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-rw-r--r--drivers/of/Kconfig9
-rw-r--r--drivers/of/Makefile1
-rw-r--r--drivers/of/address.c16
-rw-r--r--drivers/of/base.c156
-rw-r--r--drivers/of/fdt.c6
-rw-r--r--drivers/of/gpio.c45
-rw-r--r--drivers/of/irq.c26
-rw-r--r--drivers/of/pdt.c2
-rw-r--r--drivers/of/platform.c2
-rw-r--r--drivers/of/selftest.c139
10 files changed, 280 insertions, 122 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index cac63c9f49a..268163dd71c 100644
--- a/drivers/of/Kconfig
+++ b/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
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index dccb1176be5..a73f5a51ff4 100644
--- a/drivers/of/Makefile
+++ b/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
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 72c33fbe451..66d96f14c27 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -14,7 +14,7 @@
static struct of_bus *of_match_bus(struct device_node *np);
static int __of_address_to_resource(struct device_node *dev,
const __be32 *addrp, u64 size, unsigned int flags,
- struct resource *r);
+ const char *name, struct resource *r);
/* Debug utility */
#ifdef DEBUG
@@ -215,7 +215,7 @@ int of_pci_address_to_resource(struct device_node *dev, int bar,
addrp = of_get_pci_address(dev, bar, &size, &flags);
if (addrp == NULL)
return -EINVAL;
- return __of_address_to_resource(dev, addrp, size, flags, r);
+ return __of_address_to_resource(dev, addrp, size, flags, NULL, r);
}
EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
#endif /* CONFIG_PCI */
@@ -529,7 +529,7 @@ EXPORT_SYMBOL(of_get_address);
static int __of_address_to_resource(struct device_node *dev,
const __be32 *addrp, u64 size, unsigned int flags,
- struct resource *r)
+ const char *name, struct resource *r)
{
u64 taddr;
@@ -551,7 +551,8 @@ static int __of_address_to_resource(struct device_node *dev,
r->end = taddr + size - 1;
}
r->flags = flags;
- r->name = dev->full_name;
+ r->name = name ? name : dev->full_name;
+
return 0;
}
@@ -569,11 +570,16 @@ int of_address_to_resource(struct device_node *dev, int index,
const __be32 *addrp;
u64 size;
unsigned int flags;
+ const char *name = NULL;
addrp = of_get_address(dev, index, &size, &flags);
if (addrp == NULL)
return -EINVAL;
- return __of_address_to_resource(dev, addrp, size, flags, r);
+
+ /* Get optional "reg-names" property to add a name to a resource */
+ of_property_read_string_index(dev, "reg-names", index, &name);
+
+ return __of_address_to_resource(dev, addrp, size, flags, name, r);
}
EXPORT_SYMBOL_GPL(of_address_to_resource);
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 9b6588ef067..133908a6fd8 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -752,7 +752,7 @@ int of_property_read_string_index(struct device_node *np, const char *propname,
for (i = 0; total < prop->length; total += l, p += l) {
l = strlen(p) + 1;
- if ((*p != 0) && (i++ == index)) {
+ if (i++ == index) {
*output = p;
return 0;
}
@@ -790,11 +790,9 @@ int of_property_count_strings(struct device_node *np, const char *propname)
p = prop->value;
- for (i = 0; total < prop->length; total += l, p += l) {
+ for (i = 0; total < prop->length; total += l, p += l, i++)
l = strlen(p) + 1;
- if (*p != 0)
- i++;
- }
+
return i;
}
EXPORT_SYMBOL_GPL(of_property_count_strings);
@@ -824,17 +822,19 @@ 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 +851,96 @@ 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;
-
- /* 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;
- }
+ 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;
+ }
- 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;
+ /*
+ * 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;
+ }
}
- list += be32_to_cpup(cells);
- if (list > list_end) {
- pr_debug("%s: insufficient arguments length\n",
- np->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;
+
+ 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
@@ -1159,7 +1161,7 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
if (!of_aliases)
return;
- for_each_property(pp, of_aliases->properties) {
+ for_each_property_of_node(of_aliases, pp) {
const char *start = pp->name;
const char *end = start + strlen(start);
struct device_node *np;
