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Subject[PATCH 09/12] platform/x86: intel_cht_int33fe: Link with external dependencies using fwnodes
Date
Supplying also external devices - the DisplayPort connector
and the USB role switch - software fwnodes. After this the
driver has access to all the components tied to the USB
Type-C connector and can start creating software node
references to actually associate them with the USB Type-C
connector device.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/platform/x86/intel_cht_int33fe.c | 102 +++++++++++++++++++++++
1 file changed, 102 insertions(+)

diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
index 44860c748bf5..aa71b97a22e9 100644
--- a/drivers/platform/x86/intel_cht_int33fe.c
+++ b/drivers/platform/x86/intel_cht_int33fe.c
@@ -33,6 +33,8 @@ enum {
INT33FE_NODE_FUSB302,
INT33FE_NODE_MAX17047,
INT33FE_NODE_PI3USB30532,
+ INT33FE_NODE_DISPLAYPORT,
+ INT33FE_NODE_ROLE_SWITCH,
INT33FE_NODE_USB_CONNECTOR,
INT33FE_NODE_MAX,
};
@@ -44,6 +46,7 @@ struct cht_int33fe_data {
/* Contain a list-head must be per device */
struct device_connection connections[4];

+ struct fwnode_handle *dp;
struct fwnode_handle *node[INT33FE_NODE_MAX];
};

@@ -144,8 +147,81 @@ static const struct property_entry *props[] = {
[INT33FE_NODE_FUSB302] = fusb302_props,
[INT33FE_NODE_MAX17047] = NULL,
[INT33FE_NODE_PI3USB30532] = NULL,
+ [INT33FE_NODE_DISPLAYPORT] = NULL,
+ [INT33FE_NODE_ROLE_SWITCH] = NULL,
};

+static const char *dp_acpi_node_name = "DD02";
+static const char *mux_platfrom_dev_name = "intel_xhci_usb_sw";
+static const char *mux_name = "intel_xhci_usb_sw-role-switch";
+
+static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
+{
+ struct fwnode_handle *fwnode = data->node[INT33FE_NODE_DISPLAYPORT];
+ struct pci_dev *pdev;
+
+ /* First let's find the GPU PCI device */
+ pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
+ if (!pdev || (pdev->vendor != PCI_VENDOR_ID_INTEL))
+ return -ENODEV;
+
+ /* Then the DP child device node */
+ data->dp = device_get_named_child_node(&pdev->dev, dp_acpi_node_name);
+ pci_dev_put(pdev);
+ if (!data->dp)
+ return -ENODEV;
+
+ fwnode->secondary = ERR_PTR(-ENODEV);
+ data->dp->secondary = fwnode;
+
+ return 0;
+}
+
+static int role_switch_match(struct device *dev, void *name)
+{
+ return !strcmp(dev_name(dev), name);
+}
+
+static int cht_int33fe_setup_mux(struct cht_int33fe_data *data)
+{
+ struct fwnode_handle *fwnode = data->node[INT33FE_NODE_ROLE_SWITCH];
+ struct pci_dev *pdev;
+ struct device *dev;
+ struct device *p;
+
+ /* First let's find xHCI PCI device */
+ pdev = pci_get_class(PCI_CLASS_SERIAL_USB_XHCI, NULL);
+ if (!pdev || (pdev->vendor != PCI_VENDOR_ID_INTEL))
+ return -ENODEV;
+
+ /* Then the child platform device */
+ p = device_find_child(&pdev->dev, (void *)mux_platfrom_dev_name,
+ role_switch_match);
+ pci_dev_put(pdev);
+ if (!p)
+ return -EPROBE_DEFER;
+
+ /* Finally the mux device */
+ dev = device_find_child(p, (void *)mux_name, role_switch_match);
+ put_device(p);
+ if (!dev)
+ return -EPROBE_DEFER;
+
+ /* If there already is a node for the mux, using that one. */
+ if (dev->fwnode) {
+ fwnode_handle_get(dev->fwnode);
+ fwnode_remove_software_node(fwnode);
+ data->node[INT33FE_NODE_ROLE_SWITCH] = dev->fwnode;
+ } else {
+ /* The node can be tied to the lifetime of the device. */
+ dev->fwnode = fwnode_handle_get(dev->fwnode);
+ }
+
+ put_device(dev);
+
+ return 0;
+}
+
static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
{
int i;
@@ -154,6 +230,12 @@ static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
fwnode_remove_software_node(data->node[i]);
data->node[i] = NULL;
}
+
+ if (data->dp) {
+ data->dp->secondary = NULL;
+ fwnode_handle_put(data->dp);
+ data->dp = NULL;
+ }
}

static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
@@ -180,6 +262,26 @@ static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
}
data->node[INT33FE_NODE_USB_CONNECTOR] = fwnode;

+ /* 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.
+ */
+ ret = cht_int33fe_setup_mux(data);
+ if (ret)
+ goto err_remove_nodes;
+
+ /*
+ * The DP connector does have ACPI device node. In this case we can just
+ * find that ACPI node and assing our node as the secondary node to it.
+ */
+ ret = cht_int33fe_setup_dp(data);
+ if (ret)
+ goto err_remove_nodes;
+
return 0;

err_remove_nodes:
--
2.20.1
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