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-rw-r--r--roms/u-boot/drivers/core/device.c1171
1 files changed, 1171 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/core/device.c b/roms/u-boot/drivers/core/device.c
new file mode 100644
index 000000000..cb960f8ec
--- /dev/null
+++ b/roms/u-boot/drivers/core/device.c
@@ -0,0 +1,1171 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Device manager
+ *
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <log.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include <clk.h>
+#include <fdtdec.h>
+#include <fdt_support.h>
+#include <malloc.h>
+#include <asm/cache.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/of_access.h>
+#include <dm/pinctrl.h>
+#include <dm/platdata.h>
+#include <dm/read.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/util.h>
+#include <linux/err.h>
+#include <linux/list.h>
+#include <power-domain.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int device_bind_common(struct udevice *parent, const struct driver *drv,
+ const char *name, void *plat,
+ ulong driver_data, ofnode node,
+ uint of_plat_size, struct udevice **devp)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+ int size, ret = 0;
+ bool auto_seq = true;
+ void *ptr;
+
+ if (CONFIG_IS_ENABLED(OF_PLATDATA_NO_BIND))
+ return -ENOSYS;
+
+ if (devp)
+ *devp = NULL;
+ if (!name)
+ return -EINVAL;
+
+ ret = uclass_get(drv->id, &uc);
+ if (ret) {
+ debug("Missing uclass for driver %s\n", drv->name);
+ return ret;
+ }
+
+ dev = calloc(1, sizeof(struct udevice));
+ if (!dev)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dev->sibling_node);
+ INIT_LIST_HEAD(&dev->child_head);
+ INIT_LIST_HEAD(&dev->uclass_node);
+#ifdef CONFIG_DEVRES
+ INIT_LIST_HEAD(&dev->devres_head);
+#endif
+ dev_set_plat(dev, plat);
+ dev->driver_data = driver_data;
+ dev->name = name;
+ dev_set_ofnode(dev, node);
+ dev->parent = parent;
+ dev->driver = drv;
+ dev->uclass = uc;
+
+ dev->seq_ = -1;
+ if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
+ (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS)) {
+ /*
+ * Some devices, such as a SPI bus, I2C bus and serial ports
+ * are numbered using aliases.
+ */
+ if (CONFIG_IS_ENABLED(OF_CONTROL) &&
+ !CONFIG_IS_ENABLED(OF_PLATDATA)) {
+ if (uc->uc_drv->name && ofnode_valid(node)) {
+ if (!dev_read_alias_seq(dev, &dev->seq_))
+ auto_seq = false;
+ }
+ }
+ }
+ if (auto_seq && !(uc->uc_drv->flags & DM_UC_FLAG_NO_AUTO_SEQ))
+ dev->seq_ = uclass_find_next_free_seq(uc);
+
+ /* Check if we need to allocate plat */
+ if (drv->plat_auto) {
+ bool alloc = !plat;
+
+ /*
+ * For of-platdata, we try use the existing data, but if
+ * plat_auto is larger, we must allocate a new space
+ */
+ if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
+ if (of_plat_size)
+ dev_or_flags(dev, DM_FLAG_OF_PLATDATA);
+ if (of_plat_size < drv->plat_auto)
+ alloc = true;
+ }
+ if (alloc) {
+ dev_or_flags(dev, DM_FLAG_ALLOC_PDATA);
+ ptr = calloc(1, drv->plat_auto);
+ if (!ptr) {
+ ret = -ENOMEM;
+ goto fail_alloc1;
+ }
+
+ /*
+ * For of-platdata, copy the old plat into the new
+ * space
+ */
+ if (CONFIG_IS_ENABLED(OF_PLATDATA) && plat)
+ memcpy(ptr, plat, of_plat_size);
+ dev_set_plat(dev, ptr);
+ }
+ }
+
+ size = uc->uc_drv->per_device_plat_auto;
+ if (size) {
+ dev_or_flags(dev, DM_FLAG_ALLOC_UCLASS_PDATA);
+ ptr = calloc(1, size);
+ if (!ptr) {
+ ret = -ENOMEM;
+ goto fail_alloc2;
+ }
+ dev_set_uclass_plat(dev, ptr);
+ }
+
+ if (parent) {
+ size = parent->driver->per_child_plat_auto;
+ if (!size)
+ size = parent->uclass->uc_drv->per_child_plat_auto;
+ if (size) {
+ dev_or_flags(dev, DM_FLAG_ALLOC_PARENT_PDATA);
+ ptr = calloc(1, size);
+ if (!ptr) {
+ ret = -ENOMEM;
+ goto fail_alloc3;
+ }
+ dev_set_parent_plat(dev, ptr);
