[PATCH v5 08/11] serial: exar: Factor out platform hooks

From: Jan Kiszka
Date: Fri Jun 02 2017 - 03:31:30 EST


This prepares the addition of IOT2040 platform support by preparing the
needed setup and rs485_config hooks.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
---
drivers/tty/serial/8250/8250_exar.c | 32 +++++++++++++++++++++++++++-----
1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index ee4b142f3ed0..1106f1f58c77 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -63,6 +63,11 @@

struct exar8250;

+struct exar8250_platform {
+ int (*rs485_config)(struct uart_port *, struct serial_rs485 *);
+ int (*register_gpio)(struct pci_dev *, struct uart_8250_port *);
+};
+
/**
* struct exar8250_board - board information
* @num_ports: number of serial ports
@@ -196,7 +201,7 @@ static void setup_gpio(struct pci_dev *pcidev, u8 __iomem *p)
}

static void *
-xr17v35x_register_gpio(struct pci_dev *pcidev)
+__xr17v35x_register_gpio(struct pci_dev *pcidev)
{
struct platform_device *pdev;

@@ -215,17 +220,36 @@ xr17v35x_register_gpio(struct pci_dev *pcidev)
return pdev;
}

+static int xr17v35x_register_gpio(struct pci_dev *pcidev,
+ struct uart_8250_port *port)
+{
+ if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
+ port->port.private_data =
+ __xr17v35x_register_gpio(pcidev);
+
+ return 0;
+}
+
+static const struct exar8250_platform exar8250_default_platform = {
+ .register_gpio = xr17v35x_register_gpio,
+};
+
static int
pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
struct uart_8250_port *port, int idx)
{
const struct exar8250_board *board = priv->board;
+ const struct exar8250_platform *platform;
unsigned int offset = idx * 0x400;
unsigned int baud = 7812500;
u8 __iomem *p;
int ret;

+ platform = &exar8250_default_platform;
+
port->port.uartclk = baud * 16;
+ port->port.rs485_config = platform->rs485_config;
+
/*
* Setup the uart clock for the devices on expansion slot to
* half the clock speed of the main chip (which is 125MHz)
@@ -248,12 +272,10 @@ pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
/* Setup Multipurpose Input/Output pins. */
setup_gpio(pcidev, p);

- if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
- port->port.private_data =
- xr17v35x_register_gpio(pcidev);
+ ret = platform->register_gpio(pcidev, port);
}

- return 0;
+ return ret;
}

static void pci_xr17v35x_exit(struct pci_dev *pcidev)
--
2.12.3