OMAP3+: voltage: remove unneeded debugfs interface

Remove read-only debugfs interface to VP values.  Most of the values
are init-time only and never change.  Current voltage value should be
retreived from the (eventual) regulator framework interface to the
voltage domain.

Fixes to original version provided by Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/smartreflex.c

@@ -62,6 +62,7 @@ static LIST_HEAD(sr_list);
 
 static struct omap_sr_class_data *sr_class;
 static struct omap_sr_pmic_data *sr_pmic_data;
+static struct dentry		*sr_dbg_dir;
 
 static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)
 {
@@ -826,9 +827,10 @@ static int __init omap_sr_probe(struct platform_device *pdev)
 	struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
 	struct omap_sr_data *pdata = pdev->dev.platform_data;
 	struct resource *mem, *irq;
-	struct dentry *vdd_dbg_dir, *nvalue_dir;
+	struct dentry *nvalue_dir;
 	struct omap_volt_data *volt_data;
 	int i, ret = 0;
+	char *name;
 
 	if (!sr_info) {
 		dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
@@ -899,18 +901,25 @@ static int __init omap_sr_probe(struct platform_device *pdev)
 	}
 
 	dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);
-
-	/*
-	 * If the voltage domain debugfs directory is not created, do
-	 * not try to create rest of the debugfs entries.
-	 */
-	vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm);
-	if (!vdd_dbg_dir) {
-		ret = -EINVAL;
+	if (!sr_dbg_dir) {
+		sr_dbg_dir = debugfs_create_dir("smartreflex", NULL);
+		if (!sr_dbg_dir) {
+			ret = PTR_ERR(sr_dbg_dir);
+			pr_err("%s:sr debugfs dir creation failed(%d)\n",
+				__func__, ret);
 			goto err_iounmap;
 		}
+	}
 
-	sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir);
+	name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name);
+	if (!name) {
+		dev_err(&pdev->dev, "%s: Unable to alloc debugfs name\n",
+			__func__);
+		ret = -ENOMEM;
+		goto err_iounmap;
+	}
+	sr_info->dbg_dir = debugfs_create_dir(name, sr_dbg_dir);
+	kfree(name);
 	if (IS_ERR(sr_info->dbg_dir)) {
 		dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n",
 			__func__);

arch/arm/mach-omap2/voltage.c

@@ -43,9 +43,6 @@
 
 static LIST_HEAD(voltdm_list);
 
-#define VOLTAGE_DIR_SIZE	16
-static struct dentry *voltage_dir;
-
 static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
 {
 	char *sys_ck_name;
@@ -102,51 +99,6 @@ static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
 	return 0;
 }
 
-static int nom_volt_debug_get(void *data, u64 *val)
-{
-	struct voltagedomain *voltdm = (struct voltagedomain *)data;
-
-	if (!voltdm) {
-		pr_warning("Wrong paramater passed\n");
-		return -EINVAL;
-	}
-
-	*val = omap_voltage_get_nom_volt(voltdm);
-
-	return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL,
-								"%llu\n");
-static void __init vdd_debugfs_init(struct voltagedomain *voltdm)
-{
-	char *name;
-	struct omap_vdd_info *vdd = voltdm->vdd;
-
-	name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL);
-	if (!name) {
-		pr_warning("%s: Unable to allocate memory for debugfs"
-			" directory name for vdd_%s",
-			__func__, voltdm->name);
-		return;
-	}
-	strcpy(name, "vdd_");
-	strcat(name, voltdm->name);
-
-	vdd->debug_dir = debugfs_create_dir(name, voltage_dir);
-	kfree(name);
-	if (IS_ERR(vdd->debug_dir)) {
-		pr_warning("%s: Unable to create debugfs directory for"
-			" vdd_%s\n", __func__, voltdm->name);
-		vdd->debug_dir = NULL;
-		return;
-	}
-
-	(void) debugfs_create_file("curr_nominal_volt", S_IRUGO,
-				vdd->debug_dir, (void *) voltdm,
-				&nom_volt_debug_fops);
-}
-
 static int __init omap_vdd_data_configure(struct voltagedomain *voltdm)
 {
 	int ret = -EINVAL;
@@ -341,31 +293,6 @@ int omap_voltage_register_pmic(struct voltagedomain *voltdm,
 	return 0;
 }
 
-/**
- * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory
- *				corresponding to a voltage domain.
- *
- * @voltdm:	pointer to the VDD whose debug directory is required.
- *
- * This API returns pointer to the debugfs directory corresponding
- * to the voltage domain. Should be used by drivers requiring to
- * add any debug entry for a particular voltage domain. Returns NULL
- * in case of error.
- */
-struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm)
-{
-	struct omap_vdd_info *vdd;
-
-	if (!voltdm || IS_ERR(voltdm)) {
-		pr_warning("%s: VDD specified does not exist!\n", __func__);
-		return NULL;
-	}
-
-	vdd = voltdm->vdd;
-
-	return vdd->debug_dir;
-}
-
 /**
  * omap_change_voltscale_method() - API to change the voltage scaling method.
  * @voltdm:	pointer to the VDD whose voltage scaling method
@@ -418,10 +345,6 @@ int __init omap_voltage_late_init(void)
 		return -EINVAL;
 	}
 
