Bluetooth: hci_bcm: Retrieve UART speed from ACPI

Parse platform_device's ACPI to retrieve UART init speed.
When BCM device is open, check if its TTY has same parent as one of the
platform devices saved. If yes, use platform_device's init speed.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 6ac6636..12490eb 100644 (file)
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -49,6 +49,8 @@ struct bcm_device {
 
        struct clk              *clk;
        bool                    clk_enabled;
+
+       u32                     init_speed;
 };
 
 struct bcm_data {
@@ -167,6 +169,7 @@ static int bcm_open(struct hci_uart *hu)
                 */
                if (hu->tty->dev->parent == dev->pdev->dev.parent) {
                        bcm->dev = dev;
+                       hu->init_speed = dev->init_speed;
                        break;
                }
        }
@@ -324,11 +327,29 @@ static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
        { },
 };
 
+static int bcm_resource(struct acpi_resource *ares, void *data)
+{
+       struct bcm_device *dev = data;
+
+       if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
+               struct acpi_resource_uart_serialbus *sb;
+
+               sb = &ares->data.uart_serial_bus;
+               if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
+                       dev->init_speed = sb->default_baud_rate;
+       }
+
+       /* Always tell the ACPI core to skip this resource */
+       return 1;
+}
+
 static int bcm_acpi_probe(struct bcm_device *dev)
 {
        struct platform_device *pdev = dev->pdev;
        const struct acpi_device_id *id;
        struct gpio_desc *gpio;
+       struct acpi_device *adev;
+       LIST_HEAD(resources);
        int ret;
 
        id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
@@ -368,6 +389,13 @@ static int bcm_acpi_probe(struct bcm_device *dev)
                return -EINVAL;
        }
 
+       /* Retrieve UART ACPI info */
+       adev = ACPI_COMPANION(&dev->pdev->dev);
+       if (!adev)
+               return 0;
+
+       acpi_dev_get_resources(adev, &resources, bcm_resource, dev);
+
        return 0;
 }