Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 659 insertions, 0 deletions

diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.c b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
new file mode 100644
index 000000000..7e0ebf11a
--- /dev/null
+++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
@@ -0,0 +1,659 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 IBM Corp.
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include "../core.h"
+#include "pinctrl-aspeed.h"
+
+int aspeed_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pinmux.ngroups;
+}
+
+const char *aspeed_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+		unsigned int group)
+{
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pinmux.groups[group].name;
+}
+
+int aspeed_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+				  unsigned int group, const unsigned int **pins,
+				  unsigned int *npins)
+{
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = &pdata->pinmux.groups[group].pins[0];
+	*npins = pdata->pinmux.groups[group].npins;
+
+	return 0;
+}
+
+void aspeed_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+				 struct seq_file *s, unsigned int offset)
+{
+	seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+
+int aspeed_pinmux_get_fn_count(struct pinctrl_dev *pctldev)
+{
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pinmux.nfunctions;
+}
+
+const char *aspeed_pinmux_get_fn_name(struct pinctrl_dev *pctldev,
+				      unsigned int function)
+{
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pinmux.functions[function].name;
+}
+
+int aspeed_pinmux_get_fn_groups(struct pinctrl_dev *pctldev,
+				unsigned int function,
+				const char * const **groups,
+				unsigned int * const num_groups)
+{
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pdata->pinmux.functions[function].groups;
+	*num_groups = pdata->pinmux.functions[function].ngroups;
+
+	return 0;
+}
+
+static int aspeed_sig_expr_enable(struct aspeed_pinmux_data *ctx,
+				  const struct aspeed_sig_expr *expr)
+{
+	int ret;
+
+	pr_debug("Enabling signal %s for %s\n", expr->signal,
+		 expr->function);
+
+	ret = aspeed_sig_expr_eval(ctx, expr, true);
+	if (ret < 0)
+		return ret;
+
+	if (!ret)
+		return aspeed_sig_expr_set(ctx, expr, true);
+
+	return 0;
+}
+
+static int aspeed_sig_expr_disable(struct aspeed_pinmux_data *ctx,
+				   const struct aspeed_sig_expr *expr)
+{
+	int ret;
+
+	pr_debug("Disabling signal %s for %s\n", expr->signal,
+		 expr->function);
+
+	ret = aspeed_sig_expr_eval(ctx, expr, true);
+	if (ret < 0)
+		return ret;
+
+	if (ret)
+		return aspeed_sig_expr_set(ctx, expr, false);
+
+	return 0;
+}
+
+/**
+ * aspeed_disable_sig() - Disable a signal on a pin by disabling all provided
+ * signal expressions.
+ *
+ * @ctx: The pinmux context
+ * @exprs: The list of signal expressions (from a priority level on a pin)
+ *
+ * Return: 0 if all expressions are disabled, otherwise a negative error code
+ */
+static int aspeed_disable_sig(struct aspeed_pinmux_data *ctx,
+			      const struct aspeed_sig_expr **exprs)
+{
+	int ret = 0;
+
+	if (!exprs)
+		return -EINVAL;
+
+	while (*exprs && !ret) {
+		ret = aspeed_sig_expr_disable(ctx, *exprs);
+		exprs++;
+	}
+
+	return ret;
+}
+
+/**
+ * aspeed_find_expr_by_name - Search for the signal expression needed to
+ * enable the pin's signal for the requested function.
+ *
+ * @exprs: List of signal expressions (haystack)
+ * @name: The name of the requested function (needle)
+ *
+ * Return: A pointer to the signal expression whose function tag matches the
+ * provided name, otherwise NULL.
