1. 05 Oct, 2020 1 commit
    • Samuel Holland's avatar
      ASoC: sun8i-codec: Set up clock tree at probe time · d8f00682
      Samuel Holland authored
      The sun8i codec is effectively an on-die variant of the X-Powers AC100
      codec. The AC100 can derive its clocks from either of two I2S master
      clocks or an internal PLL. For the on-die variant, Allwinner replaced
      the codec's own PLL with a connection to SoC's existing PLL_AUDIO, and
      they connected both I2S MCLK inputs to the same source -- which happens
      to be an integer divider from the same PLL_AUDIO.
      
      So there's actually no clocking flexibility. To run SYSCLK at the
      required rate, it must be run straight from the PLL. The only choice is
      whether it goes through AIF1CLK or AIF2CLK. Since both run at the same
      rate, the only effect of that choice is which field in SYS_SR_CTRL
      (AIF1_FS or AIF2_FS) controls the system sample rate.
      
      Since AIFnCLK is required to bring up the corresponding DAI, and AIF1
      (connected to the CPU) is used most often, let's use AIF1CLK as the
      SYSCLK parent. That means we no longer need to set AIF2_FS.
      
      Since this clock tree never changes, we can program it from the
      component probe function, instead of using DAPM widgets. The DAPM
      widgets unnecessarily change clock parents when the codec goes in/out
      of idle and the supply widgets are powered up/down.
      Signed-off-by: default avatarSamuel Holland <samuel@sholland.org>
      Acked-by: default avatarMaxime Ripard <mripard@kernel.org>
      Link: https://lore.kernel.org/r/20201001021148.15852-2-samuel@sholland.orgSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      d8f00682
  2. 02 Oct, 2020 22 commits
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  4. 30 Sep, 2020 3 commits
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