[PATCH v3 2/3] arm64: dts: qcom: sm8750: Add PCIe PHY and controller node

[Dmitry Baryshkov]

On Wed, Oct 08, 2025 at 11:11:43AM +0200, Konrad Dybcio wrote:
> On 10/8/25 10:00 AM, Konrad Dybcio wrote:
> > On 10/8/25 6:41 AM, Krishna Chaitanya Chundru wrote:
> >>
> >>
> >> On 10/2/2025 5:07 AM, Bjorn Andersson wrote:
> >>> On Tue, Aug 26, 2025 at 04:32:54PM +0530, Krishna Chaitanya Chundru wrote:
> >>>> Add PCIe controller and PHY nodes which supports data rates of 8GT/s
> >>>> and x2 lane.
> >>>>
> >>>
> >>> I tried to boot the upstream kernel (next-20250925 defconfig) on my
> >>> Pakala MTP with latest LA1.0 META and unless I disable &pcie0 the device
> >>> is crashing during boot as PCIe is being probed.
> >>>
> >>> Is this a known problem? Is there any workaround/changes in flight that
> >>> I'm missing?
> >>>
> >> Hi Bjorn,
> >>
> >> we need this fix for the PCIe to work properly. Please try it once.
> >> https://lore.kernel.org/all/20251008-sm8750-v1-1-daeadfcae980@oss.qualcomm.com/
> > 
> > This surely shouldn't cause/fix any issues, no?
> 
> Apparently this is a real fix, because sm8750.dtsi defines the PCIe
> PHY under a port node, while the MTP DT assigns perst-gpios to the RC
> node, which the legacy binding ("everything under the RC node") parsing
> code can't cope with (please mention that in the commit message, Krishna)
> 
> And I couldn't come up with a way to describe "either both are required
> if any is present under the RC node or none are allowed" in yaml

What about:

oneOf:
  - required:
     - foo
     - bar
  - properties:
     foo: false
     bar: false

-- 
With best wishes
Dmitry