+ *
+ */
+static const struct aspeed_sig_expr *aspeed_find_expr_by_name(
+		const struct aspeed_sig_expr **exprs, const char *name)
+{
+	while (*exprs) {
+		if (strcmp((*exprs)->function, name) == 0)
+			return *exprs;
+		exprs++;
+	}
+
+	return NULL;
+}
+
+static char *get_defined_attribute(const struct aspeed_pin_desc *pdesc,
+				   const char *(*get)(
+					   const struct aspeed_sig_expr *))
+{
+	char *found = NULL;
+	size_t len = 0;
+	const struct aspeed_sig_expr ***prios, **funcs, *expr;
+
+	prios = pdesc->prios;
+
+	while ((funcs = *prios)) {
+		while ((expr = *funcs)) {
+			const char *str = get(expr);
+			size_t delta = strlen(str) + 2;
+			char *expanded;
+
+			expanded = krealloc(found, len + delta + 1, GFP_KERNEL);
+			if (!expanded) {
+				kfree(found);
+				return expanded;
+			}
+
+			found = expanded;
+			found[len] = '\0';
+			len += delta;
+
+			strcat(found, str);
+			strcat(found, ", ");
+
+			funcs++;
+		}
+		prios++;
+	}
+
+	if (len < 2) {
+		kfree(found);
+		return NULL;
+	}
+
+	found[len - 2] = '\0';
+
+	return found;
+}
+
+static const char *aspeed_sig_expr_function(const struct aspeed_sig_expr *expr)
+{
+	return expr->function;
+}
+
+static char *get_defined_functions(const struct aspeed_pin_desc *pdesc)
+{
+	return get_defined_attribute(pdesc, aspeed_sig_expr_function);
+}
+
+static const char *aspeed_sig_expr_signal(const struct aspeed_sig_expr *expr)
+{
+	return expr->signal;
+}
+
+static char *get_defined_signals(const struct aspeed_pin_desc *pdesc)
+{
+	return get_defined_attribute(pdesc, aspeed_sig_expr_signal);
+}
+
+int aspeed_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
+			  unsigned int group)
+{
+	int i;
+	int ret;
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	const struct aspeed_pin_group *pgroup = &pdata->pinmux.groups[group];
+	const struct aspeed_pin_function *pfunc =
+		&pdata->pinmux.functions[function];
+
+	for (i = 0; i < pgroup->npins; i++) {
+		int pin = pgroup->pins[i];
+		const struct aspeed_pin_desc *pdesc = pdata->pins[pin].drv_data;
+		const struct aspeed_sig_expr *expr = NULL;
+		const struct aspeed_sig_expr **funcs;
+		const struct aspeed_sig_expr ***prios;
+
+		if (!pdesc)
+			return -EINVAL;
+
+		pr_debug("Muxing pin %s for %s\n", pdesc->name, pfunc->name);
+
+		prios = pdesc->prios;
+
+		if (!prios)
+			continue;
+
+		/* Disable functions at a higher priority than that requested */
+		while ((funcs = *prios)) {
+			expr = aspeed_find_expr_by_name(funcs, pfunc->name);
+
+			if (expr)
+				break;
+
+			ret = aspeed_disable_sig(&pdata->pinmux, funcs);
+			if (ret)
+				return ret;
+
+			prios++;
+		}
+
+		if (!expr) {
+			char *functions = get_defined_functions(pdesc);
+			char *signals = get_defined_signals(pdesc);
+
+			pr_warn("No function %s found on pin %s (%d). Found signal(s) %s for function(s) %s\n",
+				pfunc->name, pdesc->name, pin, signals,
+				functions);
+			kfree(signals);
+			kfree(functions);
+
+			return -ENXIO;
+		}
+
+		ret = aspeed_sig_expr_enable(&pdata->pinmux, expr);
+		if (ret)
+			return ret;
+
+		pr_debug("Muxed pin %s as %s for %s\n", pdesc->name, expr->signal,
+			 expr->function);
+	}
+
+	return 0;
+}
+
+static bool aspeed_expr_is_gpio(const struct aspeed_sig_expr *expr)
+{
+	/*
+	 * We need to differentiate between GPIO and non-GPIO signals to
+	 * implement the gpio_request_enable() interface. For better or worse
+	 * the ASPEED pinctrl driver uses the expression names to determine
+	 * whether an expression will mux a pin for GPIO.
