Re: [PATCH v4 15/16] platform/x86: intel_cht_int33fe: Supply fwnodes for the external dependencies

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 5/22/19 12:51 PM, Heikki Krogerus wrote:
> 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>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> ---
>   drivers/platform/x86/intel_cht_int33fe.c | 128 ++++++++++++++++++++++-
>   1 file changed, 125 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
> index 34bc2d178760..e5c0b6573618 100644
> --- a/drivers/platform/x86/intel_cht_int33fe.c
> +++ b/drivers/platform/x86/intel_cht_int33fe.c
> @@ -21,6 +21,7 @@
>   #include <linux/i2c.h>
>   #include <linux/interrupt.h>
>   #include <linux/module.h>
> +#include <linux/pci.h>
>   #include <linux/platform_device.h>
>   #include <linux/regulator/consumer.h>
>   #include <linux/slab.h>
> @@ -32,6 +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,
>   };
> @@ -42,6 +45,9 @@ struct cht_int33fe_data {
>   	struct i2c_client *pi3usb30532;
>   	/* Contain a list-head must be per device */
>   	struct device_connection connections[4];
> +
> +	struct fwnode_handle *dp;
> +	struct fwnode_handle *mux;
>   };
>   
>   /*
> @@ -110,10 +116,126 @@ static const struct software_node nodes[] = {
>   	{ "fusb302", NULL, fusb302_props },
>   	{ "max17047", NULL, max17047_props },
>   	{ "pi3usb30532" },
> +	{ "displayport" },
> +	{ "usb-role-switch" },
>   	{ "connector", &nodes[0], usb_connector_props },
>   	{ }
>   };
>   
> +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);
> +
> +	return 0;
> +}
> +
> +static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
> +{
> +	struct fwnode_handle *fwnode;
> +	struct pci_dev *pdev;
> +
> +	fwnode = software_node_fwnode(&nodes[INT33FE_NODE_DISPLAYPORT]);
> +	if (!fwnode)
> +		return -ENODEV;
> +
> +	/* 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) {
> +		pci_dev_put(pdev);
> +		return -ENODEV;
> +	}
> +
> +	/* Then the DP child device node */
> +	data->dp = device_get_named_child_node(&pdev->dev, "DD02");
> +	pci_dev_put(pdev);
> +	if (!data->dp)
> +		return -ENODEV;
> +
> +	fwnode->secondary = ERR_PTR(-ENODEV);
> +	data->dp->secondary = fwnode;
> +
> +	return 0;
> +}
> +
> +static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
> +{
> +	software_node_unregister_nodes(nodes);
> +
> +	if (data->mux) {
> +		fwnode_handle_put(data->mux);
> +		data->mux = 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)
> +{
> +	int ret;
> +
> +	ret = software_node_register_nodes(nodes);
> +	if (ret)
> +		return ret;
> +
> +	/* 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.
> +	 */


s/assing/adding/  I presume ?

Regards,

Hans



> +	ret = cht_int33fe_setup_dp(data);
> +	if (ret)
> +		goto err_remove_nodes;
> +
> +	return 0;
> +
> +err_remove_nodes:
> +	cht_int33fe_remove_nodes(data);
> +
> +	return ret;
> +}
> +
>   static int
>   cht_int33fe_register_max17047(struct device *dev, struct cht_int33fe_data *data)
>   {
> @@ -211,7 +333,7 @@ static int cht_int33fe_probe(struct platform_device *pdev)
>   	if (!data)
>   		return -ENOMEM;
>   
> -	ret = software_node_register_nodes(nodes);
> +	ret = cht_int33fe_add_nodes(data);
>   	if (ret)
>   		return ret;
>   
> @@ -280,7 +402,7 @@ static int cht_int33fe_probe(struct platform_device *pdev)
>   	device_connections_remove(data->connections);
>   
>   out_remove_nodes:
> -	software_node_unregister_nodes(nodes);
> +	cht_int33fe_remove_nodes(data);
>   
>   	return ret;
>   }
> @@ -294,7 +416,7 @@ static int cht_int33fe_remove(struct platform_device *pdev)
>   	i2c_unregister_device(data->max17047);
>   
>   	device_connections_remove(data->connections);
> -	software_node_unregister_nodes(nodes);
> +	cht_int33fe_remove_nodes(data);
>   
>   	return 0;
>   }
>