Changes queued in gpio/next for the start of the 3.3 merge window

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Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux-2.6

Changes queued in gpio/next for the start of the 3.3 merge window

* tag 'gpio-for-linus-20120104' of git://git.secretlab.ca/git/linux-2.6:
  gpio: Add decode of WM8994 GPIO configuration
  gpio: Convert GPIO drivers to module_platform_driver
  gpio: Fix typo in comment in Samsung driver
  gpio: Explicitly index samsung_gpio_cfgs
  gpio: Add Linus Walleij as gpio co-maintainer
  of: Add device tree selftests
  of: create of_phandle_args to simplify return of phandle parsing data
  gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags()
  gpio/microblaze: Eliminate duplication of of_get_named_gpio_flags()
  gpiolib: output basic details and consolidate gpio device drivers
  pch_gpio: Change company name OKI SEMICONDUCTOR to LAPIS Semiconductor
  pch_gpio: Support new device LAPIS Semiconductor ML7831 IOH
  spi/pl022: make the chip deselect handling thread safe
  spi/pl022: add support for pm_runtime autosuspend
  spi/pl022: disable the PL022 block when unused
  spi/pl022: move device disable to workqueue thread
  spi/pl022: skip default configuration before suspending
  spi/pl022: fix build warnings
  spi/pl022: only enable RX interrupts when TX is complete

drivers/of/Kconfig

@@ -15,6 +15,15 @@ config PROC_DEVICETREE
 	  an image of the device tree that the kernel copies from Open
 	  Firmware or other boot firmware. If unsure, say Y here.
 
+config OF_SELFTEST
+	bool "Device Tree Runtime self tests"
+	help
+	  This option builds in test cases for the device tree infrastructure
+	  that are executed one at boot time, and the results dumped to the
+	  console.
+
+	  If unsure, say N here, but this option is safe to enable.
+
 config OF_FLATTREE
 	bool
 	select DTC

drivers/of/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_OF_GPIO)   += gpio.o
 obj-$(CONFIG_OF_I2C)	+= of_i2c.o
 obj-$(CONFIG_OF_NET)	+= of_net.o
 obj-$(CONFIG_OF_SPI)	+= of_spi.o
+obj-$(CONFIG_OF_SELFTEST) += selftest.o
 obj-$(CONFIG_OF_MDIO)	+= of_mdio.o
 obj-$(CONFIG_OF_PCI)	+= of_pci.o
 obj-$(CONFIG_OF_PCI_IRQ)  += of_pci_irq.o

drivers/of/base.c

@@ -824,17 +824,19 @@ of_parse_phandle(struct device_node *np, const char *phandle_name, int index)
 EXPORT_SYMBOL(of_parse_phandle);
 
 /**
- * of_parse_phandles_with_args - Find a node pointed by phandle in a list
+ * of_parse_phandle_with_args() - Find a node pointed by phandle in a list
  * @np:		pointer to a device tree node containing a list
  * @list_name:	property name that contains a list
  * @cells_name:	property name that specifies phandles' arguments count
  * @index:	index of a phandle to parse out
- * @out_node:	optional pointer to device_node struct pointer (will be filled)
- * @out_args:	optional pointer to arguments pointer (will be filled)
+ * @out_args:	optional pointer to output arguments structure (will be filled)
  *
  * This function is useful to parse lists of phandles and their arguments.
- * Returns 0 on success and fills out_node and out_args, on error returns
- * appropriate errno value.
+ * Returns 0 on success and fills out_args, on error returns appropriate
+ * errno value.
+ *
+ * Caller is responsible to call of_node_put() on the returned out_args->node
+ * pointer.
  *
  * Example:
  *
@@ -851,94 +853,96 @@ EXPORT_SYMBOL(of_parse_phandle);
  * }
  *
  * To get a device_node of the `node2' node you may call this:
- * of_parse_phandles_with_args(node3, "list", "#list-cells", 2, &node2, &args);
+ * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
  */
-int of_parse_phandles_with_args(struct device_node *np, const char *list_name,
+int of_parse_phandle_with_args(struct device_node *np, const char *list_name,
 				const char *cells_name, int index,
-				struct device_node **out_node,
-				const void **out_args)
+				struct of_phandle_args *out_args)
 {
-	int ret = -EINVAL;
-	const __be32 *list;
-	const __be32 *list_end;
-	int size;
-	int cur_index = 0;
+	const __be32 *list, *list_end;
+	int size, cur_index = 0;
+	uint32_t count = 0;
 	struct device_node *node = NULL;
-	const void *args = NULL;
+	phandle phandle;
 
