net/wan/fsl_ucc_hdlc: hmask

Ability to set hmask in the device-tree,
which can be used to change address
filtering of packets.
Signed-off-by: David Gounaris <david.gounaris@infinera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/soc/fsl/cpm_qe/network.txt

@@ -98,6 +98,12 @@ The property below is dependent on fsl,tdm-interface:
 	usage: optional for tdm interface
 	value type: <empty>
 	Definition : Internal loopback connecting on TDM layer.
+- fsl,hmask
+	usage: optional
+	Value type: <u16>
+	Definition: HDLC address recognition. Set to zero to disable
+		    address filtering of packets:
+		    fsl,hmask = /bits/ 16 <0x0000>;
 
 Example for tdm interface:
 

drivers/net/wan/fsl_ucc_hdlc.c

@@ -265,7 +265,7 @@ static int uhdlc_init(struct ucc_hdlc_private *priv)
 	iowrite16be(MAX_FRAME_LENGTH, &priv->ucc_pram->mflr);
 	iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfthr);
 	iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfcnt);
-	iowrite16be(DEFAULT_ADDR_MASK, &priv->ucc_pram->hmask);
+	iowrite16be(priv->hmask, &priv->ucc_pram->hmask);
 	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr1);
 	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr2);
 	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr3);
@@ -1096,6 +1096,9 @@ static int ucc_hdlc_probe(struct platform_device *pdev)
 			goto free_utdm;
 	}
 
+	if (of_property_read_u16(np, "fsl,hmask", &uhdlc_priv->hmask))
+		uhdlc_priv->hmask = DEFAULT_ADDR_MASK;
+
 	ret = uhdlc_init(uhdlc_priv);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to init uhdlc\n");

drivers/net/wan/fsl_ucc_hdlc.h

@@ -106,6 +106,7 @@ struct ucc_hdlc_private {
 
 	unsigned short encoding;
 	unsigned short parity;
+	unsigned short hmask;
 	u32 clocking;
 	spinlock_t lock;	/* lock for Tx BD and Tx buffer */
 #ifdef CONFIG_PM