+	 *
+	 * Generally we have the following - A GPIO such as B1 has:
+	 *
+	 *    - expr->signal set to "GPIOB1"
+	 *    - expr->function set to "GPIOB1"
+	 *
+	 * Using this fact we can determine whether the provided expression is
+	 * a GPIO expression by testing the signal name for the string prefix
+	 * "GPIO".
+	 *
+	 * However, some GPIOs are input-only, and the ASPEED datasheets name
+	 * them differently. An input-only GPIO such as T0 has:
+	 *
+	 *    - expr->signal set to "GPIT0"
+	 *    - expr->function set to "GPIT0"
+	 *
+	 * It's tempting to generalise the prefix test from "GPIO" to "GPI" to
+	 * account for both GPIOs and GPIs, but in doing so we run aground on
+	 * another feature:
+	 *
+	 * Some pins in the ASPEED BMC SoCs have a "pass-through" GPIO
+	 * function where the input state of one pin is replicated as the
+	 * output state of another (as if they were shorted together - a mux
+	 * configuration that is typically enabled by hardware strapping).
+	 * This feature allows the BMC to pass e.g. power button state through
+	 * to the host while the BMC is yet to boot, but take control of the
+	 * button state once the BMC has booted by muxing each pin as a
+	 * separate, pin-specific GPIO.
+	 *
+	 * Conceptually this pass-through mode is a form of GPIO and is named
+	 * as such in the datasheets, e.g. "GPID0". This naming similarity
+	 * trips us up with the simple GPI-prefixed-signal-name scheme
+	 * discussed above, as the pass-through configuration is not what we
+	 * want when muxing a pin as GPIO for the GPIO subsystem.
+	 *
+	 * On e.g. the AST2400, a pass-through function "GPID0" is grouped on
+	 * balls A18 and D16, where we have:
+	 *
+	 *    For ball A18:
+	 *    - expr->signal set to "GPID0IN"
+	 *    - expr->function set to "GPID0"
+	 *
+	 *    For ball D16:
+	 *    - expr->signal set to "GPID0OUT"
+	 *    - expr->function set to "GPID0"
+	 *
+	 * By contrast, the pin-specific GPIO expressions for the same pins are
+	 * as follows:
+	 *
+	 *    For ball A18:
+	 *    - expr->signal looks like "GPIOD0"
+	 *    - expr->function looks like "GPIOD0"
+	 *
+	 *    For ball D16:
+	 *    - expr->signal looks like "GPIOD1"
+	 *    - expr->function looks like "GPIOD1"
+	 *
+	 * Testing both the signal _and_ function names gives us the means
+	 * differentiate the pass-through GPIO pinmux configuration from the
+	 * pin-specific configuration that the GPIO subsystem is after: An
+	 * expression is a pin-specific (non-pass-through) GPIO configuration
+	 * if the signal prefix is "GPI" and the signal name matches the
+	 * function name.
+	 */
+	return !strncmp(expr->signal, "GPI", 3) &&
+			!strcmp(expr->signal, expr->function);
+}
+
+static bool aspeed_gpio_in_exprs(const struct aspeed_sig_expr **exprs)
+{
+	if (!exprs)
+		return false;
+
+	while (*exprs) {
+		if (aspeed_expr_is_gpio(*exprs))
+			return true;
+		exprs++;
+	}
+
+	return false;
+}
+
+int aspeed_gpio_request_enable(struct pinctrl_dev *pctldev,
+			       struct pinctrl_gpio_range *range,
+			       unsigned int offset)
+{
+	int ret;
+	struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	const struct aspeed_pin_desc *pdesc = pdata->pins[offset].drv_data;
+	const struct aspeed_sig_expr ***prios, **funcs, *expr;
+
+	if (!pdesc)
+		return -EINVAL;
+
+	prios = pdesc->prios;
+
+	if (!prios)
+		return -ENXIO;
+
+	pr_debug("Muxing pin %s for GPIO\n", pdesc->name);
+
+	/* Disable any functions of higher priority than GPIO */
+	while ((funcs = *prios)) {
+		if (aspeed_gpio_in_exprs(funcs))
+			break;
+
+		ret = aspeed_disable_sig(&pdata->pinmux, funcs);
+		if (ret)
+			return ret;
+
+		prios++;
+	}
+
+	if (!funcs) {
+		char *signals = get_defined_signals(pdesc);
+
+		pr_warn("No GPIO signal type found on pin %s (%d). Found: %s\n",
+			pdesc->name, offset, signals);
+		kfree(signals);
+
+		return -ENXIO;
+	}
+
+	expr = *funcs;
+
+	/*
+	 * Disabling all higher-priority expressions is enough to enable the
+	 * lowest-priority signal type. As such it has no associated
+	 * expression.