+	/* Retrieve the phandle list property */
 	list = of_get_property(np, list_name, &size);
-	if (!list) {
-		ret = -ENOENT;
-		goto err0;
-	}
+	if (!list)
+		return -EINVAL;
 	list_end = list + size / sizeof(*list);
 
+	/* Loop over the phandles until all the requested entry is found */
 	while (list < list_end) {
-		const __be32 *cells;
-		phandle phandle;
+		count = 0;
 
+		/*
+		 * If phandle is 0, then it is an empty entry with no
+		 * arguments.  Skip forward to the next entry.
+		 */
 		phandle = be32_to_cpup(list++);
-		args = list;
+		if (phandle) {
+			/*
+			 * Find the provider node and parse the #*-cells
+			 * property to determine the argument length
+			 */
+			node = of_find_node_by_phandle(phandle);
+			if (!node) {
+				pr_err("%s: could not find phandle\n",
+					 np->full_name);
+				break;
+			}
+			if (of_property_read_u32(node, cells_name, &count)) {
+				pr_err("%s: could not get %s for %s\n",
+					 np->full_name, cells_name,
+					 node->full_name);
+				break;
+			}
 
-		/* one cell hole in the list = <>; */
-		if (!phandle)
-			goto next;
-
-		node = of_find_node_by_phandle(phandle);
-		if (!node) {
-			pr_debug("%s: could not find phandle\n",
-				 np->full_name);
-			goto err0;
+			/*
+			 * Make sure that the arguments actually fit in the
+			 * remaining property data length
+			 */
+			if (list + count > list_end) {
+				pr_err("%s: arguments longer than property\n",
+					 np->full_name);
+				break;
+			}
 		}
 
-		cells = of_get_property(node, cells_name, &size);
-		if (!cells || size != sizeof(*cells)) {
-			pr_debug("%s: could not get %s for %s\n",
-				 np->full_name, cells_name, node->full_name);
-			goto err1;
-		}
+		/*
+		 * All of the error cases above bail out of the loop, so at
+		 * this point, the parsing is successful. If the requested
+		 * index matches, then fill the out_args structure and return,
+		 * or return -ENOENT for an empty entry.
+		 */
+		if (cur_index == index) {
+			if (!phandle)
+				return -ENOENT;
 
-		list += be32_to_cpup(cells);
-		if (list > list_end) {
-			pr_debug("%s: insufficient arguments length\n",
-				 np->full_name);
-			goto err1;
+			if (out_args) {
+				int i;
+				if (WARN_ON(count > MAX_PHANDLE_ARGS))
+					count = MAX_PHANDLE_ARGS;
+				out_args->np = node;
+				out_args->args_count = count;
+				for (i = 0; i < count; i++)
+					out_args->args[i] = be32_to_cpup(list++);
+			}
+			return 0;
 		}
-next:
-		if (cur_index == index)
-			break;
 
 		of_node_put(node);
 		node = NULL;
-		args = NULL;
+		list += count;
 		cur_index++;
 	}
 
-	if (!node) {
-		/*
-		 * args w/o node indicates that the loop above has stopped at
-		 * the 'hole' cell. Report this differently.
-		 */
-		if (args)
-			ret = -EEXIST;
-		else
-			ret = -ENOENT;
-		goto err0;
-	}
-
-	if (out_node)
-		*out_node = node;
-	if (out_args)
-		*out_args = args;
-
-	return 0;
-err1:
-	of_node_put(node);
-err0:
-	pr_debug("%s failed with status %d\n", __func__, ret);
-	return ret;
+	/* Loop exited without finding a valid entry; return an error */
+	if (node)
+		of_node_put(node);
+	return -EINVAL;
 }
-EXPORT_SYMBOL(of_parse_phandles_with_args);
+EXPORT_SYMBOL(of_parse_phandle_with_args);
 
