[PATCH v4 0/2] Enable DPU and Display Port for Qualcomm QCS8300-ride platform

[PATCH v4 0/2] Enable DPU and Display Port for Qualcomm QCS8300-ride platform

[Yongxing Mou]

This series adds the MDSS, DPU and DPTX0 node on Qualcomm QCS8300 SoC.
It also enables Display Port on Qualcomm QCS8300-ride platform.

Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
---
This series make top of 3 dt-bindings
https://lore.kernel.org/all/20250717-dp_mst_bindings-v3-0-72ce08285703@oss.qualcomm.com/
https://lore.kernel.org/all/20250730072725.1433360-1-quic_yongmou@quicinc.com/
https://lore.kernel.org/all/20250730-mdssdt_qcs8300-v5-0-bc8ea35bbed6@quicinc.com/
---
Changes in v4:Fixed review comments from Krzysztof.
- Add the 4 pixel stream register regions and the correspondings clocks of the DP controller.
- Change DP controlller compatible to qcs8300-dp.
- Rebase to next-20250717.
- Link to v3: https://lore.kernel.org/r/20250114-dts_qcs8300-v3-0-d114cc5e4af9@quicinc.com

Changes in v3:Fixed review comments from Konrad, Dmitry.
- Correct the Power-domain for DP PHY should be
  RPMHPD_MX.[Dmitry][Konrad]
- Correct the interconnects path for mdp and align the property order
  with x1e80100.dtsi.[Konrad]
- Rebase the patch to latest code base and update the dependencies in
  the cover letter.
- Link to v2: https://lore.kernel.org/r/20241226-dts_qcs8300-v2-0-ec8d4fb65cba@quicinc.com

Changes in v2:Fixed review comments from Konrad, Dmitry and Krzysztof.
- Reuse eDP PHY and DPU of SA8775 Platform.[Dmitry][Krzysztof]
- Reuse DisplayPort controller of SM8650.[Dmitry]
- Correct the regs length, format issues and power-domains.[Konrad]
- Integrate the dt changes of DPU and DP together.
- Link to v1: https://lore.kernel.org/all/20241127-dp_dts_qcs8300-v1-0-e3d13dec4233@quicinc.com/
~

---
Yongxing Mou (2):
      arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY
      arm64: dts: qcom: qcs8300-ride: Enable Display Port

 arch/arm64/boot/dts/qcom/qcs8300-ride.dts |  42 ++++++
 arch/arm64/boot/dts/qcom/qcs8300.dtsi     | 216 +++++++++++++++++++++++++++++-
 2 files changed, 257 insertions(+), 1 deletion(-)
---
base-commit: 024e09e444bd2b06aee9d1f3fe7b313c7a2df1bb
change-id: 20241225-dts_qcs8300-4d4299067306
prerequisite-message-id: <20250113-dpphy_qcs9300-v1-1-842798ceee78@quicinc.com>
prerequisite-patch-id: 2ea89bba3c9c6ba37250ebd947c1d4acedc78a5d
prerequisite-message-id: <20250113-mdssdt_qcs8300-v3-0-6c8e93459600@quicinc.com>
prerequisite-patch-id: b798711c6a9bd9c4f0b692835865235e78cd2adb
prerequisite-patch-id: 146c61567c42bf5268d1005f8e9b307ea2af93d9
prerequisite-patch-id: 3ce5246ad3470d7392df23a52b3c8b8bd1662db6
prerequisite-patch-id: e81de8a09467a49eaeb4af73a0e197e4156ce202
prerequisite-message-id: <20250717-dp_mst_bindings-v3-0-72ce08285703@oss.qualcomm.com>
prerequisite-patch-id: 4782272bb7d2403e2f2dbf762586d4570e6b6ba6
prerequisite-patch-id: cfdd5c37d38b2a4f1386af4021ba3920c6d8dcf8
prerequisite-patch-id: c874bf64aec8cb2ff0bc91051620ac771cbeeeea
prerequisite-patch-id: 63defbfb812a2f9c6365a98538421aea374e0e13
prerequisite-patch-id: 0ffa9d544d516d4e14700229a4ab6a9c7751823f

Best regards,
-- 
Yongxing Mou <quic_yongmou@quicinc.com>

[PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

[Yongxing Mou]

Add devicetree changes to enable MDSS display-subsystem,
display-controller(DPU), DisplayPort controller and eDP PHY for
Qualcomm QCS8300 platform.

Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
---
 arch/arm64/boot/dts/qcom/qcs8300.dtsi | 216 +++++++++++++++++++++++++++++++++-
 1 file changed, 215 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/qcs8300.dtsi b/arch/arm64/boot/dts/qcom/qcs8300.dtsi
index 7ada029c32c1f2d0488a3fd1be603887c64bf4f9..93797696c72a2001dc0564454da281745f0a7433 100644
--- a/arch/arm64/boot/dts/qcom/qcs8300.dtsi
+++ b/arch/arm64/boot/dts/qcom/qcs8300.dtsi
@@ -4308,6 +4308,218 @@ camcc: clock-controller@ade0000 {
 			#power-domain-cells = <1>;
 		};
 
+		mdss: display-subsystem@ae00000 {
+			compatible = "qcom,qcs8300-mdss";
+			reg = <0x0 0x0ae00000 0x0 0x1000>;
+			reg-names = "mdss";
+
+			interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>;
+
+			clocks = <&dispcc MDSS_DISP_CC_MDSS_AHB_CLK>,
+				 <&gcc GCC_DISP_HF_AXI_CLK>,
+				 <&dispcc MDSS_DISP_CC_MDSS_MDP_CLK>;
+
+			resets = <&dispcc MDSS_DISP_CC_MDSS_CORE_BCR>;
+
+			interconnects = <&mmss_noc MASTER_MDP0 QCOM_ICC_TAG_ALWAYS
+					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
+					<&mmss_noc MASTER_MDP1 QCOM_ICC_TAG_ALWAYS
+					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
+					<&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
+					 &config_noc SLAVE_DISPLAY_CFG QCOM_ICC_TAG_ACTIVE_ONLY>;
+			interconnect-names = "mdp0-mem",
+					     "mdp1-mem",
+					     "cpu-cfg";
+
+			power-domains = <&dispcc MDSS_DISP_CC_MDSS_CORE_GDSC>;
+
+			iommus = <&apps_smmu 0x1000 0x402>;
+
+			interrupt-controller;
+			#interrupt-cells = <1>;
+
+			#address-cells = <2>;
+			#size-cells = <2>;
+			ranges;
+
+			status = "disabled";
+
+			mdss_mdp: display-controller@ae01000 {
+				compatible = "qcom,qcs8300-dpu", "qcom,sa8775p-dpu";
+				reg = <0x0 0x0ae01000 0x0 0x8f000>,
+				      <0x0 0x0aeb0000 0x0 0x2008>;
+				reg-names = "mdp", "vbif";
+
+				clocks = <&gcc GCC_DISP_HF_AXI_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_AHB_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_MDP_LUT_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_MDP_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
+				clock-names = "bus",
+					      "iface",
+					      "lut",
+					      "core",
+					      "vsync";
+
+				assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
+				assigned-clock-rates = <19200000>;
+
+				operating-points-v2 = <&mdp_opp_table>;
+				power-domains = <&rpmhpd RPMHPD_MMCX>;
+
+				interrupt-parent = <&mdss>;
+				interrupts = <0>;
+
+				ports {
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					port@0 {
+						reg = <0>;
+
+						dpu_intf0_out: endpoint {
+							remote-endpoint = <&mdss_dp0_in>;
+						};
+					};
+				};
+
+				mdp_opp_table: opp-table {
+					compatible = "operating-points-v2";
+
+					opp-375000000 {
+						opp-hz = /bits/ 64 <375000000>;
+						required-opps = <&rpmhpd_opp_svs_l1>;
+					};
+
+					opp-500000000 {
+						opp-hz = /bits/ 64 <500000000>;
+						required-opps = <&rpmhpd_opp_nom>;
+					};
+
+					opp-575000000 {
+						opp-hz = /bits/ 64 <575000000>;
+						required-opps = <&rpmhpd_opp_turbo>;
+					};
+
+					opp-650000000 {
+						opp-hz = /bits/ 64 <650000000>;
+						required-opps = <&rpmhpd_opp_turbo_l1>;
+					};
+				};
+			};
+
+			mdss_dp0_phy: phy@aec2a00 {
+				compatible = "qcom,qcs8300-edp-phy", "qcom,sa8775p-edp-phy";
+
+				reg = <0x0 0x0aec2a00 0x0 0x19c>,
+				      <0x0 0x0aec2200 0x0 0xec>,
+				      <0x0 0x0aec2600 0x0 0xec>,
+				      <0x0 0x0aec2000 0x0 0x1c8>;
