Merge tag 'pinctrl-v5.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl

Pull pin control bulk updates from Linus Walleij:
 "Core changes:

   - New standard enumerator and corresponding device tree bindings for
     output impedance pin configuration. (Implemented and used in the
     Renesas rzg2l driver.)

   - Cleanup of Kconfig and Makefile to be somewhat orderly and
     alphabetic.

  New drivers:

   - Samsung Exynos 7885 pin controller.

   - Ocelot LAN966x pin controller.

   - Qualcomm SDX65 pin controller.

   - Qualcomm SM8450 pin controller.

   - Qualcomm PM8019, PM8226 and PM2250 pin controllers.

   - NXP/Freescale i.MXRT1050 pin controller.

   - Intel Thunder Bay pin controller.

  Enhancements:

   - Introduction of the string library helper function
     "kasprintf_strarray()" and subsequent use in Rockchip, ST and
     Armada pin control drivers, as well as the GPIO mockup driver.

   - The Ocelot pin controller has been extensively rewritten to use
     regmap and other modern kernel infrastructure.

   - The Microchip SGPIO driver has been converted to use regmap.

   - The SPEAr driver had been converted to use regmap.

   - Substantial cleanups and janitorial on the Apple pin control driver
     that was merged for v5.16.

   - Janitorial to remove of_node assignments in the GPIO portions that
     anyway get this handled in the GPIO core.

   - Minor cleanups and improvements in several pin controllers"

* tag 'pinctrl-v5.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (98 commits)
  pinctrl: imx: fix assigning groups names
  dt-bindings: pinctrl: mt8195: add wrapping node of pin configurations
  pinctrl: bcm: ns: use generic groups & functions helpers
  pinctrl: imx: fix allocation result check
  pinctrl: samsung: Use platform_get_irq_optional() to get the interrupt
  pinctrl: Propagate firmware node from a parent device
  dt-bindings: pinctrl: qcom: Add SDX65 pinctrl bindings
  pinctrl: add one more "const" for generic function groups
  pinctrl: keembay: rework loops looking for groups names
  pinctrl: keembay: comment process of building functions a bit
  pinctrl: imx: prepare for making "group_names" in "function_desc" const
  ARM: dts: gpio-ranges property is now required
  pinctrl: aspeed: fix unmet dependencies on MFD_SYSCON for PINCTRL_ASPEED
  pinctrl: Get rid of duplicate of_node assignment in the drivers
  pinctrl-sunxi: don't call pinctrl_gpio_direction()
  pinctrl-bcm2835: don't call pinctrl_gpio_direction()
  pinctrl: bcm2835: Silence uninit warning
  pinctrl: Sort Kconfig and Makefile entries alphabetically
  pinctrl: Add Intel Thunder Bay pinctrl driver
  dt-bindings: pinctrl: Add bindings for Intel Thunderbay pinctrl driver
  ...

1 files changed, 64 insertions, 0 deletions

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index d5d008f5b1d9..90f9f1b7afec 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -10,6 +10,7 @@
 #include <linux/math64.h>
 #include <linux/export.h>
 #include <linux/ctype.h>
+#include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/limits.h>
@@ -675,6 +676,39 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
 EXPORT_SYMBOL_GPL(kstrdup_quotable_file);
 
 /**
+ * kasprintf_strarray - allocate and fill array of sequential strings
+ * @gfp: flags for the slab allocator
+ * @prefix: prefix to be used
+ * @n: amount of lines to be allocated and filled
+ *
+ * Allocates and fills @n strings using pattern "%s-%zu", where prefix
+ * is provided by caller. The caller is responsible to free them with
+ * kfree_strarray() after use.
+ *
+ * Returns array of strings or NULL when memory can't be allocated.
+ */
+char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n)
+{
+	char **names;
+	size_t i;
+
+	names = kcalloc(n + 1, sizeof(char *), gfp);
+	if (!names)
+		return NULL;
+
+	for (i = 0; i < n; i++) {
+		names[i] = kasprintf(gfp, "%s-%zu", prefix, i);
+		if (!names[i]) {
+			kfree_strarray(names, i);
+			return NULL;
+		}
+	}
+
+	return names;
+}
+EXPORT_SYMBOL_GPL(kasprintf_strarray);
+
+/**
  * kfree_strarray - free a number of dynamically allocated strings contained
  *                  in an array and the array itself
  *
@@ -697,6 +731,36 @@ void kfree_strarray(char **array, size_t n)
 }
 EXPORT_SYMBOL_GPL(kfree_strarray);
 
+struct strarray {
+	char **array;
+	size_t n;
+};
+
+static void devm_kfree_strarray(struct device *dev, void *res)
+{
+	struct strarray *array = res;
+
+	kfree_strarray(array->array, array->n);
+}
+
+char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n)
+{
+	struct strarray *ptr;
+
+	ptr = devres_alloc(devm_kfree_strarray, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	ptr->array = kasprintf_strarray(GFP_KERNEL, prefix, n);
+	if (!ptr->array) {
+		devres_free(ptr);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	return ptr->array;
+}
+EXPORT_SYMBOL_GPL(devm_kasprintf_strarray);
+
 /**
  * strscpy_pad() - Copy a C-string into a sized buffer
  * @dest: Where to copy the string to