From f086ba9d5389cc9a309958c9e7c92460f1cfca5e Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Wed, 28 Jan 2015 15:16:10 +0100 Subject: ASoC: pcm512x: Support mastering BCLK/LRCLK using the PLL Using the PLL in master mode requires using an external connection between one of the GPIO pins (configured as PLL/4 output) and the SCK pin. It also requires the external clock to be fed to some other GPIO pin instead of the SCK pin. This is described for the PCM5122 chip in the answers to the forum post "PCM5122 DAC as I2S master troubles with PLL mode" at the TI E2E community pages (1). The clocking functionality is also much better described in the datasheet for the chip PCM5242, which seems to be register compatible with PCM512x and PCM514x (which both have severely lacking datasheets). (1) http://e2e.ti.com/support/data_converters/audio_converters/f/64/t/267830 Signed-off-by: Peter Rosin Signed-off-by: Mark Brown --- .../devicetree/bindings/sound/pcm512x.txt | 25 ++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/sound/pcm512x.txt b/Documentation/devicetree/bindings/sound/pcm512x.txt index 98e0d34915e8..3aae3b41bd8e 100644 --- a/Documentation/devicetree/bindings/sound/pcm512x.txt +++ b/Documentation/devicetree/bindings/sound/pcm512x.txt @@ -17,9 +17,16 @@ Required properties: Optional properties: - clocks : A clock specifier for the clock connected as SCLK. If this - is absent the device will be configured to clock from BCLK. + is absent the device will be configured to clock from BCLK. If pll-in + and pll-out are specified in addition to a clock, the device is + configured to accept clock input on a specified gpio pin. -Example: + - pll-in, pll-out : gpio pins used to connect the pll using <1> + through <6>. The device will be configured for clock input on the + given pll-in pin and PLL output on the given pll-out pin. An + external connection from the pll-out pin to the SCLK pin is assumed. + +Examples: pcm5122: pcm5122@4c { compatible = "ti,pcm5122"; @@ -29,3 +36,17 @@ Example: DVDD-supply = <®_1v8>; CPVDD-supply = <®_3v3>; }; + + + pcm5142: pcm5142@4c { + compatible = "ti,pcm5142"; + reg = <0x4c>; + + AVDD-supply = <®_3v3_analog>; + DVDD-supply = <®_1v8>; + CPVDD-supply = <®_3v3>; + + clocks = <&sck>; + pll-in = <3>; + pll-out = <6>; + }; -- cgit v1.2.2