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

[Mark Brown]

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.
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