Re: [PATCH] ASoC: fsl-asoc-card: Get "extal" clock rate by clk_get_rate

On Thu, Aug 06, 2020 at 03:39:45PM +0800, Shengjiu Wang wrote:

} else if (of_node_name_eq(cpu_np, "esai")) {

• struct clk *esai_clk = clk_get(&cpu_pdev->dev, "extal");
  

• if (!IS_ERR(esai_clk)) {
  

• 	priv->cpu_priv.sysclk_freq[TX] = clk_get_rate(esai_clk);
  

• 	priv->cpu_priv.sysclk_freq[RX] = clk_get_rate(esai_clk);
  

• 	clk_put(esai_clk);
  

• }
  

This should handle probe deferral. Also if this clock is in use shouldn't we be enabling it? It looks like it's intended to be a crystal so it's probably forced on all the time but sometimes there's power control for crystals, or perhaps someone might do something unusual with the hardware.