Re: [alsa-devel] [PATCH v3 2/4] ASoC: es8316: add clock control of MCLK

On Tue, Sep 3, 2019 at 7:54 PM Katsuhiro Suzuki katsuhiro@katsuster.net wrote:

This patch introduce clock property for MCLK master freq control. Driver will set rate of MCLK master if set_sysclk is called and changing sysclk by board driver.

Signed-off-by: Katsuhiro Suzuki katsuhiro@katsuster.net

•   if (es8316->mclk) {
  

You don't need this if clock has been requested as optional (clk_get_optional() or so).

•           ret = clk_set_rate(es8316->mclk, freq);
  

•           if (ret)
  

•                   return ret;
  

•   }
  

•   es8316->mclk = devm_clk_get(component->dev, "mclk");
  

•   if (PTR_ERR(es8316->mclk) == -EPROBE_DEFER)
  

•           return -EPROBE_DEFER;
  

•   if (IS_ERR(es8316->mclk)) {
  

•           dev_err(component->dev, "clock is invalid, ignored\n");
  

•           es8316->mclk = NULL;
  

•   }
  

devm_clk_get_optional()

•   if (es8316->mclk) {
  

Ditto as above.

•           ret = clk_prepare_enable(es8316->mclk);
  

•           if (ret) {
  

•                   dev_err(component->dev, "unable to enable clock\n");
  

•                   return ret;
  

•           }
  

•   }
  

•   if (es8316->mclk)
  

Ditto.

•           clk_disable_unprepare(es8316->mclk);
  

+}