can: ti hecc module : add platform specific initialization callback.

CAN module on AM3517 requires programming of IO expander as part
of init sequence - to enable CAN PHY. Added platform specific
callback to handle phy control(switch on /off).

Signed-off-by: Sriramakrishnan <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/can/ti_hecc.c

···
  *         .mbx_offset             = 0x2000,
  *         .int_line               = 0,
  *         .revision               = 1,
+ *         .transceiver_switch     = hecc_phy_control,
  * };
  *
- * Please see include/can/platform/ti_hecc.h for description of above fields
+ * Please see include/linux/can/platform/ti_hecc.h for description of
+ * above fields.
  *
  */
 
···
 	u32 tx_head;
 	u32 tx_tail;
 	u32 rx_next;
+	void (*transceiver_switch)(int);
 };
 
 static inline int get_tx_head_mb(struct ti_hecc_priv *priv)
···
 	dev_info(priv->ndev->dev.parent, "setting CANBTC=%#x\n", can_btc);
 
 	return 0;
+}
+
+static void ti_hecc_transceiver_switch(const struct ti_hecc_priv *priv,
+					int on)
+{
+	if (priv->transceiver_switch)
+		priv->transceiver_switch(on);
 }
 
 static void ti_hecc_reset(struct net_device *ndev)
···
 		return err;
 	}
 
+	ti_hecc_transceiver_switch(priv, 1);
+
 	/* Open common can device */
 	err = open_candev(ndev);
 	if (err) {
 		dev_err(ndev->dev.parent, "open_candev() failed %d\n", err);
+		ti_hecc_transceiver_switch(priv, 0);
 		free_irq(ndev->irq, ndev);
 		return err;
 	}
···
 	ti_hecc_stop(ndev);
 	free_irq(ndev->irq, ndev);
 	close_candev(ndev);
+	ti_hecc_transceiver_switch(priv, 0);
 
 	return 0;
 }
···
 	priv->hecc_ram_offset = pdata->hecc_ram_offset;
 	priv->mbx_offset = pdata->mbx_offset;
 	priv->int_line = pdata->int_line;
+	priv->transceiver_switch = pdata->transceiver_switch;
 
 	priv->can.bittiming_const = &ti_hecc_bittiming_const;
 	priv->can.do_set_mode = ti_hecc_do_set_mode;

include/linux/can/platform/ti_hecc.h

···
+#ifndef __CAN_PLATFORM_TI_HECC_H__
+#define __CAN_PLATFORM_TI_HECC_H__
+
 /*
  * TI HECC (High End CAN Controller) driver platform header
  *
···
  * @mbx_offset:		Mailbox RAM offset
  * @int_line:		Interrupt line to use - 0 or 1
  * @version:		version for future use
+ * @transceiver_switch:	platform specific callback fn for transceiver control
  *
  * Platform data structure to get all platform specific settings.
  * this structure also accounts the fact that the IP may have different
···
 	u32 mbx_offset;
 	u32 int_line;
 	u32 version;
+	void (*transceiver_switch) (int);
 };
-
-
+#endif