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index fd85fa298e0..ea2bd1be264 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -18,10 +18,12 @@
#include <linux/errno.h>
#include <linux/slab.h>
+#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
#ifdef CONFIG_PPC
#include <asm/machdep.h>
#endif /* CONFIG_PPC */
+#include <asm/setup.h>
#include <asm/page.h>
char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
@@ -107,7 +109,7 @@ int of_fdt_is_compatible(struct boot_param_header *blob,
* of_fdt_match - Return true if node matches a list of compatible values
*/
int of_fdt_match(struct boot_param_header *blob, unsigned long node,
- const char **compat)
+ const char *const *compat)
{
unsigned int tmp, score = 0;
@@ -541,7 +543,7 @@ int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
/**
* of_flat_dt_match - Return true if node matches a list of compatible values
*/
-int __init of_flat_dt_match(unsigned long node, const char **compat)
+int __init of_flat_dt_match(unsigned long node, const char *const *compat)
{
return of_fdt_match(initial_boot_params, node, compat);
}
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index ef0105fa52b..7e62d15d60f 100644
--- a/drivers/of/gpio.c
+++ b/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);
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 791270b8bd1..9cf00602f56 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -26,11 +26,6 @@
#include <linux/string.h>
#include <linux/slab.h>
-/* For archs that don't support NO_IRQ (such as x86), provide a dummy value */
-#ifndef NO_IRQ
-#define NO_IRQ 0
-#endif
-
/**
* irq_of_parse_and_map - Parse and map an interrupt into linux virq space
* @device: Device node of the device whose interrupt is to be mapped
@@ -44,7 +39,7 @@ unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
struct of_irq oirq;
if (of_irq_map_one(dev, index, &oirq))
- return NO_IRQ;
+ return 0;
return irq_create_of_mapping(oirq.controller, oirq.specifier,
oirq.size);
@@ -345,10 +340,19 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
/* Only dereference the resource if both the
* resource and the irq are valid. */
- if (r && irq != NO_IRQ) {
+ if (r && irq) {
+ const char *name = NULL;
+
+ /*
+ * Get optional "interrupts-names" property to add a name
+ * to the resource.
+ */
+ of_property_read_string_index(dev, "interrupt-names", index,
+ &name);
+
r->start = r->end = irq;
r->flags = IORESOURCE_IRQ;
- r->name = dev->full_name;
+ r->name = name ? name : dev->full_name;
}
return irq;
@@ -363,7 +367,7 @@ int of_irq_count(struct device_node *dev)
{
int nr = 0;
- while (of_irq_to_resource(dev, nr, NULL) != NO_IRQ)
+ while (of_irq_to_resource(dev, nr, NULL))
nr++;
return nr;
@@ -383,7 +387,7 @@ int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
int i;
for (i = 0; i < nr_irqs; i++, res++)
- if (of_irq_to_resource(dev, i, res) == NO_IRQ)
+ if (!of_irq_to_resource(dev, i, res))
break;
return i;
@@ -424,6 +428,8 @@ void __init of_irq_init(const struct of_device_id *matches)
desc->dev = np;
desc->interrupt_parent = of_irq_find_parent(np);
+ if (desc->interrupt_parent == np)
+ desc->interrupt_parent = NULL;
list_add_tail(&desc->list, &intc_desc_list);
}
diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
index bc5b3990f6e..07cc1d678e4 100644
--- a/drivers/of/pdt.c
+++ b/drivers/of/pdt.c
@@ -229,7 +229,7 @@ static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
return ret;
}
-static void *kernel_tree_alloc(u64 size, u64 align)
+static void * __init kernel_tree_alloc(u64 size, u64 align)
{
return prom_early_alloc(size);
}
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index cbd5d701c7e..63b3ec48c20 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -314,7 +314,7 @@ static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *l
if (!lookup)
return NULL;
- for(; lookup->name != NULL; lookup++) {
+ for(; lookup->compatible != NULL; lookup++) {
if (!of_device_is_compatible(np, lookup->compatible))
continue;
if (of_address_to_resource(np, 0, &res))
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
new file mode 100644
index 00000000000..9d2b4803a9d
--- /dev/null
+++ b/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);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 18:47:25 +0000