On Mon, Sep 08, 2025 at 05:46:30PM +0800, Yongxing Mou wrote:
>
>
> On 9/5/2025 9:48 PM, Dmitry Baryshkov wrote:
> > On Fri, Sep 05, 2025 at 10:50:33AM +0800, Yongxing Mou wrote:
> > >
> > >
> > > On 9/4/2025 9:43 PM, Dmitry Baryshkov wrote:
> > > > On Thu, Sep 04, 2025 at 03:22:37PM +0800, Yongxing Mou wrote:
> > > > > Add compatible string for the DisplayPort controller found on the
> > > > > Qualcomm QCS8300 SoC.
> > > > >
> > > > > The Qualcomm QCS8300 platform comes with one DisplayPort controller
> > > > > that supports 4 MST streams.
> > > > >
> > > > > Signed-off-by: Yongxing Mou <yongxing....@oss.qualcomm.com>
> > > > > ---
> > > > > .../bindings/display/msm/dp-controller.yaml | 22
> > > > > ++++++++++++++++++++++
> > > > > 1 file changed, 22 insertions(+)
> > > > >
> > > > > diff --git
> > > > > a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> > > > > b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> > > > > index
> > > > > aeb4e4f36044a0ff1e78ad47b867e232b21df509..ad08fd11588c45698f7e63ecc3218a749fc8ca67
> > > > > 100644
> > > > > --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> > > > > +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> > > > > @@ -18,6 +18,7 @@ properties:
> > > > > compatible:
> > > > > oneOf:
> > > > > - enum:
> > > > > + - qcom,qcs8300-dp
> > > >
> > > > Can we use fallback to qcom,sa8775p-dp instead of declaring a completely
> > > > new one?
> > > >
> > > I think we can not use fallback to sa8775p, since we don't have DP1
> > > controller for QCS8300. SA8775P actually have 4 DP controllers (now only 2
> > > really used). So in the hardware, i think it is different with SA8775P and
> > > we need a new one.>> - qcom,sa8775p-dp
> >
> > The DP controller is the same as the one present on SA8775P.
> >
> Yes, it is same.. I just want to confirm again—even if we only need DP0 for
> QCS8300, we can also use sa8775p as fallback, right?
What makes you think that we can't? Let me repharse the question: which
part of DP controller (single one) on QCS8300 is incompatible with the
DP controller on SA8775P?
>
> static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
> { .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported
> = true },
> { .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported
> = true },
> { .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported
> = true },
> { .io_start = 0x2215c000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported
> = true },
> {}
> };
> .mst_streams = 4 is suitable for both QCS8300 and SA8775P DP 0 here.
>
> Previously, my understanding here was that we might need a new compatible
> for QCS8300.
>
> Thanks~~>>>> - qcom,sc7180-dp
> > > > > - qcom,sc7280-dp
> >
>
--
With best wishes
Dmitry
