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Device properties framework updates for 5.4-rc1 

Improve software node support (Heikki Krogerus) and clean up two
 assorted pieces of code (Andy Shevchenko, Geert Uytterhoeven).
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Merge tag 'devprop-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull device properties framework updates from Rafael Wysocki:
 "Improve software node support (Heikki Krogerus) and clean up two
  assorted pieces of code (Andy Shevchenko, Geert Uytterhoeven)"

* tag 'devprop-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  software node: Initialize the return value in software_node_find_by_name()
  software node: Initialize the return value in software_node_to_swnode()
  ACPI / property: Fix acpi_graph_get_remote_endpoint() name in kerneldoc
  device property: Remove duplicate test for NULL
  platform/x86: intel_cht_int33fe: Use new API to gain access to the role switch
  usb: roles: intel_xhci: Supplying software node for the role mux
  software node: Add software_node_find_by_name()
This commit is contained in:
Linus Torvalds 2019-09-17 19:39:59 -07:00
parent d2aaa49e28 016049a816
commit 35f7a95266
6 changed files with 78 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/property.c
View File

@ -1210,7 +1210,7 @@ static struct fwnode_handle *acpi_graph_get_child_prop_value(
/**
* acpi_graph_get_remote_enpoint - Parses and returns remote end of an endpoint
* acpi_graph_get_remote_endpoint - Parses and returns remote end of an endpoint
* @fwnode: Endpoint firmware node pointing to a remote device
* @endpoint: Firmware node of remote endpoint is filled here if not %NULL
*

39
drivers/base/swnode.c
View File

@ -51,7 +51,7 @@ EXPORT_SYMBOL_GPL(is_software_node);
static struct swnode *
software_node_to_swnode(const struct software_node *node)
{
struct swnode *swnode;
struct swnode *swnode = NULL;
struct kobject *k;
if (!node)
@ -620,6 +620,43 @@ static const struct fwnode_operations software_node_ops = {
/* -------------------------------------------------------------------------- */
/**
* software_node_find_by_name - Find software node by name
* @parent: Parent of the software node
* @name: Name of the software node
*
* The function will find a node that is child of @parent and that is named
* @name. If no node is found, the function returns NULL.
*
* NOTE: you will need to drop the reference with fwnode_handle_put() after use.
*/
const struct software_node *
software_node_find_by_name(const struct software_node *parent, const char *name)
{
struct swnode *swnode = NULL;
struct kobject *k;
if (!name)
return NULL;
spin_lock(&swnode_kset->list_lock);
list_for_each_entry(k, &swnode_kset->list, entry) {
swnode = kobj_to_swnode(k);
if (parent == swnode->node->parent && swnode->node->name &&
!strcmp(name, swnode->node->name)) {
kobject_get(&swnode->kobj);
break;
}
swnode = NULL;
}
spin_unlock(&swnode_kset->list_lock);
return swnode ? swnode->node : NULL;
}
EXPORT_SYMBOL_GPL(software_node_find_by_name);
static int
software_node_register_properties(struct software_node *node,
const struct property_entry *properties)

