Hi all,
We're looking into using the generic simple-card.c driver to glue together WM8510 codec driver and Atmel SSC platform driver without a specific machine code.
It turned out that the DTS configuration below fails to set the codec PLL and clkdiv values. In fact, wm8510_set_dai_pll() and wm8510_set_dai_clkdiv() get never called.
After adding following lines (omitting determination of myboard_* values) into wm8510_pcm_hw_params(), the audio starts working properly:
wm8510_set_dai_clkdiv(dai, WM8510_BCLKDIV, myboard_bclk_div);
wm8510_set_dai_pll(dai, 0, 0, 12000000, myboard_pll_out);
wm8510_set_dai_clkdiv(dai, WM8510_MCLKDIV, myboard_mclk_div);
What is actually the missing part? Did we forget to configure something in DTS?
Or is this a limitation of simple-card driver? If so, what would be the proper way to implement the missing features?
We're using Linux v4.14-rc1. The codec clock comes from a constantly running 12 MHz oscillator, and the codec is the clock and frame master.
DTS configuration is as follows:
ahb {
apb {
ssc0: ssc@fff9c000 {
#sound-dai-cells = <0>;
status = "okay";
dmas = <&dma 1 AT91_DMA_CFG_PER_ID(5)>,
<&dma 1 AT91_DMA_CFG_PER_ID(6)>;
dma-names = "tx", "rx";
pinctrl-0 = <&pinctrl_ssc0_tx &pinctrl_ssc0_rx>;
};
spi0: spi@fffa4000{
status = "okay";
cs-gpios = <&pioB 3 0>, <&pioA 28 0>, <0>, <0>;
audio_codec: wm8510@1 {
#sound-dai-cells = <0>;
compatible = "wlf,wm8510";
spi-max-frequency = <2000000>;
reg = <1>;
};
};
};
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "wm8510_WID";
simple-audio-card,format = "i2s";
simple-audio-card,routing = "Mono Out", "MONOOUT";
simple-audio-card,codec {
sound-dai = <&audio_codec>;
system-clock-frequency = <12000000>;
bitclock-master;
frame-master;
};
simple-audio-card,cpu {
sound-dai = <&ssc0>;
};
};
-Jukka
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