ASoC: ti: omap-mcbsp: duplicate sysfs error

Convert to managed versions of sysfs and clk allocation to simplify
unbinding and error handling in probe.  Managed sysfs node
creation specifically addresses the following error seen the second time
probe is attempted after sdma_pcm_platform_register() previously requsted
probe deferral:

sysfs: cannot create duplicate filename '/devices/platform/68000000.ocp/49022000.mcbsp/max_tx_thres'

Signed-off-by: David Owens <dowens@precisionplanting.com>
Link: https://lore.kernel.org/r/20220620183744.3176557-1-dowens@precisionplanting.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: daowens01

sound/soc/ti/omap-mcbsp-priv.h

@@ -316,8 +316,6 @@ static inline int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg,
 
 /* Sidetone specific API */
 int omap_mcbsp_st_init(struct platform_device *pdev);
-void omap_mcbsp_st_cleanup(struct platform_device *pdev);
-
 int omap_mcbsp_st_start(struct omap_mcbsp *mcbsp);
 int omap_mcbsp_st_stop(struct omap_mcbsp *mcbsp);
 

sound/soc/ti/omap-mcbsp-st.c

@@ -347,7 +347,7 @@ int omap_mcbsp_st_init(struct platform_device *pdev)
 	if (!st_data)
 		return -ENOMEM;
 
-	st_data->mcbsp_iclk = clk_get(mcbsp->dev, "ick");
+	st_data->mcbsp_iclk = devm_clk_get(mcbsp->dev, "ick");
 	if (IS_ERR(st_data->mcbsp_iclk)) {
 		dev_warn(mcbsp->dev,
 			 "Failed to get ick, sidetone might be broken\n");
@@ -359,7 +359,7 @@ int omap_mcbsp_st_init(struct platform_device *pdev)
 	if (!st_data->io_base_st)
 		return -ENOMEM;
 
-	ret = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
+	ret = devm_device_add_group(mcbsp->dev, &sidetone_attr_group);
 	if (ret)
 		return ret;
 
@@ -368,16 +368,6 @@ int omap_mcbsp_st_init(struct platform_device *pdev)
 	return 0;
 }
 
-void omap_mcbsp_st_cleanup(struct platform_device *pdev)
-{
-	struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
-
-	if (mcbsp->st_data) {
-		sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
-		clk_put(mcbsp->st_data->mcbsp_iclk);
-	}
-}
-
 static int omap_mcbsp_st_info_volsw(struct snd_kcontrol *kcontrol,
 				    struct snd_ctl_elem_info *uinfo)
 {

sound/soc/ti/omap-mcbsp.c

@@ -702,25 +702,15 @@ static int omap_mcbsp_init(struct platform_device *pdev)
 		mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
 		mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
 
-		ret = sysfs_create_group(&mcbsp->dev->kobj,
-					 &additional_attr_group);
+		ret = devm_device_add_group(mcbsp->dev, &additional_attr_group);
 		if (ret) {
 			dev_err(mcbsp->dev,
 				"Unable to create additional controls\n");
 			return ret;
 		}
 	}
 
-	ret = omap_mcbsp_st_init(pdev);
-	if (ret)
-		goto err_st;
-
-	return 0;
-
-err_st:
-	if (mcbsp->pdata->buffer_size)
-		sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
-	return ret;
+	return omap_mcbsp_st_init(pdev);
 }
 
 /*
@@ -1431,11 +1421,6 @@ static int asoc_mcbsp_remove(struct platform_device *pdev)
 	if (cpu_latency_qos_request_active(&mcbsp->pm_qos_req))
 		cpu_latency_qos_remove_request(&mcbsp->pm_qos_req);
 
-	if (mcbsp->pdata->buffer_size)
-		sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
-
-	omap_mcbsp_st_cleanup(pdev);
-
 	return 0;
 }