net: fec: make PPS channel configurable

commit 566c2d8 upstream.

Depending on the SoC where the FEC is integrated into the PPS channel
might be routed to different timer instances. Make this configurable
from the devicetree.

When the related DT property is not present fallback to the previous
default and use channel 0.

Reviewed-by: Frank Li <[email protected]>
Tested-by: Rafael Beims <[email protected]>
Signed-off-by: Francesco Dolcini <[email protected]>
Reviewed-by: Csókás, Bence <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>
Signed-off-by: Csókás, Bence <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: dolcini

drivers/net/ethernet/freescale/fec_ptp.c

@@ -523,8 +523,6 @@ static int fec_ptp_enable(struct ptp_clock_info *ptp,
 	unsigned long flags;
 	int ret = 0;
 
-	fep->pps_channel = DEFAULT_PPS_CHANNEL;
-
 	if (rq->type == PTP_CLK_REQ_PPS) {
 		fep->reload_period = PPS_OUPUT_RELOAD_PERIOD;
 
@@ -706,12 +704,16 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct fec_enet_private *fep = netdev_priv(ndev);
+	struct device_node *np = fep->pdev->dev.of_node;
 	int irq;
 	int ret;
 
 	fep->ptp_caps.owner = THIS_MODULE;
 	strscpy(fep->ptp_caps.name, "fec ptp", sizeof(fep->ptp_caps.name));
 
+	fep->pps_channel = DEFAULT_PPS_CHANNEL;
+	of_property_read_u32(np, "fsl,pps-channel", &fep->pps_channel);
+
 	fep->ptp_caps.max_adj = 250000000;
 	fep->ptp_caps.n_alarm = 0;
 	fep->ptp_caps.n_ext_ts = 0;