+ }
+ /* put dev into parent's successor list */
+ list_add_tail(&dev->sibling_node, &parent->child_head);
+ }
+
+ ret = uclass_bind_device(dev);
+ if (ret)
+ goto fail_uclass_bind;
+
+ /* if we fail to bind we remove device from successors and free it */
+ if (drv->bind) {
+ ret = drv->bind(dev);
+ if (ret)
+ goto fail_bind;
+ }
+ if (parent && parent->driver->child_post_bind) {
+ ret = parent->driver->child_post_bind(dev);
+ if (ret)
+ goto fail_child_post_bind;
+ }
+ if (uc->uc_drv->post_bind) {
+ ret = uc->uc_drv->post_bind(dev);
+ if (ret)
+ goto fail_uclass_post_bind;
+ }
+
+ if (parent)
+ pr_debug("Bound device %s to %s\n", dev->name, parent->name);
+ if (devp)
+ *devp = dev;
+
+ dev_or_flags(dev, DM_FLAG_BOUND);
+
+ return 0;
+
+fail_uclass_post_bind:
+ /* There is no child unbind() method, so no clean-up required */
+fail_child_post_bind:
+ if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+ if (drv->unbind && drv->unbind(dev)) {
+ dm_warn("unbind() method failed on dev '%s' on error path\n",
+ dev->name);
+ }
+ }
+
+fail_bind:
+ if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+ if (uclass_unbind_device(dev)) {
+ dm_warn("Failed to unbind dev '%s' on error path\n",
+ dev->name);
+ }
+ }
+fail_uclass_bind:
+ if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+ list_del(&dev->sibling_node);
+ if (dev_get_flags(dev) & DM_FLAG_ALLOC_PARENT_PDATA) {
+ free(dev_get_parent_plat(dev));
+ dev_set_parent_plat(dev, NULL);
+ }
+ }
+fail_alloc3:
+ if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+ if (dev_get_flags(dev) & DM_FLAG_ALLOC_UCLASS_PDATA) {
+ free(dev_get_uclass_plat(dev));
+ dev_set_uclass_plat(dev, NULL);
+ }
+ }
+fail_alloc2:
+ if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+ if (dev_get_flags(dev) & DM_FLAG_ALLOC_PDATA) {
+ free(dev_get_plat(dev));
+ dev_set_plat(dev, NULL);
+ }
+ }
+fail_alloc1:
+ devres_release_all(dev);
+
+ free(dev);
+
+ return ret;
+}
+
+int device_bind_with_driver_data(struct udevice *parent,
+ const struct driver *drv, const char *name,
+ ulong driver_data, ofnode node,
+ struct udevice **devp)
+{
+ return device_bind_common(parent, drv, name, NULL, driver_data, node,
+ 0, devp);
+}
+
+int device_bind(struct udevice *parent, const struct driver *drv,
+ const char *name, void *plat, ofnode node,
+ struct udevice **devp)
+{
+ return device_bind_common(parent, drv, name, plat, 0, node, 0,
+ devp);
+}
+
+int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
+ const struct driver_info *info, struct udevice **devp)
+{
+ struct driver *drv;
+ uint plat_size = 0;
+ int ret;
+
+ drv = lists_driver_lookup_name(info->name);
+ if (!drv)
+ return -ENOENT;
+ if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
+ return -EPERM;
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+ plat_size = info->plat_size;
+#endif
+ ret = device_bind_common(parent, drv, info->name, (void *)info->plat, 0,
+ ofnode_null(), plat_size, devp);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+
+int device_reparent(struct udevice *dev, struct udevice *new_parent)
+{
+ struct udevice *pos, *n;
+
+ assert(dev);
+ assert(new_parent);
+
+ list_for_each_entry_safe(pos, n, &dev->parent->child_head,
+ sibling_node) {
+ if (pos->driver != dev->driver)
+ continue;
+
+ list_del(&dev->sibling_node);
+ list_add_tail(&dev->sibling_node, &new_parent->child_head);
+ dev->parent = new_parent;
+
+ break;
+ }
+
+ return 0;
+}
+
+static void *alloc_priv(int size, uint flags)
+{
+ void *priv;
+
+ if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
+ size = ROUND(size, ARCH_DMA_MINALIGN);
+ priv = memalign(ARCH_DMA_MINALIGN, size);
+ if (priv) {
+ memset(priv, '\0', size);
+
+ /*
+ * Ensure that the zero bytes are flushed to memory.
