[PATCH v2] ASoC: fsl-asoc-card: Get "extal" clock rate by clk_get_rate

[Shengjiu Wang <shengjiu.wang@nxp.com>]

On some platform(.e.g. i.MX8QM MEK), the "extal" clock is different
with the mclk of codec, then the clock rate is also different.
So it is better to get clock rate of "extal" rate by clk_get_rate,
don't reuse the clock rate of mclk.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
changes in v2
- add defer probe handler

 sound/soc/fsl/fsl-asoc-card.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
index 52adedc03245..32f8f756e6bb 100644
--- a/sound/soc/fsl/fsl-asoc-card.c
+++ b/sound/soc/fsl/fsl-asoc-card.c
@@ -696,6 +696,17 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 			goto asrc_fail;
 		}
 	} 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);
+		} else if (PTR_ERR(esai_clk) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto asrc_fail;
+		}
+
 		priv->cpu_priv.sysclk_id[1] = ESAI_HCKT_EXTAL;
 		priv->cpu_priv.sysclk_id[0] = ESAI_HCKR_EXTAL;
 	} else if (of_node_name_eq(cpu_np, "sai")) {
-- 
2.27.0