57
drivers/platform/x86/intel_cht_int33fe.c
View File

@ -34,7 +34,6 @@ enum {
INT33FE_NODE_MAX17047,
INT33FE_NODE_PI3USB30532,
INT33FE_NODE_DISPLAYPORT,
INT33FE_NODE_ROLE_SWITCH,
INT33FE_NODE_USB_CONNECTOR,
INT33FE_NODE_MAX,
};
@ -45,7 +44,6 @@ struct cht_int33fe_data {
struct i2c_client *pi3usb30532;
struct fwnode_handle *dp;
struct fwnode_handle *mux;
};
static const struct software_node nodes[];
@ -139,46 +137,10 @@ static const struct software_node nodes[] = {
{ "max17047", NULL, max17047_props },
{ "pi3usb30532" },
{ "displayport" },
{ "usb-role-switch" },
{ "connector", &nodes[0], usb_connector_props, usb_connector_refs },
{ }
};
static int cht_int33fe_setup_mux(struct cht_int33fe_data *data)
{
struct fwnode_handle *fwnode;
struct device *dev;
struct device *p;
fwnode = software_node_fwnode(&nodes[INT33FE_NODE_ROLE_SWITCH]);
if (!fwnode)
return -ENODEV;
/* First finding the platform device */
p = bus_find_device_by_name(&platform_bus_type, NULL,
"intel_xhci_usb_sw");
if (!p)
return -EPROBE_DEFER;
/* Then the mux child device */
dev = device_find_child_by_name(p, "intel_xhci_usb_sw-role-switch");
put_device(p);
if (!dev)
return -EPROBE_DEFER;
/* If there already is a node for the mux, using that one. */
if (dev->fwnode)
fwnode_remove_software_node(fwnode);
else
dev->fwnode = fwnode;
data->mux = fwnode_handle_get(dev->fwnode);
put_device(dev);
mux_ref.node = to_software_node(data->mux);
return 0;
}
static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
{
struct fwnode_handle *fwnode;
@ -211,10 +173,9 @@ static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
{
software_node_unregister_nodes(nodes);
if (data->mux) {
fwnode_handle_put(data->mux);
if (mux_ref.node) {
fwnode_handle_put(software_node_fwnode(mux_ref.node));
mux_ref.node = NULL;
data->mux = NULL;
}
if (data->dp) {
@ -235,14 +196,16 @@ static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
/* The devices that are not created in this driver need extra steps. */
/*
* There is no ACPI device node for the USB role mux, so we need to find
* the mux device and assign our node directly to it. That means we
* depend on the mux driver. This function will return -PROBE_DEFER
* until the mux device is registered.
* There is no ACPI device node for the USB role mux, so we need to wait
* until the mux driver has created software node for the mux device.
* It means we depend on the mux driver. This function will return
* -EPROBE_DEFER until the mux device is registered.
*/
ret = cht_int33fe_setup_mux(data);
if (ret)
mux_ref.node = software_node_find_by_name(NULL, "intel-xhci-usb-sw");
if (!mux_ref.node) {
ret = -EPROBE_DEFER;
goto err_remove_nodes;
}
/*
* The DP connector does have ACPI device node. In this case we can just

27
drivers/usb/roles/intel-xhci-usb-role-switch.c
View File

@ -39,6 +39,10 @@ struct intel_xhci_usb_data {
void __iomem *base;
};
static const struct software_node intel_xhci_usb_node = {
"intel-xhci-usb-sw",
};
static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role)
{
struct intel_xhci_usb_data *data = dev_get_drvdata(dev);
@ -122,17 +126,13 @@ static enum usb_role intel_xhci_usb_get_role(struct device *dev)
return role;
}
static const struct usb_role_switch_desc sw_desc = {
.set = intel_xhci_usb_set_role,
.get = intel_xhci_usb_get_role,
.allow_userspace_control = true,
};
static int intel_xhci_usb_probe(struct platform_device *pdev)
{
struct usb_role_switch_desc sw_desc = { };
struct device *dev = &pdev->dev;
struct intel_xhci_usb_data *data;
struct resource *res;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
@ -147,9 +147,20 @@ static int intel_xhci_usb_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
ret = software_node_register(&intel_xhci_usb_node);
if (ret)
return ret;
sw_desc.set = intel_xhci_usb_set_role,
sw_desc.get = intel_xhci_usb_get_role,
sw_desc.allow_userspace_control = true,
sw_desc.fwnode = software_node_fwnode(&intel_xhci_usb_node);
data->role_sw = usb_role_switch_register(dev, &sw_desc);
if (IS_ERR(data->role_sw))
if (IS_ERR(data->role_sw)) {
fwnode_handle_put(sw_desc.fwnode);
return PTR_ERR(data->role_sw);
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
@ -164,6 +175,8 @@ static int intel_xhci_usb_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
usb_role_switch_unregister(data->role_sw);
fwnode_handle_put(software_node_fwnode(&intel_xhci_usb_node));
return 0;
}

7
include/linux/fwnode.h
View File

@ -110,10 +110,11 @@ struct fwnode_operations {
(fwnode ? (fwnode_has_op(fwnode, op) ? \
(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \
-EINVAL)
#define fwnode_call_bool_op(fwnode, op, ...) \
(fwnode ? (fwnode_has_op(fwnode, op) ? \
(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false) : \
false)
(fwnode_has_op(fwnode, op) ? \
(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)
#define fwnode_call_ptr_op(fwnode, op, ...) \
(fwnode_has_op(fwnode, op) ? \
(fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)

4
include/linux/property.h
View File

@ -421,6 +421,10 @@ bool is_software_node(const struct fwnode_handle *fwnode);
const struct software_node *to_software_node(struct fwnode_handle *fwnode);
struct fwnode_handle *software_node_fwnode(const struct software_node *node);
const struct software_node *
software_node_find_by_name(const struct software_node *parent,
const char *name);
int software_node_register_nodes(const struct software_node *nodes);
void software_node_unregister_nodes(const struct software_node *nodes);