+ * This prevents problems if the driver uses this as
+ * both an input and an output buffer:
+ *
+ * 1. Zeroes written to buffer (here) and sit in the
+ * cache
+ * 2. Driver issues a read command to DMA
+ * 3. CPU runs out of cache space and evicts some cache
+ * data in the buffer, writing zeroes to RAM from
+ * the memset() above
+ * 4. DMA completes
+ * 5. Buffer now has some DMA data and some zeroes
+ * 6. Data being read is now incorrect
+ *
+ * To prevent this, ensure that the cache is clean
+ * within this range at the start. The driver can then
+ * use normal flush-after-write, invalidate-before-read
+ * procedures.
+ *
+ * TODO(sjg@chromium.org): Drop this microblaze
+ * exception.
+ */
+#ifndef CONFIG_MICROBLAZE
+ flush_dcache_range((ulong)priv, (ulong)priv + size);
+#endif
+ }
+ } else {
+ priv = calloc(1, size);
+ }
+
+ return priv;
+}
+
+/**
+ * device_alloc_priv() - Allocate priv/plat data required by the device
+ *
+ * @dev: Device to process
+ * @return 0 if OK, -ENOMEM if out of memory
+ */
+static int device_alloc_priv(struct udevice *dev)
+{
+ const struct driver *drv;
+ void *ptr;
+ int size;
+
+ drv = dev->driver;
+ assert(drv);
+
+ /* Allocate private data if requested and not reentered */
+ if (drv->priv_auto && !dev_get_priv(dev)) {
+ ptr = alloc_priv(drv->priv_auto, drv->flags);
+ if (!ptr)
+ return -ENOMEM;
+ dev_set_priv(dev, ptr);
+ }
+
+ /* Allocate private data if requested and not reentered */
+ size = dev->uclass->uc_drv->per_device_auto;
+ if (size && !dev_get_uclass_priv(dev)) {
+ ptr = alloc_priv(size, dev->uclass->uc_drv->flags);
+ if (!ptr)
+ return -ENOMEM;
+ dev_set_uclass_priv(dev, ptr);
+ }
+
+ /* Allocate parent data for this child */
+ if (dev->parent) {
+ size = dev->parent->driver->per_child_auto;
+ if (!size)
+ size = dev->parent->uclass->uc_drv->per_child_auto;
+ if (size && !dev_get_parent_priv(dev)) {
+ ptr = alloc_priv(size, drv->flags);
+ if (!ptr)
+ return -ENOMEM;
+ dev_set_parent_priv(dev, ptr);
+ }
+ }
+
+ return 0;
+}
+
+int device_of_to_plat(struct udevice *dev)
+{
+ const struct driver *drv;
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)
+ return 0;
+
+ /*
+ * This is not needed if binding is disabled, since data is allocated
+ * at build time.
+ */
+ if (!CONFIG_IS_ENABLED(OF_PLATDATA_NO_BIND)) {
+ /* Ensure all parents have ofdata */
+ if (dev->parent) {
+ ret = device_of_to_plat(dev->parent);
+ if (ret)
+ goto fail;
+
+ /*
+ * The device might have already been probed during
+ * the call to device_probe() on its parent device
+ * (e.g. PCI bridge devices). Test the flags again
+ * so that we don't mess up the device.
