2019-09-19 14:43:19 +00:00
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From f42cc245e1f3e586f1a26550e5760489b6c329ab Mon Sep 17 00:00:00 2001
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2019-07-31 16:23:26 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 23 Jul 2019 12:55:07 +0100
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] overlays: audremap: Support GPIOs 18 & 19
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2019-07-31 16:23:26 +00:00
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PWM audio can also be used on GPIOs 18 and 19, so add the pins_18_19
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parameter to select that location. pins_12_13 explicitly chooses GPIOs
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12 and 13, although this is the default behaviour so is there only for
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completeness.
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See: https://github.com/raspberrypi/firmware/issues/1178
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/README | 4 +++-
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arch/arm/boot/dts/overlays/audremap-overlay.dts | 16 ++++++++++++++++
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2 files changed, 19 insertions(+), 1 deletion(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -475,12 +475,14 @@ Params: <None>
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Name: audremap
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-Info: Switches PWM sound output to pins 12 (Right) & 13 (Left)
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+Info: Switches PWM sound output to GPIOs on the 40-pin header
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Load: dtoverlay=audremap,<param>=<val>
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Params: swap_lr Reverse the channel allocation, which will also
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swap the audio jack outputs (default off)
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enable_jack Don't switch off the audio jack output
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(default off)
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+ pins_12_13 Select GPIOs 12 & 13 (default)
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+ pins_18_19 Select GPIOs 18 & 19
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Name: balena-fin
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--- a/arch/arm/boot/dts/overlays/audremap-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/audremap-overlay.dts
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@@ -7,13 +7,29 @@
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fragment@0 {
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target = <&audio_pins>;
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frag0: __overlay__ {
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&audio_pins>;
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+ __overlay__ {
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brcm,pins = < 12 13 >;
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brcm,function = < 4 >; /* alt0 alt0 */
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};
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};
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+ fragment@2 {
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+ target = <&audio_pins>;
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+ __dormant__ {
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+ brcm,pins = < 18 19 >;
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+ brcm,function = < 2 >; /* alt5 alt5 */
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+ };
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+ };
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+
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__overrides__ {
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swap_lr = <&frag0>, "swap_lr?";
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enable_jack = <&frag0>, "enable_jack?";
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+ pins_12_13 = <0>,"+1-2";
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+ pins_18_19 = <0>,"-1+2";
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};
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};
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