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248 lines
5.8 KiB
248 lines
5.8 KiB
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
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// Copyright(c) 2015-17 Intel Corporation. |
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#include <linux/acpi.h> |
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#include <linux/of.h> |
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#include <linux/soundwire/sdw.h> |
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#include <linux/soundwire/sdw_type.h> |
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#include "bus.h" |
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#include "sysfs_local.h" |
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static void sdw_slave_release(struct device *dev) |
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{ |
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struct sdw_slave *slave = dev_to_sdw_dev(dev); |
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kfree(slave); |
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} |
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struct device_type sdw_slave_type = { |
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.name = "sdw_slave", |
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.release = sdw_slave_release, |
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.uevent = sdw_slave_uevent, |
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}; |
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int sdw_slave_add(struct sdw_bus *bus, |
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struct sdw_slave_id *id, struct fwnode_handle *fwnode) |
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{ |
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struct sdw_slave *slave; |
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int ret; |
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int i; |
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slave = kzalloc(sizeof(*slave), GFP_KERNEL); |
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if (!slave) |
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return -ENOMEM; |
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/* Initialize data structure */ |
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memcpy(&slave->id, id, sizeof(*id)); |
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slave->dev.parent = bus->dev; |
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slave->dev.fwnode = fwnode; |
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if (id->unique_id == SDW_IGNORED_UNIQUE_ID) { |
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/* name shall be sdw:link:mfg:part:class */ |
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dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x", |
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bus->link_id, id->mfg_id, id->part_id, |
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id->class_id); |
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} else { |
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/* name shall be sdw:link:mfg:part:class:unique */ |
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dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x:%01x", |
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bus->link_id, id->mfg_id, id->part_id, |
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id->class_id, id->unique_id); |
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} |
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slave->dev.bus = &sdw_bus_type; |
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slave->dev.of_node = of_node_get(to_of_node(fwnode)); |
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slave->dev.type = &sdw_slave_type; |
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slave->dev.groups = sdw_slave_status_attr_groups; |
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slave->bus = bus; |
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slave->status = SDW_SLAVE_UNATTACHED; |
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init_completion(&slave->enumeration_complete); |
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init_completion(&slave->initialization_complete); |
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slave->dev_num = 0; |
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init_completion(&slave->probe_complete); |
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slave->probed = false; |
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slave->first_interrupt_done = false; |
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for (i = 0; i < SDW_MAX_PORTS; i++) |
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init_completion(&slave->port_ready[i]); |
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mutex_lock(&bus->bus_lock); |
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list_add_tail(&slave->node, &bus->slaves); |
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mutex_unlock(&bus->bus_lock); |
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ret = device_register(&slave->dev); |
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if (ret) { |
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dev_err(bus->dev, "Failed to add slave: ret %d\n", ret); |
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/* |
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* On err, don't free but drop ref as this will be freed |
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* when release method is invoked. |
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*/ |
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mutex_lock(&bus->bus_lock); |
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list_del(&slave->node); |
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mutex_unlock(&bus->bus_lock); |
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put_device(&slave->dev); |
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return ret; |
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} |
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sdw_slave_debugfs_init(slave); |
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return ret; |
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} |
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EXPORT_SYMBOL(sdw_slave_add); |
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#if IS_ENABLED(CONFIG_ACPI) |
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static bool find_slave(struct sdw_bus *bus, |
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struct acpi_device *adev, |
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struct sdw_slave_id *id) |
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{ |
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u64 addr; |
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unsigned int link_id; |
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acpi_status status; |
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status = acpi_evaluate_integer(adev->handle, |
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METHOD_NAME__ADR, NULL, &addr); |
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if (ACPI_FAILURE(status)) { |
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dev_err(bus->dev, "_ADR resolution failed: %x\n", |
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status); |
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return false; |
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} |
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if (bus->ops->override_adr) |
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addr = bus->ops->override_adr(bus, addr); |
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if (!addr) |
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return false; |
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/* Extract link id from ADR, Bit 51 to 48 (included) */ |
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link_id = SDW_DISCO_LINK_ID(addr); |
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/* Check for link_id match */ |