+ */
+ if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)
+ return 0;
+ }
+
+ ret = device_alloc_priv(dev);
+ if (ret)
+ goto fail;
+ }
+ drv = dev->driver;
+ assert(drv);
+
+ if (drv->of_to_plat &&
+ (CONFIG_IS_ENABLED(OF_PLATDATA) || dev_has_ofnode(dev))) {
+ ret = drv->of_to_plat(dev);
+ if (ret)
+ goto fail;
+ }
+
+ dev_or_flags(dev, DM_FLAG_PLATDATA_VALID);
+
+ return 0;
+fail:
+ device_free(dev);
+
+ return ret;
+}
+
+/**
+ * device_get_dma_constraints() - Populate device's DMA constraints
+ *
+ * Gets a device's DMA constraints from firmware. This information is later
+ * used by drivers to translate physcal addresses to the device's bus address
+ * space. For now only device-tree is supported.
+ *
+ * @dev: Pointer to target device
+ * Return: 0 if OK or if no DMA constraints were found, error otherwise
+ */
+static int device_get_dma_constraints(struct udevice *dev)
+{
+ struct udevice *parent = dev->parent;
+ phys_addr_t cpu = 0;
+ dma_addr_t bus = 0;
+ u64 size = 0;
+ int ret;
+
+ if (!CONFIG_IS_ENABLED(DM_DMA) || !parent || !dev_has_ofnode(parent))
+ return 0;
+
+ /*
+ * We start parsing for dma-ranges from the device's bus node. This is
+ * specially important on nested buses.
+ */
+ ret = dev_get_dma_range(parent, &cpu, &bus, &size);
+ /* Don't return an error if no 'dma-ranges' were found */
+ if (ret && ret != -ENOENT) {
+ dm_warn("%s: failed to get DMA range, %d\n", dev->name, ret);
+ return ret;
+ }
+
+ dev_set_dma_offset(dev, cpu - bus);
+
+ return 0;
+}
+
+int device_probe(struct udevice *dev)
+{
+ const struct driver *drv;
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ if (dev_get_flags(dev) & DM_FLAG_ACTIVATED)
+ return 0;
+
+ drv = dev->driver;
+ assert(drv);
+
+ ret = device_of_to_plat(dev);
+ if (ret)
+ goto fail;
+
+ /* Ensure all parents are probed */
+ if (dev->parent) {
+ ret = device_probe(dev->parent);
+ if (ret)
+ goto fail;
+
+ /*
+ * The device might have already been probed during
+ * the call to device_probe() on its parent device
+ * (e.g. PCI bridge devices). Test the flags again
+ * so that we don't mess up the device.
+ */
+ if (dev_get_flags(dev) & DM_FLAG_ACTIVATED)
+ return 0;
+ }
+
+ dev_or_flags(dev, DM_FLAG_ACTIVATED);
+
+ /*
+ * Process pinctrl for everything except the root device, and
+ * continue regardless of the result of pinctrl. Don't process pinctrl
+ * settings for pinctrl devices since the device may not yet be
+ * probed.
+ *
+ * This call can produce some non-intuitive results. For example, on an
+ * x86 device where dev is the main PCI bus, the pinctrl device may be
+ * child or grandchild of that bus, meaning that the child will be
+ * probed here. If the child happens to be the P2SB and the pinctrl
+ * device is a child of that, then both the pinctrl and P2SB will be
+ * probed by this call. This works because the DM_FLAG_ACTIVATED flag
+ * is set just above. However, the PCI bus' probe() method and
+ * associated uclass methods have not yet been called.
