arm64: dts: amlogic: g12: bump spdif output drive strength

Spdif output currently uses a 0.5mA drive strength by default.
While the result depends on how the spdif output is hooked to
rest of the system, this is a bit weak and signal quality
may be poor. This was reported on the vim3l for example.

Increase the drive strength to 3mA, as used for TDM, to be on the
safe side.

Fixes: 649675db939d ("arm64: dts: meson: g12a: add spdifouts")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20240625115443.934763-1-jbrunet@baylibre.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
index 138fb18c648084ef64c5a6b235ca3bbfc8469bf1..4057ee808a582521b9b09efe56752ccdcd5da0e4 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
@@ -987,7 +987,7 @@
                                                mux {
                                                        groups = "spdif_out_h";
                                                        function = "spdif_out";
-                                                       drive-strength-microamp = <500>;
+                                                       drive-strength-microamp = <3000>;
                                                        bias-disable;
                                                };
                                        };
@@ -996,7 +996,7 @@
                                                mux {
                                                        groups = "spdif_out_a11";
                                                        function = "spdif_out";
-                                                       drive-strength-microamp = <500>;
+                                                       drive-strength-microamp = <3000>;
                                                        bias-disable;
                                                };
                                        };
@@ -1005,7 +1005,7 @@
                                                mux {
                                                        groups = "spdif_out_a13";
                                                        function = "spdif_out";
-                                                       drive-strength-microamp = <500>;
+                                                       drive-strength-microamp = <3000>;
                                                        bias-disable;
                                                };
                                        };
@@ -1826,7 +1826,7 @@
                                        mux {
                                                groups = "spdif_ao_out";
                                                function = "spdif_ao_out";
-                                               drive-strength-microamp = <500>;
+                                               drive-strength-microamp = <3000>;
                                                bias-disable;
                                        };
                                };