 /**
  * prom_add_property - Add a property to a node

drivers/of/gpio.c

@@ -35,32 +35,27 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
                            int index, enum of_gpio_flags *flags)
 {
 	int ret;
-	struct device_node *gpio_np;
 	struct gpio_chip *gc;
-	int size;
-	const void *gpio_spec;
-	const __be32 *gpio_cells;
+	struct of_phandle_args gpiospec;
 
-	ret = of_parse_phandles_with_args(np, propname, "#gpio-cells", index,
-					  &gpio_np, &gpio_spec);
+	ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
+					 &gpiospec);
 	if (ret) {
 		pr_debug("%s: can't parse gpios property\n", __func__);
 		goto err0;
 	}
 
-	gc = of_node_to_gpiochip(gpio_np);
+	gc = of_node_to_gpiochip(gpiospec.np);
 	if (!gc) {
 		pr_debug("%s: gpio controller %s isn't registered\n",
-			 np->full_name, gpio_np->full_name);
+			 np->full_name, gpiospec.np->full_name);
 		ret = -ENODEV;
 		goto err1;
 	}
 
-	gpio_cells = of_get_property(gpio_np, "#gpio-cells", &size);
-	if (!gpio_cells || size != sizeof(*gpio_cells) ||
-			be32_to_cpup(gpio_cells) != gc->of_gpio_n_cells) {
+	if (gpiospec.args_count != gc->of_gpio_n_cells) {
 		pr_debug("%s: wrong #gpio-cells for %s\n",
-			 np->full_name, gpio_np->full_name);
+			 np->full_name, gpiospec.np->full_name);
 		ret = -EINVAL;
 		goto err1;
 	}
@@ -69,13 +64,13 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
 	if (flags)
 		*flags = 0;
 
-	ret = gc->of_xlate(gc, np, gpio_spec, flags);
+	ret = gc->of_xlate(gc, &gpiospec, flags);
 	if (ret < 0)
 		goto err1;
 
 	ret += gc->base;
 err1:
-	of_node_put(gpio_np);
+	of_node_put(gpiospec.np);
 err0:
 	pr_debug("%s exited with status %d\n", __func__, ret);
 	return ret;
@@ -105,8 +100,8 @@ unsigned int of_gpio_count(struct device_node *np)
 	do {
 		int ret;
 
-		ret = of_parse_phandles_with_args(np, "gpios", "#gpio-cells",
-						  cnt, NULL, NULL);
+		ret = of_parse_phandle_with_args(np, "gpios", "#gpio-cells",
+						 cnt, NULL);
 		/* A hole in the gpios = <> counts anyway. */
 		if (ret < 0 && ret != -EEXIST)
 			break;
@@ -127,12 +122,9 @@ EXPORT_SYMBOL(of_gpio_count);
  * gpio chips. This function performs only one sanity check: whether gpio
  * is less than ngpios (that is specified in the gpio_chip).
  */
-int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
-			 const void *gpio_spec, u32 *flags)
+int of_gpio_simple_xlate(struct gpio_chip *gc,
+			 const struct of_phandle_args *gpiospec, u32 *flags)
 {
-	const __be32 *gpio = gpio_spec;
-	const u32 n = be32_to_cpup(gpio);
-
 	/*
 	 * We're discouraging gpio_cells < 2, since that way you'll have to
 	 * write your own xlate function (that will have to retrive the GPIO
@@ -144,13 +136,16 @@ int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
 		return -EINVAL;
 	}
 
-	if (n > gc->ngpio)
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] > gc->ngpio)
 		return -EINVAL;
 
 	if (flags)
-		*flags = be32_to_cpu(gpio[1]);
+		*flags = gpiospec->args[1];
 
-	return n;
+	return gpiospec->args[0];
 }
 EXPORT_SYMBOL(of_gpio_simple_xlate);
 
@@ -198,8 +193,6 @@ int of_mm_gpiochip_add(struct device_node *np,
 	if (ret)
 		goto err2;
 