+ */
+ if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
+ pinctrl_select_state(dev, "default");
+
+ if (CONFIG_IS_ENABLED(POWER_DOMAIN) && dev->parent &&
+ (device_get_uclass_id(dev) != UCLASS_POWER_DOMAIN) &&
+ !(drv->flags & DM_FLAG_DEFAULT_PD_CTRL_OFF)) {
+ ret = dev_power_domain_on(dev);
+ if (ret)
+ goto fail;
+ }
+
+ ret = device_get_dma_constraints(dev);
+ if (ret)
+ goto fail;
+
+ ret = uclass_pre_probe_device(dev);
+ if (ret)
+ goto fail;
+
+ if (dev->parent && dev->parent->driver->child_pre_probe) {
+ ret = dev->parent->driver->child_pre_probe(dev);
+ if (ret)
+ goto fail;
+ }
+
+ /* Only handle devices that have a valid ofnode */
+ if (dev_has_ofnode(dev)) {
+ /*
+ * Process 'assigned-{clocks/clock-parents/clock-rates}'
+ * properties
+ */
+ ret = clk_set_defaults(dev, 0);
+ if (ret)
+ goto fail;
+ }
+
+ if (drv->probe) {
+ ret = drv->probe(dev);
+ if (ret)
+ goto fail;
+ }
+
+ ret = uclass_post_probe_device(dev);
+ if (ret)
+ goto fail_uclass;
+
+ if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
+ pinctrl_select_state(dev, "default");
+
+ return 0;
+fail_uclass:
+ if (device_remove(dev, DM_REMOVE_NORMAL)) {
+ dm_warn("%s: Device '%s' failed to remove on error path\n",
+ __func__, dev->name);
+ }
+fail:
+ dev_bic_flags(dev, DM_FLAG_ACTIVATED);
+
+ device_free(dev);
+
+ return ret;
+}
+
+void *dev_get_plat(const struct udevice *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device\n", __func__);
+ return NULL;
+ }
+
+ return dm_priv_to_rw(dev->plat_);
+}
+
+void *dev_get_parent_plat(const struct udevice *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device\n", __func__);
+ return NULL;
+ }
+
+ return dm_priv_to_rw(dev->parent_plat_);
+}
+
+void *dev_get_uclass_plat(const struct udevice *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device\n", __func__);
+ return NULL;
+ }
+
+ return dm_priv_to_rw(dev->uclass_plat_);
+}
+
+void *dev_get_priv(const struct udevice *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device\n", __func__);
+ return NULL;
+ }
+
+ return dm_priv_to_rw(dev->priv_);
+}
+
+void *dev_get_uclass_priv(const struct udevice *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device\n", __func__);
+ return NULL;
+ }
+
+ return dm_priv_to_rw(dev->uclass_priv_);
+}
+
+void *dev_get_parent_priv(const struct udevice *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device\n", __func__);
+ return NULL;
+ }
+
+ return dm_priv_to_rw(dev->parent_priv_);
+}
+
+static int device_get_device_tail(struct udevice *dev, int ret,
+ struct udevice **devp)
+{
+ if (ret)
+ return ret;
+
+ ret = device_probe(dev);
+ if (ret)
+ return ret;
+
+ *devp = dev;
+
+ return 0;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+/**
+ * device_find_by_ofnode() - Return device associated with given ofnode
+ *
+ * The returned device is *not* activated.
+ *
+ * @node: The ofnode for which a associated device should be looked up
+ * @devp: Pointer to structure to hold the found device
+ * Return: 0 if OK, -ve on error
+ */
+static int device_find_by_ofnode(ofnode node, struct udevice **devp)
+{
+ struct uclass *uc;
+ struct udevice *dev;
+ int ret;
+
+ list_for_each_entry(uc, gd->uclass_root, sibling_node) {
+ ret = uclass_find_device_by_ofnode(uc->uc_drv->id, node,
+ &dev);
+ if (!ret || dev) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+#endif
+
+int device_get_child(const struct udevice *parent, int index,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (!index--)
+ return device_get_device_tail(dev, 0, devp);
+ }
+
+ return -ENODEV;
+}
+
+int device_get_child_count(const struct udevice *parent)
+{
+ struct udevice *dev;
+ int count = 0;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node)
+ count++;
+
+ return count;
+}
+
+int device_find_child_by_seq(const struct udevice *parent, int seq,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (dev->seq_ == seq) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_get_child_by_seq(const struct udevice *parent, int seq,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ ret = device_find_child_by_seq(parent, seq, &dev);
