diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0368-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0368-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0368-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch b/target/linux/brcm2708/patches-4.4/0368-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch new file mode 100644 index 0000000000..11019f2bbc --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0368-Add-dt-param-to-force-HiFiBerry-DAC-Pro-into-slave-m.patch @@ -0,0 +1,82 @@ +From 23a2a66f68d9cef1664e904b741e074dab5b82d6 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] 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); |