-	pr_debug("%s: registered as generic GPIO chip, base is %d\n",
-		 np->full_name, gc->base);
 	return 0;
 err2:
 	iounmap(mm_gc->regs);

drivers/of/selftest.c

@@ -0,0 +1,139 @@
+/*
+ * Self tests for device tree subsystem
+ */
+
+#define pr_fmt(fmt) "### %s(): " fmt, __func__
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+
+static bool selftest_passed = true;
+#define selftest(result, fmt, ...) { \
+	selftest_passed &= (result); \
+	if (!(result)) \
+		pr_err("FAIL %s:%i " fmt, __FILE__, __LINE__, ##__VA_ARGS__); \
+}
+
+static void __init of_selftest_parse_phandle_with_args(void)
+{
+	struct device_node *np;
+	struct of_phandle_args args;
+	int rc, i;
+	bool passed_all = true;
+
+	pr_info("start\n");
+	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
+	if (!np) {
+		pr_err("missing testcase data\n");
+		return;
+	}
+
+	for (i = 0; i < 7; i++) {
+		bool passed = true;
+		rc = of_parse_phandle_with_args(np, "phandle-list",
+						"#phandle-cells", i, &args);
+
+		/* Test the values from tests-phandle.dtsi */
+		switch (i) {
+		case 0:
+			passed &= !rc;
+			passed &= (args.args_count == 1);
+			passed &= (args.args[0] == (i + 1));
+			break;
+		case 1:
+			passed &= !rc;
+			passed &= (args.args_count == 2);
+			passed &= (args.args[0] == (i + 1));
+			passed &= (args.args[1] == 0);
+			break;
+		case 2:
+			passed &= (rc == -ENOENT);
+			break;
+		case 3:
+			passed &= !rc;
+			passed &= (args.args_count == 3);
+			passed &= (args.args[0] == (i + 1));
+			passed &= (args.args[1] == 4);
+			passed &= (args.args[2] == 3);
+			break;
+		case 4:
+			passed &= !rc;
+			passed &= (args.args_count == 2);
+			passed &= (args.args[0] == (i + 1));
+			passed &= (args.args[1] == 100);
+			break;
+		case 5:
+			passed &= !rc;
+			passed &= (args.args_count == 0);
+			break;
+		case 6:
+			passed &= !rc;
+			passed &= (args.args_count == 1);
+			passed &= (args.args[0] == (i + 1));
+			break;
+		case 7:
+			passed &= (rc == -EINVAL);
+			break;
+		default:
+			passed = false;
+		}
+
+		if (!passed) {
+			int j;
+			pr_err("index %i - data error on node %s rc=%i regs=[",
+				i, args.np->full_name, rc);
+			for (j = 0; j < args.args_count; j++)
+				printk(" %i", args.args[j]);
+			printk(" ]\n");
+
+			passed_all = false;
+		}
+	}
+
+	/* Check for missing list property */
+	rc = of_parse_phandle_with_args(np, "phandle-list-missing",
+					"#phandle-cells", 0, &args);
+	passed_all &= (rc == -EINVAL);
+
+	/* Check for missing cells property */
+	rc = of_parse_phandle_with_args(np, "phandle-list",
+					"#phandle-cells-missing", 0, &args);
+	passed_all &= (rc == -EINVAL);
+
+	/* Check for bad phandle in list */
+	rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
+					"#phandle-cells", 0, &args);
+	passed_all &= (rc == -EINVAL);
+
+	/* Check for incorrectly formed argument list */
+	rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
+					"#phandle-cells", 1, &args);
+	passed_all &= (rc == -EINVAL);
+
+	pr_info("end - %s\n", passed_all ? "PASS" : "FAIL");
+}
+
+static int __init of_selftest(void)
+{
+	struct device_node *np;
+
+	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
+	if (!np) {
+		pr_info("No testcase data in device tree; not running tests\n");
+		return 0;
+	}
+	of_node_put(np);
+
+	pr_info("start of selftest - you will see error messages\n");
+	of_selftest_parse_phandle_with_args();
+	pr_info("end of selftest - %s\n", selftest_passed ? "PASS" : "FAIL");
+	return 0;
+}
+late_initcall(of_selftest);