Add HDMI tx and phy nodes to support an external display that can be
connected over the SlimPort. This is based on work from Jonathan Marek.

Signed-off-by: Brian Masney <masn...@onstation.org>
---
The hdmi-tx node in the downstream MSM sources:
https://github.com/AICP/kernel_lge_hammerhead/blob/n7.1/arch/arm/boot/dts/msm8974-mdss.dtsi#L101

 arch/arm/boot/dts/qcom-msm8974.dtsi | 80 +++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi 
b/arch/arm/boot/dts/qcom-msm8974.dtsi
index 369e58f64145..35c51336a9d4 100644
--- a/arch/arm/boot/dts/qcom-msm8974.dtsi
+++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
@@ -1139,6 +1139,13 @@
 
                                        port@0 {
                                                reg = <0>;
+                                               mdp5_intf3_out: endpoint {
+                                                       remote-endpoint = 
<&hdmi_in>;
+                                               };
+                                       };
+
+                                       port@1 {
+                                               reg = <1>;
                                                mdp5_intf1_out: endpoint {
                                                        remote-endpoint = 
<&dsi0_in>;
                                                };
@@ -1216,6 +1223,79 @@
                                clocks = <&mmcc MDSS_AHB_CLK>;
                                clock-names = "iface";
                        };
+
+                       hdmi: hdmi-tx@fd922100 {
+                               status = "disabled";
+
+                               compatible = "qcom,hdmi-tx-8974";
+                               reg = <0xfd922100 0x35c>,
+                                     <0xfc4b8000 0x60f0>;
+                               reg-names = "core_physical",
+                                           "qfprom_physical";
+
+                               interrupt-parent = <&mdss>;
+                               interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
+
+                               power-domains = <&mmcc MDSS_GDSC>;
+
+                               clocks = <&mmcc MDSS_MDP_CLK>,
+                                        <&mmcc MDSS_AHB_CLK>,
+                                        <&mmcc MDSS_HDMI_CLK>,
+                                        <&mmcc MDSS_HDMI_AHB_CLK>,
+                                        <&mmcc MDSS_EXTPCLK_CLK>;
+                               clock-names = "mdp_core",
+                                             "iface",
+                                             "core",
+                                             "alt_iface",
+                                             "extp";
+
+                               hpd-5v-supply = <&pm8941_5vs2>;
+                               core-vdda-supply = <&pm8941_l12>;
+                               core-vcc-supply = <&pm8941_s3>;
+
+                               /*
+                                * FIXME - drivers/gpu/drm/msm/hdmi/hdmi.c via 
hpd_reg_names_8x74
+                                * looks for hpd-gdsc-supply. What should be 
used here? Shouldn't
+                                * this functionality be provided by the 
power-domains above?
+                                */
+
+                               phys = <&hdmi_phy>;
+                               phy-names = "hdmi_phy";
+
+                               ports {
+                                       #address-cells = <1>;
+                                       #size-cells = <0>;
+
+                                       port@0 {
+                                               reg = <0>;
+                                               hdmi_in: endpoint {
+                                                       remote-endpoint = 
<&mdp5_intf3_out>;
+                                               };
+                                       };
+
+                                       port@1 {
+                                               reg = <1>;
+                                       };
+                               };
+                       };
+
+                       hdmi_phy: hdmi-phy@fd922500 {
+                               status = "disabled";
+
+                               compatible = "qcom,hdmi-phy-8974";
+                               reg = <0xfd922500 0x7c>;
+                               reg-names = "hdmi_phy";
+
+                               clocks = <&mmcc MDSS_AHB_CLK>,
+                                        <&mmcc MDSS_HDMI_AHB_CLK>;
+                               clock-names = "iface",
+                                             "alt_iface";
+
+                               core-vdda-supply = <&pm8941_l12>;
+                               vddio-supply = <&pm8941_s3>;
+
+                               #phy-cells = <0>;
+                       };
                };
        };
 
-- 
2.21.0

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