+
+ return device_get_device_tail(dev, ret, devp);
+}
+
+int device_find_child_by_of_offset(const struct udevice *parent, int of_offset,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (dev_of_offset(dev) == of_offset) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_get_child_by_of_offset(const struct udevice *parent, int node,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ ret = device_find_child_by_of_offset(parent, node, &dev);
+ return device_get_device_tail(dev, ret, devp);
+}
+
+static struct udevice *_device_find_global_by_ofnode(struct udevice *parent,
+ ofnode ofnode)
+{
+ struct udevice *dev, *found;
+
+ if (ofnode_equal(dev_ofnode(parent), ofnode))
+ return parent;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ found = _device_find_global_by_ofnode(dev, ofnode);
+ if (found)
+ return found;
+ }
+
+ return NULL;
+}
+
+int device_find_global_by_ofnode(ofnode ofnode, struct udevice **devp)
+{
+ *devp = _device_find_global_by_ofnode(gd->dm_root, ofnode);
+
+ return *devp ? 0 : -ENOENT;
+}
+
+int device_get_global_by_ofnode(ofnode ofnode, struct udevice **devp)
+{
+ struct udevice *dev;
+
+ dev = _device_find_global_by_ofnode(gd->dm_root, ofnode);
+ return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
+}
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+int device_get_by_ofplat_idx(uint idx, struct udevice **devp)
+{
+ struct udevice *dev;
+
+ if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
+ struct udevice *base = ll_entry_start(struct udevice, udevice);
+
+ dev = base + idx;
+ } else {
+ struct driver_rt *drt = gd_dm_driver_rt() + idx;
+
+ dev = drt->dev;
+ }
+ *devp = NULL;
+
+ return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
+}
+#endif
+
+int device_find_first_child(const struct udevice *parent, struct udevice **devp)
+{
+ if (list_empty(&parent->child_head)) {
+ *devp = NULL;
+ } else {
+ *devp = list_first_entry(&parent->child_head, struct udevice,
+ sibling_node);
+ }
+
+ return 0;
+}
+
+int device_find_next_child(struct udevice **devp)
+{
+ struct udevice *dev = *devp;
+ struct udevice *parent = dev->parent;
+
+ if (list_is_last(&dev->sibling_node, &parent->child_head)) {
+ *devp = NULL;
+ } else {
+ *devp = list_entry(dev->sibling_node.next, struct udevice,
+ sibling_node);
+ }
+
+ return 0;
+}
+
+int device_find_first_inactive_child(const struct udevice *parent,
+ enum uclass_id uclass_id,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (!device_active(dev) &&
+ device_get_uclass_id(dev) == uclass_id) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_find_first_child_by_uclass(const struct udevice *parent,
+ enum uclass_id uclass_id,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (device_get_uclass_id(dev) == uclass_id) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_find_child_by_name(const struct udevice *parent, const char *name,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (!strcmp(dev->name, name)) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_first_child_err(struct udevice *parent, struct udevice **devp)
+{
+ struct udevice *dev;
+
+ device_find_first_child(parent, &dev);
+ if (!dev)
+ return -ENODEV;
+
+ return device_get_device_tail(dev, 0, devp);
+}
+
+int device_next_child_err(struct udevice **devp)
+{
+ struct udevice *dev = *devp;
+
+ device_find_next_child(&dev);
+ if (!dev)
+ return -ENODEV;
+
+ return device_get_device_tail(dev, 0, devp);
+}
+
+int device_first_child_ofdata_err(struct udevice *parent, struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ device_find_first_child(parent, &dev);
+ if (!dev)
+ return -ENODEV;
+
+ ret = device_of_to_plat(dev);
+ if (ret)
+ return ret;
+
+ *devp = dev;
+
+ return 0;
+}
+
+int device_next_child_ofdata_err(struct udevice **devp)
+{
+ struct udevice *dev = *devp;
+ int ret;
+
+ device_find_next_child(&dev);
+ if (!dev)
+ return -ENODEV;
+
+ ret = device_of_to_plat(dev);
+ if (ret)
+ return ret;
+
+ *devp = dev;