+
+				clocks = <&dispcc MDSS_DISP_CC_MDSS_DPTX0_AUX_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_AHB_CLK>;
+				clock-names = "aux",
+					      "cfg_ahb";
+
+				power-domains = <&rpmhpd RPMHPD_MX>;
+
+				#clock-cells = <1>;
+				#phy-cells = <0>;
+
+				status = "disabled";
+			};
+
+			mdss_dp0: displayport-controller@af54000 {
+				compatible = "qcom,qcs8300-dp";
+
+				reg = <0x0 0x0af54000 0x0 0x200>,
+				      <0x0 0x0af54200 0x0 0x200>,
+				      <0x0 0x0af55000 0x0 0xc00>,
+				      <0x0 0x0af56000 0x0 0x400>;
+
+				interrupt-parent = <&mdss>;
+				interrupts = <12>;
+
+				clocks = <&dispcc MDSS_DISP_CC_MDSS_AHB_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_AUX_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_LINK_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_LINK_INTF_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL0_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL1_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL2_CLK>,
+					 <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL3_CLK>;
+				clock-names = "core_iface",
+					      "core_aux",
+					      "ctrl_link",
+					      "ctrl_link_iface",
+					      "stream_pixel",
+					      "stream_1_pixel",
+					      "stream_2_pixel",
+					      "stream_3_pixel";
+				assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_DPTX0_LINK_CLK_SRC>,
+						  <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL0_CLK_SRC>,
+						  <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL1_CLK_SRC>,
+						  <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL2_CLK_SRC>,
+						  <&dispcc MDSS_DISP_CC_MDSS_DPTX0_PIXEL3_CLK_SRC>;
+				assigned-clock-parents = <&mdss_dp0_phy 0>,
+							 <&mdss_dp0_phy 1>,
+							 <&mdss_dp0_phy 1>,
+							 <&mdss_dp0_phy 1>;
+				phys = <&mdss_dp0_phy>;
+				phy-names = "dp";
+
+				operating-points-v2 = <&dp_opp_table>;
+				power-domains = <&rpmhpd RPMHPD_MMCX>;
+
+				#sound-dai-cells = <0>;
+
+				status = "disabled";
+
+				ports {
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					port@0 {
+						reg = <0>;
+
+						mdss_dp0_in: endpoint {
+							remote-endpoint = <&dpu_intf0_out>;
+						};
+					};
+
+					port@1 {
+						reg = <1>;
+
+						mdss_dp0_out: endpoint { };
+					};
+				};
+
+				dp_opp_table: opp-table {
+					compatible = "operating-points-v2";
+
+					opp-160000000 {
+						opp-hz = /bits/ 64 <160000000>;
+						required-opps = <&rpmhpd_opp_low_svs>;
+					};
+
+					opp-270000000 {
+						opp-hz = /bits/ 64 <270000000>;
+						required-opps = <&rpmhpd_opp_svs>;
+					};
+
+					opp-540000000 {
+						opp-hz = /bits/ 64 <540000000>;
+						required-opps = <&rpmhpd_opp_svs_l1>;
+					};
+
+					opp-810000000 {
+						opp-hz = /bits/ 64 <810000000>;
+						required-opps = <&rpmhpd_opp_nom>;
+					};
+				};
+			};
+		};
+
 		dispcc: clock-controller@af00000 {
 			compatible = "qcom,sa8775p-dispcc0";
 			reg = <0x0 0x0af00000 0x0 0x20000>;
@@ -4315,7 +4527,9 @@ dispcc: clock-controller@af00000 {
 				 <&rpmhcc RPMH_CXO_CLK>,
 				 <&rpmhcc RPMH_CXO_CLK_A>,
 				 <&sleep_clk>,
-				 <0>, <0>, <0>, <0>,
+				 <&mdss_dp0_phy 0>,
+				 <&mdss_dp0_phy 1>,
+				 <0>, <0>,
 				 <0>, <0>, <0>, <0>;
 			power-domains = <&rpmhpd RPMHPD_MMCX>;
 			#clock-cells = <1>;

-- 
2.34.1

[PATCH v4 2/2] arm64: dts: qcom: qcs8300-ride: Enable Display Port

[Yongxing Mou]

Enable DPTX0 along with their corresponding PHYs for
qcs8300-ride platform.

Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
---
 arch/arm64/boot/dts/qcom/qcs8300-ride.dts | 42 +++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcs8300-ride.dts b/arch/arm64/boot/dts/qcom/qcs8300-ride.dts
index 8c166ead912c589c01d2bc7d13fa1b6892f6252b..1ce4a3138eac45147eacf5fde8a7eaa79a9af9b1 100644
--- a/arch/arm64/boot/dts/qcom/qcs8300-ride.dts
+++ b/arch/arm64/boot/dts/qcom/qcs8300-ride.dts
@@ -23,6 +23,18 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	dp0-connector {
+		compatible = "dp-connector";
+		label = "DP0";
+		type = "full-size";
+
+		port {
+			dp0_connector_in: endpoint {
+				remote-endpoint = <&mdss_dp0_out>;
+			};
+		};
+	};
+
 	regulator-usb2-vbus {
 		compatible = "regulator-fixed";
 		regulator-name = "USB2_VBUS";
@@ -308,6 +320,30 @@ &iris {
 	status = "okay";
 };
 
+&mdss {
+	status = "okay";
+};
+
+&mdss_dp0 {
+	pinctrl-0 = <&dp_hot_plug_det>;
+	pinctrl-names = "default";
+
+	status = "okay";
+};
+
+&mdss_dp0_out {
+	data-lanes = <0 1 2 3>;
+	link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
+	remote-endpoint = <&dp0_connector_in>;
+};
+
+&mdss_dp0_phy {
+	vdda-phy-supply = <&vreg_l5a>;
+	vdda-pll-supply = <&vreg_l4a>;
+
+	status = "okay";
+};
+
 &qupv3_id_0 {
 	status = "okay";
 };
@@ -333,6 +369,12 @@ &serdes0 {
 };
 
 &tlmm {
+	dp_hot_plug_det: dp-hot-plug-det-state {
+		pins = "gpio94";
+		function = "edp0_hot";
+		bias-disable;
+	};
+
 	ethernet0_default: ethernet0-default-state {
 		ethernet0_mdc: ethernet0-mdc-pins {
 			pins = "gpio5";

-- 
2.34.1

Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

[Konrad Dybcio]

On 7/30/25 11:49 AM, Yongxing Mou wrote:
> Add devicetree changes to enable MDSS display-subsystem,
> display-controller(DPU), DisplayPort controller and eDP PHY for
> Qualcomm QCS8300 platform.
> 
> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
> ---

[...]

> +
> +				assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
> +				assigned-clock-rates = <19200000>;

is this necessary?

> +
> +				operating-points-v2 = <&mdp_opp_table>;
> +				power-domains = <&rpmhpd RPMHPD_MMCX>;
> +
> +				interrupt-parent = <&mdss>;
> +				interrupts = <0>;

interrupts-extended, file-wide

Konrad

Re: [PATCH v4 2/2] arm64: dts: qcom: qcs8300-ride: Enable Display Port

[Konrad Dybcio]

On 7/30/25 11:49 AM, Yongxing Mou wrote:
> Enable DPTX0 along with their corresponding PHYs for
> qcs8300-ride platform.
> 
> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
> ---

[...]

>  &tlmm {
> +	dp_hot_plug_det: dp-hot-plug-det-state {
> +		pins = "gpio94";

Please sort TLMM entries by the pin index

https://docs.kernel.org/devicetree/bindings/dts-coding-style.html

lgtm otherwise

Konrad

Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

[Yongxing Mou]

On 2025/7/30 18:25, Konrad Dybcio wrote:
> On 7/30/25 11:49 AM, Yongxing Mou wrote:
>> Add devicetree changes to enable MDSS display-subsystem,
>> display-controller(DPU), DisplayPort controller and eDP PHY for
>> Qualcomm QCS8300 platform.
>>
>> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
>> ---
> 
> [...]
> 
>> +
>> +				assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
>> +				assigned-clock-rates = <19200000>;
> 
> is this necessary?
> 
Emm, i try to remove assigned-clocks and assigned-clock-rates here, 
device can still work.. here we just want to keep consistent with sa8775p.
>> +
>> +				operating-points-v2 = <&mdp_opp_table>;
>> +				power-domains = <&rpmhpd RPMHPD_MMCX>;
>> +
>> +				interrupt-parent = <&mdss>;
>> +				interrupts = <0>;
> 
> interrupts-extended, file-wide
> 
> Konrad
Sure. thanks~

Re: [PATCH v4 2/2] arm64: dts: qcom: qcs8300-ride: Enable Display Port

[Yongxing Mou]

On 2025/7/30 20:55, Konrad Dybcio wrote:
> On 7/30/25 11:49 AM, Yongxing Mou wrote:
>> Enable DPTX0 along with their corresponding PHYs for
>> qcs8300-ride platform.
>>
>> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
>> ---
> 
> [...]
> 
>>   &tlmm {
>> +	dp_hot_plug_det: dp-hot-plug-det-state {
>> +		pins = "gpio94";
> 
> Please sort TLMM entries by the pin index
> 
> https://docs.kernel.org/devicetree/bindings/dts-coding-style.html
> 
> lgtm otherwise
> 
> Konrad
Acked, thanks.

Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

[Konrad Dybcio]

On 8/4/25 6:39 AM, Yongxing Mou wrote:
> 
> 
> On 2025/7/30 18:25, Konrad Dybcio wrote:
>> On 7/30/25 11:49 AM, Yongxing Mou wrote:
>>> Add devicetree changes to enable MDSS display-subsystem,
>>> display-controller(DPU), DisplayPort controller and eDP PHY for
>>> Qualcomm QCS8300 platform.
>>>
>>> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
>>> ---
>>
>> [...]
>>
>>> +
>>> +                assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
>>> +                assigned-clock-rates = <19200000>;
>>
>> is this necessary?
>>
> Emm, i try to remove assigned-clocks and assigned-clock-rates here, device can still work.. here we just want to keep consistent with sa8775p.

Dmitry, do you remember whether this is some relic of the past that
was required at one point?

The driver lists 19.2 as the only possible frequency for the source
of this branch

Konrad

Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

[Dmitry Baryshkov]

On Mon, Aug 04, 2025 at 02:34:56PM +0200, Konrad Dybcio wrote:
> On 8/4/25 6:39 AM, Yongxing Mou wrote:
> > 
> > 
> > On 2025/7/30 18:25, Konrad Dybcio wrote:
> >> On 7/30/25 11:49 AM, Yongxing Mou wrote:
> >>> Add devicetree changes to enable MDSS display-subsystem,
> >>> display-controller(DPU), DisplayPort controller and eDP PHY for
> >>> Qualcomm QCS8300 platform.
> >>>
> >>> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
> >>> ---
> >>
> >> [...]
> >>
> >>> +
> >>> +                assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
> >>> +                assigned-clock-rates = <19200000>;
> >>
> >> is this necessary?
> >>
> > Emm, i try to remove assigned-clocks and assigned-clock-rates here, device can still work.. here we just want to keep consistent with sa8775p.
> 
> Dmitry, do you remember whether this is some relic of the past that
> was required at one point?

I think it was necessary for old platforms (MSM8916, MSM8939, MSM8953,
APQ8084, MSM8974, MSM8992/94, MSM8996, MSM8998, SDM630/660), which can
source vsync_clk_src either from the XO or from the GPLL / MMPLL.

> 
> The driver lists 19.2 as the only possible frequency for the source
> of this branch

-- 
With best wishes
Dmitry

Re: [PATCH v4 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

[Konrad Dybcio]

On 8/5/25 7:15 AM, Dmitry Baryshkov wrote:
> On Mon, Aug 04, 2025 at 02:34:56PM +0200, Konrad Dybcio wrote:
>> On 8/4/25 6:39 AM, Yongxing Mou wrote:
>>>
>>>
>>> On 2025/7/30 18:25, Konrad Dybcio wrote:
>>>> On 7/30/25 11:49 AM, Yongxing Mou wrote:
>>>>> Add devicetree changes to enable MDSS display-subsystem,
>>>>> display-controller(DPU), DisplayPort controller and eDP PHY for
>>>>> Qualcomm QCS8300 platform.
>>>>>
>>>>> Signed-off-by: Yongxing Mou <quic_yongmou@quicinc.com>
>>>>> ---
>>>>
>>>> [...]
>>>>
>>>>> +
>>>>> +                assigned-clocks = <&dispcc MDSS_DISP_CC_MDSS_VSYNC_CLK>;
>>>>> +                assigned-clock-rates = <19200000>;
>>>>
>>>> is this necessary?
>>>>
>>> Emm, i try to remove assigned-clocks and assigned-clock-rates here, device can still work.. here we just want to keep consistent with sa8775p.
>>
>> Dmitry, do you remember whether this is some relic of the past that
>> was required at one point?
> 
> I think it was necessary for old platforms (MSM8916, MSM8939, MSM8953,
> APQ8084, MSM8974, MSM8992/94, MSM8996, MSM8998, SDM630/660), which can
> source vsync_clk_src either from the XO or from the GPLL / MMPLL.

The RCG has more than one input, but the Linux driver (checked about
half of the ones you listed) only lists the XO-derived frequency so I'm
not sure it was ever *really* an issue

Konrad