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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0369-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0369-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch83
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0369-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch b/target/linux/brcm2708/patches-4.4/0369-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch
new file mode 100644
index 0000000000..920199fea7
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0369-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch
@@ -0,0 +1,83 @@
+From e4183dfba92b3adf88a9be7e073cf80c5bda2c69 Mon Sep 17 00:00:00 2001
+From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
+Date: Sun, 29 May 2016 05:22:29 +0100
+Subject: [PATCH 369/423] Add dt param to force HiFiBerry DAC+ Pro into slave
+ mode
+
+"dtoverlay=hifiberry-dacplus,slave"
+
+Add 'slave' param to use HiFiBerry DAC+ Pro in slave mode,
+with Pi as master for bit and frame clock.
+
+Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
+---
+ arch/arm/boot/dts/overlays/README | 2 ++
+ arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts | 6 ++++--
+ sound/soc/bcm/hifiberry_dacplus.c | 10 ++++++++--
+ 3 files changed, 14 insertions(+), 4 deletions(-)
+
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -344,6 +344,8 @@ Params: 24db_digital_gain Allow ga
+ responsibility of the user to ensure that
+ the Digital volume control is set to a value
+ that does not result in clipping/distortion!)
++ slave Force DAC+ Pro into slave mode, using Pi as
++ master for bit clock and frame clock.
+
+
+ Name: hifiberry-digi
+--- a/arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts
++++ b/arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts
+@@ -41,7 +41,7 @@
+
+ fragment@3 {
+ target = <&sound>;
+- frag3: __overlay__ {
++ hifiberry_dacplus: __overlay__ {
+ compatible = "hifiberry,hifiberry-dacplus";
+ i2s-controller = <&i2s>;
+ status = "okay";
+@@ -49,6 +49,8 @@
+ };
+
+ __overrides__ {
+- 24db_digital_gain = <&frag3>,"hifiberry,24db_digital_gain?";
++ 24db_digital_gain =
++ <&hifiberry_dacplus>,"hifiberry,24db_digital_gain?";
++ slave = <&hifiberry_dacplus>,"hifiberry-dacplus,slave?";
+ };
+ };
+--- a/sound/soc/bcm/hifiberry_dacplus.c
++++ b/sound/soc/bcm/hifiberry_dacplus.c
+@@ -47,6 +47,7 @@ struct pcm512x_priv {
+ /* Clock rate of CLK48EN attached to GPIO3 pin */
+ #define CLK_48EN_RATE 24576000UL
+
++static bool slave;
+ static bool snd_rpi_hifiberry_is_dacpro;
+ static bool digital_gain_0db_limit = true;
+
+@@ -145,8 +146,11 @@ static int snd_rpi_hifiberry_dacplus_ini
+ struct snd_soc_codec *codec = rtd->codec;
+ struct pcm512x_priv *priv;
+
+- snd_rpi_hifiberry_is_dacpro
+- = snd_rpi_hifiberry_dacplus_is_pro_card(codec);
++ if (slave)
++ snd_rpi_hifiberry_is_dacpro = false;
++ else
++ snd_rpi_hifiberry_is_dacpro =
++ snd_rpi_hifiberry_dacplus_is_pro_card(codec);
+
+ if (snd_rpi_hifiberry_is_dacpro) {
+ struct snd_soc_dai_link *dai = rtd->dai_link;
+@@ -314,6 +318,8 @@ static int snd_rpi_hifiberry_dacplus_pro
+
+ digital_gain_0db_limit = !of_property_read_bool(
+ pdev->dev.of_node, "hifiberry,24db_digital_gain");
++ slave = of_property_read_bool(pdev->dev.of_node,
++ "hifiberry-dacplus,slave");
+ }
+
+ ret = snd_soc_register_card(&snd_rpi_hifiberry_dacplus);