+
+ return 0;
+}
+
+struct udevice *dev_get_parent(const struct udevice *child)
+{
+ return child->parent;
+}
+
+ulong dev_get_driver_data(const struct udevice *dev)
+{
+ return dev->driver_data;
+}
+
+const void *dev_get_driver_ops(const struct udevice *dev)
+{
+ if (!dev || !dev->driver->ops)
+ return NULL;
+
+ return dev->driver->ops;
+}
+
+enum uclass_id device_get_uclass_id(const struct udevice *dev)
+{
+ return dev->uclass->uc_drv->id;
+}
+
+const char *dev_get_uclass_name(const struct udevice *dev)
+{
+ if (!dev)
+ return NULL;
+
+ return dev->uclass->uc_drv->name;
+}
+
+bool device_has_children(const struct udevice *dev)
+{
+ return !list_empty(&dev->child_head);
+}
+
+bool device_has_active_children(const struct udevice *dev)
+{
+ struct udevice *child;
+
+ for (device_find_first_child(dev, &child);
+ child;
+ device_find_next_child(&child)) {
+ if (device_active(child))
+ return true;
+ }
+
+ return false;
+}
+
+bool device_is_last_sibling(const struct udevice *dev)
+{
+ struct udevice *parent = dev->parent;
+
+ if (!parent)
+ return false;
+ return list_is_last(&dev->sibling_node, &parent->child_head);
+}
+
+void device_set_name_alloced(struct udevice *dev)
+{
+ dev_or_flags(dev, DM_FLAG_NAME_ALLOCED);
+}
+
+int device_set_name(struct udevice *dev, const char *name)
+{
+ name = strdup(name);
+ if (!name)
+ return -ENOMEM;
+ dev->name = name;
+ device_set_name_alloced(dev);
+
+ return 0;
+}
+
+void dev_set_priv(struct udevice *dev, void *priv)
+{
+ dev->priv_ = priv;
+}
+
+void dev_set_parent_priv(struct udevice *dev, void *parent_priv)
+{
+ dev->parent_priv_ = parent_priv;
+}
+
+void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv)
+{
+ dev->uclass_priv_ = uclass_priv;
+}
+
+void dev_set_plat(struct udevice *dev, void *plat)
+{
+ dev->plat_ = plat;
+}
+
+void dev_set_parent_plat(struct udevice *dev, void *parent_plat)
+{
+ dev->parent_plat_ = parent_plat;
+}
+
+void dev_set_uclass_plat(struct udevice *dev, void *uclass_plat)
+{
+ dev->uclass_plat_ = uclass_plat;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+bool device_is_compatible(const struct udevice *dev, const char *compat)
+{
+ return ofnode_device_is_compatible(dev_ofnode(dev), compat);
+}
+
+bool of_machine_is_compatible(const char *compat)
+{
+ const void *fdt = gd->fdt_blob;
+
+ return !fdt_node_check_compatible(fdt, 0, compat);
+}
+
+int dev_disable_by_path(const char *path)
+{
+ struct uclass *uc;
+ ofnode node = ofnode_path(path);
+ struct udevice *dev;
+ int ret = 1;
+
+ if (!of_live_active())
+ return -ENOSYS;
+
+ list_for_each_entry(uc, gd->uclass_root, sibling_node) {
+ ret = uclass_find_device_by_ofnode(uc->uc_drv->id, node, &dev);
+ if (!ret)
+ break;
+ }
+
+ if (ret)
+ return ret;
+
+ ret = device_remove(dev, DM_REMOVE_NORMAL);
+ if (ret)
+ return ret;
+
+ ret = device_unbind(dev);
+ if (ret)
+ return ret;
+
+ return ofnode_set_enabled(node, false);
+}
+
+int dev_enable_by_path(const char *path)
+{
+ ofnode node = ofnode_path(path);
+ ofnode pnode = ofnode_get_parent(node);
+ struct udevice *parent;
+ int ret = 1;
+
+ if (!of_live_active())
+ return -ENOSYS;
+
+ ret = device_find_by_ofnode(pnode, &parent);
+ if (ret)
+ return ret;
+
+ ret = ofnode_set_enabled(node, true);
+ if (ret)
+ return ret;
+
+ return lists_bind_fdt(parent, node, NULL, false);
+}
+#endif
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
+static struct udevice_rt *dev_get_rt(const struct udevice *dev)
+{
+ struct udevice *base = ll_entry_start(struct udevice, udevice);
+ int idx = dev - base;
+
+ struct udevice_rt *urt = gd_dm_udevice_rt() + idx;
+
+ return urt;
+}
+
+u32 dev_get_flags(const struct udevice *dev)
+{
+ const struct udevice_rt *urt = dev_get_rt(dev);
+
+ return urt->flags_;
+}
+
+void dev_or_flags(const struct udevice *dev, u32 or)
+{
+ struct udevice_rt *urt = dev_get_rt(dev);
+
+ urt->flags_ |= or;
+}
+
+void dev_bic_flags(const struct udevice *dev, u32 bic)
+{
+ struct udevice_rt *urt = dev_get_rt(dev);
+
+ urt->flags_ &= ~bic;
+}
+#endif /* OF_PLATDATA_RT */