio wrote:
> On 9/7/26 2:06 PM, Shawn Guo wrote:
> > On Fri, Sep 04, 2026 at 12:00:40PM +0200, Konrad Dybcio wrote:
> >> On 9/4/26 10:16 AM, Shawn Guo wrote:
> >>> This series adds ADSP and CDSP remoteproc support, the SPMI PMIC arbiter
> >>> and the PMIC descriptions for the Qualcomm Nord platform, and adds the
> >>> initial device tree for the Nord Ride Embedded board.
> >>>
> >>> Tested on next-20260903
> >>>
> >>> Dependencies:
> >>> - NMXC define: commit e484a765f543 ("dt-bindings: power: qcom,rpmhpd: Add NMXC power domain index")
> >>>   from git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm.git dt
> >>> - Base DTS: https://lore.kernel.org/all/20260903140617.441111-1-shengchao.guo@xxxxxxxxxxxxxxxx/
> >>> - PMAU0102 MFD: https://lore.kernel.org/all/20260830034719.140213-1-shengchao.guo@xxxxxxxxxxxxxxxx/
> >>> - PMAU0102 thermal: https://lore.kernel.org/all/20260830101025.191697-1-shengchao.guo@xxxxxxxxxxxxxxxx/
> >>> - PMM8654AU RTC: https://lore.kernel.org/all/20260904074541.590485-1-shengchao.guo@xxxxxxxxxxxxxxxx/
> >>>
> >>> Changes for v2:
> >>> - Align PMIC comments in nord-ride-embedded.dts with nord-rrd.dts
> >>> - Drop unneeded regulator-always-on and regulator-boot-on from RPMh
> >>>   regulators
> >>
> >> It still remains on something like 40% of the defined regulators
> >> without any nearby comment justifying that - are all of these
> >> intentional and necessary?
> > 
> > Yes, all of those are intentional.
> > 
> > - Supplies of LPDDR5
> > 
> >   vreg_s1a_vdd2h_l  -->  VDD2H_LPDDR5_01
> >   vreg_s5g_vdd2h_h  -->  VDD2H_LPDDR5_23
> >   vreg_l1k_vdd2l    -->  VDD2L_LPDDR5_01
> >   vreg_l1f_vdd2l    -->  VDD2L_LPDDR5_23
> >   vreg_l3k_vdd1     -->  VDD1_LPDDR5_01
> >   vreg_l3f_vdd1     -->  VDD1_LPDDR5_23
> > 
> > - Supplies of PMICs
> > 
> >   vreg_l8a_1p8     -->  VDD_LDO_XO
> >   vreg_s3a_1p8     -->  VDD_PX3 
> >   vreg_s5a_mv      -->  VREG_LDO_MV
> >   vreg_s7f_lv_sub  -->  VREG_LDO_LV
> > 
> > - Supplies of Nord SoC
> > 
> >   vreg_l7a_1p2     -->  VDD_PX14
> 
> Does RPMH require HLOS to cast these votes? Generally such supplies
> should be taken care of in the fw

Good point! I just did a couple of tests by:

- dropping regulator-always-on/regulator-boot-on from these regulators
- dropping these regulators completely from DTS

Both booted fine (the nhlos software for Nord Embedded variant are still
under heavy development though).

So what do you prefer, dropping always-on/boot-on property or
the regulators completely?

Shawn