+	 */
+	if (!expr) {
+		pr_debug("Muxed pin %s as GPIO\n", pdesc->name);
+		return 0;
+	}
+
+	/*
+	 * If GPIO is not the lowest priority signal type, assume there is only
+	 * one expression defined to enable the GPIO function
+	 */
+	ret = aspeed_sig_expr_enable(&pdata->pinmux, expr);
+	if (ret)
+		return ret;
+
+	pr_debug("Muxed pin %s as %s\n", pdesc->name, expr->signal);
+
+	return 0;
+}
+
+int aspeed_pinctrl_probe(struct platform_device *pdev,
+			 const struct pinctrl_desc *pdesc,
+			 struct aspeed_pinctrl_data *pdata)
+{
+	struct device *parent;
+	struct pinctrl_dev *pctl;
+
+	parent = pdev->dev.parent;
+	if (!parent) {
+		dev_err(&pdev->dev, "No parent for syscon pincontroller\n");
+		return -ENODEV;
+	}
+
+	pdata->scu = syscon_node_to_regmap(parent->of_node);
+	if (IS_ERR(pdata->scu)) {
+		dev_err(&pdev->dev, "No regmap for syscon pincontroller parent\n");
+		return PTR_ERR(pdata->scu);
+	}
+
+	pdata->pinmux.maps[ASPEED_IP_SCU] = pdata->scu;
+
+	pctl = pinctrl_register(pdesc, &pdev->dev, pdata);
+
+	if (IS_ERR(pctl)) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return PTR_ERR(pctl);
+	}
+
+	platform_set_drvdata(pdev, pdata);
+
+	return 0;
+}
+
+static inline bool pin_in_config_range(unsigned int offset,
+		const struct aspeed_pin_config *config)
+{
+	return offset >= config->pins[0] && offset <= config->pins[1];
+}
+
+static inline const struct aspeed_pin_config *find_pinconf_config(
+		const struct aspeed_pinctrl_data *pdata,
+		unsigned int offset,
+		enum pin_config_param param)
+{
+	unsigned int i;
+
+	for (i = 0; i < pdata->nconfigs; i++) {
+		if (param == pdata->configs[i].param &&
+				pin_in_config_range(offset, &pdata->configs[i]))
+			return &pdata->configs[i];
+	}
+
+	return NULL;
+}
+
+enum aspeed_pin_config_map_type { MAP_TYPE_ARG, MAP_TYPE_VAL };
+
+static const struct aspeed_pin_config_map *find_pinconf_map(
+		const struct aspeed_pinctrl_data *pdata,
+		enum pin_config_param param,
+		enum aspeed_pin_config_map_type type,
+		s64 value)
+{
+	int i;
+
+	for (i = 0; i < pdata->nconfmaps; i++) {
+		const struct aspeed_pin_config_map *elem;
+		bool match;
+
+		elem = &pdata->confmaps[i];
+
+		switch (type) {
+		case MAP_TYPE_ARG:
+			match = (elem->arg == -1 || elem->arg == value);
+			break;
+		case MAP_TYPE_VAL:
+			match = (elem->val == value);
+			break;
+		}
+
+		if (param == elem->param && match)
+			return elem;
+	}
+
+	return NULL;
+}
+
+int aspeed_pin_config_get(struct pinctrl_dev *pctldev, unsigned int offset,
+		unsigned long *config)
+{
+	const enum pin_config_param param = pinconf_to_config_param(*config);
+	const struct aspeed_pin_config_map *pmap;
+	const struct aspeed_pinctrl_data *pdata;
