sh_eth: gather all TSU init code in one place

The  sh_eth_cpu_data::chip_reset() method  always resets using ARSTR and
this register is always located at the start of the  TSU register region.
Therefore, we can  only call  this method if we know TSU is there and thus
simplify  the probing code a  bit...
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/sh_eth.c

@@ -3222,7 +3222,6 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
 		eth_hw_addr_random(ndev);
 	}
 
-	/* ioremap the TSU registers */
 	if (mdp->cd->tsu) {
 		struct resource *rtsu;
 
@@ -3243,6 +3242,7 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
 			ret = -EBUSY;
 			goto out_release;
 		}
+		/* ioremap the TSU registers */
 		mdp->tsu_addr = devm_ioremap(&pdev->dev, rtsu->start,
 					     resource_size(rtsu));
 		if (!mdp->tsu_addr) {
@@ -3252,14 +3252,12 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
 		}
 		mdp->port = devno % 2;
 		ndev->features = NETIF_F_HW_VLAN_CTAG_FILTER;
-	}
 
-	/* Need to init only the first port of the two sharing a TSU */
-	if (devno % 2 == 0) {
-		if (mdp->cd->chip_reset)
-			mdp->cd->chip_reset(ndev);
+		/* Need to init only the first port of the two sharing a TSU */
+		if (devno % 2 == 0) {
+			if (mdp->cd->chip_reset)
+				mdp->cd->chip_reset(ndev);
 
-		if (mdp->cd->tsu) {
 			/* TSU init (Init only)*/
 			sh_eth_tsu_init(mdp);
 		}