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Subject[RFC PATCH 05/21] PCI: endpoint: Add API to get reference to EPC from device-tree
Date
Add of_pci_epc_get() and of_pci_epc_get_by_name() to get reference
to EPC from device-tree. This is added in preparation to define
an endpoint function from device tree.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/endpoint/pci-epc-core.c | 61 +++++++++++++++++++++++++++++
include/linux/pci-epc.h | 4 +-
2 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 5bc094093a47..0c2fdd39090c 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -83,6 +83,66 @@ struct pci_epc *pci_epc_get(const char *epc_name)
}
EXPORT_SYMBOL_GPL(pci_epc_get);

+/**
+ * of_pci_epc_get() - get PCI endpoint controller from device node and index
+ * @node: device node which contains the phandle to endpoint controller
+ * @index: index of the endpoint controller in "epcs" property
+ *
+ * Returns the EPC corresponding to the _index_ entry in "epcs" property
+ * present in device node, after getting a refcount to it or -ENODEV if
+ * there is no such EPC or -EPROBE_DEFER if there is a phandle to the phy,
+ * but the device is not yet loaded.
+ */
+struct pci_epc *of_pci_epc_get(struct device_node *node, int index)
+{
+ struct device_node *epc_node;
+ struct class_dev_iter iter;
+ struct pci_epc *epc;
+ struct device *dev;
+
+ epc_node = of_parse_phandle(node, "epcs", index);
+ if (!epc_node)
+ return ERR_PTR(-ENODEV);
+
+ class_dev_iter_init(&iter, pci_epc_class, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
+ epc = to_pci_epc(dev);
+ if (epc_node != epc->dev.of_node)
+ continue;
+
+ of_node_put(epc_node);
+ class_dev_iter_exit(&iter);
+ get_device(&epc->dev);
+ return epc;
+ }
+
+ of_node_put(node);
+ class_dev_iter_exit(&iter);
+ return ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL_GPL(of_pci_epc_get);
+
+/**
+ * of_pci_epc_get_by_name() - get PCI endpoint controller from device node
+ * and string
+ * @node: device node which contains the phandle to endpoint controller
+ * @epc_name: name of endpoint controller as present in "epc-names" property
+ *
+ * Returns the EPC corresponding to the epc_name in "epc-names" property
+ * present in device node.
+ */
+struct pci_epc *of_pci_epc_get_by_name(struct device_node *node,
+ const char *epc_name)
+{
+ int index = 0;
+
+ if (epc_name)
+ index = of_property_match_string(node, "epc-names", epc_name);
+
+ return of_pci_epc_get(node, index);
+}
+EXPORT_SYMBOL_GPL(of_pci_epc_get_by_name);
+
/**
* pci_epc_get_first_free_bar() - helper to get first unreserved BAR
* @epc_features: pci_epc_features structure that holds the reserved bar bitmap
@@ -661,6 +721,7 @@ __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
device_initialize(&epc->dev);
epc->dev.class = pci_epc_class;
epc->dev.parent = dev;
+ epc->dev.of_node = dev->of_node;
epc->ops = ops;

ret = dev_set_name(&epc->dev, "%s", dev_name(dev));
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 0fff52675a6b..ef6531af6ed2 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -202,7 +202,9 @@ unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
*epc_features);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);
-
+struct pci_epc *of_pci_epc_get(struct device_node *node, int index);
+struct pci_epc *of_pci_epc_get_by_name(struct device_node *node,
+ const char *epc_name);
int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size,
size_t page_size);
void pci_epc_mem_exit(struct pci_epc *epc);
--
2.17.1
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