+	const struct aspeed_pin_config *pconf;
+	unsigned int val;
+	int rc = 0;
+	u32 arg;
+
+	pdata = pinctrl_dev_get_drvdata(pctldev);
+	pconf = find_pinconf_config(pdata, offset, param);
+	if (!pconf)
+		return -ENOTSUPP;
+
+	rc = regmap_read(pdata->scu, pconf->reg, &val);
+	if (rc < 0)
+		return rc;
+
+	pmap = find_pinconf_map(pdata, param, MAP_TYPE_VAL,
+			(val & pconf->mask) >> __ffs(pconf->mask));
+
+	if (!pmap)
+		return -EINVAL;
+
+	if (param == PIN_CONFIG_DRIVE_STRENGTH)
+		arg = (u32) pmap->arg;
+	else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
+		arg = !!pmap->arg;
+	else
+		arg = 1;
+
+	if (!arg)
+		return -EINVAL;
+
+	*config = pinconf_to_config_packed(param, arg);
+
+	return 0;
+}
+
+int aspeed_pin_config_set(struct pinctrl_dev *pctldev, unsigned int offset,
+		unsigned long *configs, unsigned int num_configs)
+{
+	const struct aspeed_pinctrl_data *pdata;
+	unsigned int i;
+	int rc = 0;
+
+	pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	for (i = 0; i < num_configs; i++) {
+		const struct aspeed_pin_config_map *pmap;
+		const struct aspeed_pin_config *pconf;
+		enum pin_config_param param;
+		unsigned int val;
+		u32 arg;
+
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		pconf = find_pinconf_config(pdata, offset, param);
+		if (!pconf)
+			return -ENOTSUPP;
+
+		pmap = find_pinconf_map(pdata, param, MAP_TYPE_ARG, arg);
+
+		if (WARN_ON(!pmap))
+			return -EINVAL;
+
+		val = pmap->val << __ffs(pconf->mask);
+
+		rc = regmap_update_bits(pdata->scu, pconf->reg,
+					pconf->mask, val);
+
+		if (rc < 0)
+			return rc;
+
+		pr_debug("%s: Set SCU%02X[0x%08X]=0x%X for param %d(=%d) on pin %d\n",
+				__func__, pconf->reg, pconf->mask,
+				val, param, arg, offset);
+	}
+
+	return 0;
+}
+
+int aspeed_pin_config_group_get(struct pinctrl_dev *pctldev,
+		unsigned int selector,
+		unsigned long *config)
+{
+	const unsigned int *pins;
+	unsigned int npins;
+	int rc;
+
+	rc = aspeed_pinctrl_get_group_pins(pctldev, selector, &pins, &npins);
+	if (rc < 0)
+		return rc;
+
+	if (!npins)
+		return -ENODEV;
+
+	rc = aspeed_pin_config_get(pctldev, pins[0], config);
+
+	return rc;
+}
+
+int aspeed_pin_config_group_set(struct pinctrl_dev *pctldev,
+		unsigned int selector,
+		unsigned long *configs,
+		unsigned int num_configs)
+{
+	const unsigned int *pins;
+	unsigned int npins;
+	int rc;
+	int i;
+
+	pr_debug("%s: Fetching pins for group selector %d\n",
+			__func__, selector);
+	rc = aspeed_pinctrl_get_group_pins(pctldev, selector, &pins, &npins);
+	if (rc < 0)
+		return rc;
+
+	for (i = 0; i < npins; i++) {
+		rc = aspeed_pin_config_set(pctldev, pins[i], configs,
+				num_configs);
+		if (rc < 0)
+			return rc;
+	}
+
+	return 0;
+}