MLK-23618-9: ASoC: fsl_sai: Don't bind clock with regmap

The call flow:
devm_regmap_init_mmio_clk
   - clk_prepare()
      - clk_pm_runtime_get()

Cause the power domain of lpcg clock always be enabled.
which impact the power consumption.

So we can't bind clock with regmap, then explicitly enable
clock when using. As we already enable all clock in
pm_runtime_resume, so only need to enable clock in probe.

Signed-off-by: Shengjiu Wang <[email protected]>
Reviewed-by: Daniel Baluta <[email protected]>

Author: TE-N-ShengjiuWang

sound/soc/fsl/fsl_sai.c

@@ -1460,12 +1460,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
 		fsl_sai_regmap_config = fsl_sai_v3_regmap_config;
 
 	sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
-			"bus", base, &fsl_sai_regmap_config);
-
-	/* Compatible with old DTB cases */
-	if (IS_ERR(sai->regmap) && PTR_ERR(sai->regmap) != -EPROBE_DEFER)
-		sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
-				"sai", base, &fsl_sai_regmap_config);
+			NULL, base, &fsl_sai_regmap_config);
 	if (IS_ERR(sai->regmap)) {
 		dev_err(&pdev->dev, "regmap init failed\n");
 		return PTR_ERR(sai->regmap);
@@ -1574,6 +1569,11 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, sai);
+
+	ret = clk_prepare_enable(sai->bus_clk);
+	if (ret)
+		return ret;
+
 	ret = fsl_sai_check_ver(&pdev->dev);
 	if (ret < 0)
 		dev_warn(&pdev->dev, "Error reading SAI version: %d\n", ret);
@@ -1600,6 +1600,8 @@ static int fsl_sai_probe(struct platform_device *pdev)
 				   FSL_SAI_MCTL_MCLK_EN, FSL_SAI_MCTL_MCLK_EN);
 	}
 
+	clk_disable_unprepare(sai->bus_clk);
+
 	sai->dma_params_rx.chan_name = "rx";
 	sai->dma_params_tx.chan_name = "tx";
 	sai->dma_params_rx.addr = res->start + FSL_SAI_RDR0;