-	voltage_dir = debugfs_create_dir("voltage", NULL);
-	if (IS_ERR(voltage_dir))
-		pr_err("%s: Unable to create voltage debugfs main dir\n",
-			__func__);
 	list_for_each_entry(voltdm, &voltdm_list, node) {
 		if (!voltdm->scalable)
 			continue;
@@ -434,7 +357,6 @@ int __init omap_voltage_late_init(void)
 		if (voltdm->vdd) {
 			if (omap_vdd_data_configure(voltdm))
 				continue;
-			vdd_debugfs_init(voltdm);
 			omap_vp_init(voltdm);
 		}
 	}

arch/arm/mach-omap2/voltage.h

@@ -139,14 +139,12 @@ struct omap_voltdm_pmic {
  * @volt_data		: voltage table having the distinct voltages supported
  *			  by the domain and other associated per voltage data.
  * @vp_rt_data          : VP data derived at runtime, not predefined
- * @debug_dir		: debug directory for this voltage domain.
  * @curr_volt		: current voltage for this vdd.
  * @volt_scale		: API to scale the voltage of the vdd.
  */
 struct omap_vdd_info {
 	struct omap_volt_data *volt_data;
 	struct omap_vp_runtime_data vp_rt_data;
-	struct dentry *debug_dir;
 	u32 curr_volt;
 
 	int (*volt_scale) (struct voltagedomain *voltdm,
@@ -161,7 +159,6 @@ void omap_voltage_get_volttable(struct voltagedomain *voltdm,
 struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
 		unsigned long volt);
 unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm);
-struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm);
 #ifdef CONFIG_PM
 int omap_voltage_register_pmic(struct voltagedomain *voltdm,
 			       struct omap_voltdm_pmic *pmic);

arch/arm/mach-omap2/vp.c

 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/debugfs.h>
 
 #include <plat/common.h>
 
@@ -10,8 +9,6 @@
 #include "prm-regbits-44xx.h"
 #include "prm44xx.h"
 
-static void __init vp_debugfs_init(struct voltagedomain *voltdm);
-
 static void vp_latch_vsel(struct voltagedomain *voltdm)
 {
 	struct omap_vp_instance *vp = voltdm->vp;
@@ -87,8 +84,6 @@ void __init omap_vp_init(struct voltagedomain *voltdm)
 		(vdd->vp_rt_data.vlimitto_timeout <<
 		vp->common->vlimitto_timeout_shift));
 	voltdm->write(vp_val, vp->vlimitto);
-
-	vp_debugfs_init(voltdm);
 }
 
 /* VP force update method of voltage scaling */
@@ -300,61 +295,3 @@ void omap_vp_disable(struct voltagedomain *voltdm)
 
 	return;
 }
-
-/* Voltage debugfs support */
-static int vp_volt_debug_get(void *data, u64 *val)
-{
-	struct voltagedomain *voltdm = (struct voltagedomain *)data;
-	struct omap_vp_instance *vp = voltdm->vp;
-	struct omap_vdd_info *vdd = voltdm->vdd;
-	u8 vsel;
-
-	if (!vdd) {
-		pr_warning("Wrong paramater passed\n");
-		return -EINVAL;
-	}
-
-	vsel = voltdm->read(vp->voltage);
-
-	if (!voltdm->pmic->vsel_to_uv) {
-		pr_warning("PMIC function to convert vsel to voltage"
-			"in uV not registerd\n");
-		return -EINVAL;
-	}
-
-	*val = voltdm->pmic->vsel_to_uv(vsel);
-	return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n");
-
-static void __init vp_debugfs_init(struct voltagedomain *voltdm)
-{
-	struct omap_vdd_info *vdd = voltdm->vdd;
-	struct dentry *debug_dir;
-
-	debug_dir = debugfs_create_dir("vp", vdd->debug_dir);
-	if (IS_ERR(debug_dir))
-		pr_err("%s: Unable to create VP debugfs dir dir\n", __func__);
-
-	(void) debugfs_create_x16("errorgain", S_IRUGO, debug_dir,
-				&(vdd->vp_rt_data.vpconfig_errorgain));
-	(void) debugfs_create_x16("smpswaittimemin", S_IRUGO,
-				debug_dir,
-				&(vdd->vp_rt_data.vstepmin_smpswaittimemin));
-	(void) debugfs_create_x8("stepmin", S_IRUGO, debug_dir,
-				&(vdd->vp_rt_data.vstepmin_stepmin));
-	(void) debugfs_create_x16("smpswaittimemax", S_IRUGO,
-				debug_dir,
-				&(vdd->vp_rt_data.vstepmax_smpswaittimemax));
-	(void) debugfs_create_x8("stepmax", S_IRUGO, debug_dir,
-				&(vdd->vp_rt_data.vstepmax_stepmax));
-	(void) debugfs_create_x8("vddmax", S_IRUGO, debug_dir,
-				&(vdd->vp_rt_data.vlimitto_vddmax));
-	(void) debugfs_create_x8("vddmin", S_IRUGO, debug_dir,
-				&(vdd->vp_rt_data.vlimitto_vddmin));
-	(void) debugfs_create_x16("timeout", S_IRUGO, debug_dir,
-				&(vdd->vp_rt_data.vlimitto_timeout));
-	(void) debugfs_create_file("curr_volt", S_IRUGO, debug_dir,
-				(void *) voltdm, &vp_volt_debug_fops);
-}