serial: exar: add optional board_init function

Add an optional "board_init()" function pointer to struct exar8250_board
which is called once during probe prior to setting up the ports. It will
be used in subsequent patches of this series.

Signed-off-by: Parker Newman <pnewman@connecttech.com>
Link: https://lore.kernel.org/r/0e72a3154114c733283ff273bc1e31456ee101f4.1713382717.git.pnewman@connecttech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 72385c7d2eda88ca8d61d4c4446818d820485bcf..f14f73d250bbba7047c39e6eacf76941769fba10 100644 (file)
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -177,12 +177,14 @@ struct exar8250_platform {
  * struct exar8250_board - board information
  * @num_ports: number of serial ports
  * @reg_shift: describes UART register mapping in PCI memory
- * @setup: quirk run at ->probe() stage
+ * @board_init: quirk run once at ->probe() stage before setting up ports
+ * @setup: quirk run at ->probe() stage for each port
  * @exit: quirk run at ->remove() stage
  */
 struct exar8250_board {
        unsigned int num_ports;
        unsigned int reg_shift;
+       int     (*board_init)(struct exar8250 *priv, struct pci_dev *pcidev);
        int     (*setup)(struct exar8250 *, struct pci_dev *,
                         struct uart_8250_port *, int);
        void    (*exit)(struct pci_dev *pcidev);
@@ -773,6 +775,15 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
        if (rc)
                return rc;
 
+       if (board->board_init) {
+               rc = board->board_init(priv, pcidev);
+               if (rc) {
+                       dev_err_probe(&pcidev->dev, rc,
+                                       "failed to init serial board\n");
+                       return rc;
+               }
+       }
+
        for (i = 0; i < nr_ports && i < maxnr; i++) {
                rc = board->setup(priv, pcidev, &uart, i);
                if (rc) {