linux-kernel - [PATCH net-next v3 3/3] net: fec: make PPS channel configurable

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Message-Id: <20240809094804.391441-4-francesco@dolcini.it>
Date: Fri,  9 Aug 2024 11:48:04 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Wei Fang <wei.fang@....com>,
	Shenwei Wang <shenwei.wang@....com>,
	Clark Wang <xiaoning.wang@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>
Cc: Francesco Dolcini <francesco.dolcini@...adex.com>,
	imx@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Frank Li <Frank.Li@....com>,
	Rafael Beims <rafael.beims@...adex.com>
Subject: [PATCH net-next v3 3/3] net: fec: make PPS channel configurable

From: Francesco Dolcini <francesco.dolcini@...adex.com>

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 <Frank.Li@....com>
Tested-by: Rafael Beims <rafael.beims@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
v3: added net-next subject prefix
v2: add Reviewed|Tested-by
---
 drivers/net/ethernet/freescale/fec_ptp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index 25f988b9c7cf..2e05083cbf29 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -529,8 +529,6 @@ 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;
 
@@ -712,12 +710,16 @@ 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;
-- 
2.39.2