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if (link_id != bus->link_id) |
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return false; |
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sdw_extract_slave_id(bus, addr, id); |
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return true; |
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} |
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/* |
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* sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node |
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* @bus: SDW bus instance |
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* |
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* Scans Master ACPI node for SDW child Slave devices and registers it. |
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*/ |
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int sdw_acpi_find_slaves(struct sdw_bus *bus) |
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{ |
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struct acpi_device *adev, *parent; |
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struct acpi_device *adev2, *parent2; |
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parent = ACPI_COMPANION(bus->dev); |
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if (!parent) { |
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dev_err(bus->dev, "Can't find parent for acpi bind\n"); |
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return -ENODEV; |
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} |
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list_for_each_entry(adev, &parent->children, node) { |
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struct sdw_slave_id id; |
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struct sdw_slave_id id2; |
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bool ignore_unique_id = true; |
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if (!find_slave(bus, adev, &id)) |
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continue; |
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/* brute-force O(N^2) search for duplicates */ |
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parent2 = parent; |
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list_for_each_entry(adev2, &parent2->children, node) { |
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if (adev == adev2) |
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continue; |
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if (!find_slave(bus, adev2, &id2)) |
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continue; |
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if (id.sdw_version != id2.sdw_version || |
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id.mfg_id != id2.mfg_id || |
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id.part_id != id2.part_id || |
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id.class_id != id2.class_id) |
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continue; |
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if (id.unique_id != id2.unique_id) { |
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dev_dbg(bus->dev, |
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"Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", |
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id.unique_id, id2.unique_id, id.mfg_id, id.part_id); |
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ignore_unique_id = false; |
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} else { |
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dev_err(bus->dev, |
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"Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n", |
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id.unique_id, id2.unique_id, id.mfg_id, id.part_id); |
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return -ENODEV; |
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} |
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} |
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if (ignore_unique_id) |
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id.unique_id = SDW_IGNORED_UNIQUE_ID; |
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/* |
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* don't error check for sdw_slave_add as we want to continue |
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* adding Slaves |
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*/ |
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sdw_slave_add(bus, &id, acpi_fwnode_handle(adev)); |
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} |
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return 0; |
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} |
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#endif |
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/* |
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* sdw_of_find_slaves() - Find Slave devices in master device tree node |
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* @bus: SDW bus instance |
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* |
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* Scans Master DT node for SDW child Slave devices and registers it. |
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*/ |
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int sdw_of_find_slaves(struct sdw_bus *bus) |
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{ |
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struct device *dev = bus->dev; |
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struct device_node *node; |
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for_each_child_of_node(bus->dev->of_node, node) { |
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int link_id, ret, len; |
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unsigned int sdw_version; |
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const char *compat = NULL; |
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struct sdw_slave_id id; |
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const __be32 *addr; |
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compat = of_get_property(node, "compatible", NULL); |
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if (!compat) |
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continue; |
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ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version, |
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&id.mfg_id, &id.part_id, &id.class_id); |
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if (ret != 4) { |
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dev_err(dev, "Invalid compatible string found %s\n", |
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compat); |
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continue; |
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} |
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addr = of_get_property(node, "reg", &len); |
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if (!addr || (len < 2 * sizeof(u32))) { |
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dev_err(dev, "Invalid Link and Instance ID\n"); |
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continue; |
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} |
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link_id = be32_to_cpup(addr++); |
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id.unique_id = be32_to_cpup(addr); |
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id.sdw_version = sdw_version; |
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/* Check for link_id match */ |
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if (link_id != bus->link_id) |
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continue; |
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sdw_slave_add(bus, &id, of_fwnode_handle(node)); |
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} |
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return 0; |
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}
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