From f42cc245e1f3e586f1a26550e5760489b6c329ab Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 23 Jul 2019 12:55:07 +0100 Subject: [PATCH] overlays: audremap: Support GPIOs 18 & 19 PWM audio can also be used on GPIOs 18 and 19, so add the pins_18_19 parameter to select that location. pins_12_13 explicitly chooses GPIOs 12 and 13, although this is the default behaviour so is there only for completeness. See: https://github.com/raspberrypi/firmware/issues/1178 Signed-off-by: Phil Elwell --- arch/arm/boot/dts/overlays/README | 4 +++- arch/arm/boot/dts/overlays/audremap-overlay.dts | 16 ++++++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-) --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -475,12 +475,14 @@ Params: Name: audremap -Info: Switches PWM sound output to pins 12 (Right) & 13 (Left) +Info: Switches PWM sound output to GPIOs on the 40-pin header Load: dtoverlay=audremap,= Params: swap_lr Reverse the channel allocation, which will also swap the audio jack outputs (default off) enable_jack Don't switch off the audio jack output (default off) + pins_12_13 Select GPIOs 12 & 13 (default) + pins_18_19 Select GPIOs 18 & 19 Name: balena-fin --- a/arch/arm/boot/dts/overlays/audremap-overlay.dts +++ b/arch/arm/boot/dts/overlays/audremap-overlay.dts @@ -7,13 +7,29 @@ fragment@0 { target = <&audio_pins>; frag0: __overlay__ { + }; + }; + + fragment@1 { + target = <&audio_pins>; + __overlay__ { brcm,pins = < 12 13 >; brcm,function = < 4 >; /* alt0 alt0 */ }; }; + fragment@2 { + target = <&audio_pins>; + __dormant__ { + brcm,pins = < 18 19 >; + brcm,function = < 2 >; /* alt5 alt5 */ + }; + }; + __overrides__ { swap_lr = <&frag0>, "swap_lr?"; enable_jack = <&frag0>, "enable_jack?"; + pins_12_13 = <0>,"+1-2"; + pins_18_19 = <0>,"-1+2"; }; };