ARM: dts: rockchip: Add unwedge pinctrl entries for dw_hdmi on rk3288

This adds the "unwedge" pinctrl entries introduced by a recent dw_hdmi
change that can unwedge the dw_hdmi i2c bus in some cases.  It's
expected that any boards using this would add:

  pinctrl-names = "default", "unwedge";
  pinctrl-0 = <&hdmi_ddc>;
  pinctrl-1 = <&hdmi_ddc_unwedge>;

Note that this isn't added by default because some boards may choose
to mux i2c5 for their DDC bus (if that is more tested for them).

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index 766d1cf..cc893e1 100644 (file)
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -1547,6 +1547,15 @@
                                rockchip,pins = <7 RK_PC3 2 &pcfg_pull_none>,
                                                <7 RK_PC4 2 &pcfg_pull_none>;
                        };
+
+                       hdmi_ddc_unwedge: hdmi-ddc-unwedge {
+                               rockchip,pins = <7 RK_PC3 RK_FUNC_GPIO &pcfg_output_low>,
+                                               <7 RK_PC4 2 &pcfg_pull_none>;
+                       };
+               };
+
+               pcfg_output_low: pcfg-output-low {
+                       output-low;
                };
 
                pcfg_pull_up: pcfg-pull-up {