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([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 15 Mar 2019 09:58:18 -0700 From: Heikki Krogerus To: Hans de Goede Cc: Andy Shevchenko , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, platform-driver-x86@vger.kernel.org Subject: [PATCH 09/12] platform/x86: intel_cht_int33fe: Link with external dependencies using fwnodes Date: Fri, 15 Mar 2019 19:57:57 +0300 Message-Id: <20190315165800.5058-10-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190315165800.5058-1-heikki.krogerus@linux.intel.com> References: <20190315165800.5058-1-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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