linux-kernel - [PATCH] arm64: dts: amlogic: g12: bump spdif output drive strength

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Date: Tue, 25 Jun 2024 13:54:41 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Jerome Brunet <jbrunet@...libre.com>,
	Kevin Hilman <khilman@...libre.com>,
	linux-kernel@...r.kernel.org,
	linux-amlogic@...ts.infradead.org,
	devicetree@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Subject: [PATCH] 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@...libre.com>
---
 arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
index 138fb18c6480..4057ee808a58 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
@@ -987,7 +987,7 @@ spdif_out_h_pins: spdif-out-h {
 						mux {
 							groups = "spdif_out_h";
 							function = "spdif_out";
-							drive-strength-microamp = <500>;
+							drive-strength-microamp = <3000>;
 							bias-disable;
 						};
 					};
@@ -996,7 +996,7 @@ spdif_out_a11_pins: spdif-out-a11 {
 						mux {
 							groups = "spdif_out_a11";
 							function = "spdif_out";
-							drive-strength-microamp = <500>;
+							drive-strength-microamp = <3000>;
 							bias-disable;
 						};
 					};
@@ -1005,7 +1005,7 @@ spdif_out_a13_pins: spdif-out-a13 {
 						mux {
 							groups = "spdif_out_a13";
 							function = "spdif_out";
-							drive-strength-microamp = <500>;
+							drive-strength-microamp = <3000>;
 							bias-disable;
 						};
 					};
@@ -1826,7 +1826,7 @@ spdif_ao_out_pins: spdif-ao-out {
 					mux {
 						groups = "spdif_ao_out";
 						function = "spdif_ao_out";
-						drive-strength-microamp = <500>;
+						drive-strength-microamp = <3000>;
 						bias-disable;
 					};
 				};
-- 
2.43.0