[openwrt/openwrt] realtek: pcs: allow to configure SerDes polarity

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/b10663c42899a3b7015ad4a0f863767960d7123d

commit b10663c42899a3b7015ad4a0f863767960d7123d
Author: Jonas Jelonek <jelonek.jonas at gmail.com>
AuthorDate: Tue Oct 28 22:18:34 2025 +0000

    realtek: pcs: allow to configure SerDes polarity
    
    Allow to configure SerDes polarity in device tree. To achieve this, add
    new device tree properties that can be set in the device tree definition
    of the SerDes, are read by the PCS driver during probe and are applied
    upon SerDes setup.
    
    This may be required for supporting new devices as the SerDes polarity
    is usually subject to the vendors board design and defined in the
    hardware profile (HWP) in the SDK. Most importantly, it is quite an
    important step towards being able to setup everything on our own instead
    of relying on the bootloader.
    
    Signed-off-by: Jonas Jelonek <jelonek.jonas at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/20648
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 .../files-6.12/drivers/net/pcs/pcs-rtl-otto.c      | 24 ++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
index bad34c046b..50addac503 100644
--- a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
+++ b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
@@ -10,6 +10,7 @@
 #include <linux/phylink.h>
 #include <linux/regmap.h>
 
+#define RTPCS_SDS_CNT				14
 #define RTPCS_PORT_CNT				57
 
 #define RTPCS_SPEED_10				0
@@ -100,6 +101,8 @@ struct rtpcs_ctrl {
 	struct mii_bus *bus;
 	const struct rtpcs_config *cfg;
 	struct rtpcs_link *link[RTPCS_PORT_CNT];
+	bool rx_pol_inv[RTPCS_SDS_CNT];
+	bool tx_pol_inv[RTPCS_SDS_CNT];
 	struct mutex lock;
 };
 
@@ -1914,7 +1917,8 @@ static int rtpcs_930x_setup_serdes(struct rtpcs_ctrl *ctrl, int sds,
 	pr_info("%s: Configuring RTL9300 SERDES %d\n", __func__, sds);
 
 	/* Set SDS polarity */
-	rtpcs_93xx_sds_set_polarity(ctrl, sds, false, false);
+	rtpcs_93xx_sds_set_polarity(ctrl, sds, ctrl->tx_pol_inv[sds],
+				    ctrl->rx_pol_inv[sds]);
 
 	/* Enable SDS in desired mode */
 	rtpcs_930x_sds_mode_set(ctrl, sds, phy_mode);
@@ -2493,7 +2497,8 @@ static int rtpcs_931x_setup_serdes(struct rtpcs_ctrl *ctrl, int sds,
 		}
 	}
 
-	rtpcs_93xx_sds_set_polarity(ctrl, sds, false, false);
+	rtpcs_93xx_sds_set_polarity(ctrl, sds, ctrl->tx_pol_inv[sds],
+				    ctrl->rx_pol_inv[sds]);
 
 	val = ori & ~BIT(sds);
 	regmap_write(ctrl->map, RTL931X_PS_SERDES_OFF_MODE_CTRL_ADDR, val);
@@ -2729,7 +2734,10 @@ static int rtpcs_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
+	struct device_node *child;
 	struct rtpcs_ctrl *ctrl;
+	u32 sds;
+	int ret;
 
 	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl)
@@ -2746,6 +2754,18 @@ static int rtpcs_probe(struct platform_device *pdev)
 	ctrl->bus = rtpcs_probe_serdes_bus(ctrl);
 	if (IS_ERR(ctrl->bus))
 		return PTR_ERR(ctrl->bus);
+
+	for_each_child_of_node(dev->of_node, child) {
+		ret = of_property_read_u32(child, "reg", &sds);
+		if (ret)
+			return ret;
+		if (sds >= RTPCS_SDS_CNT)
+			return -EINVAL;
+
+		ctrl->rx_pol_inv[sds] = of_property_read_bool(child, "realtek,pnswap-rx");
+		ctrl->tx_pol_inv[sds] = of_property_read_bool(child, "realtek,pnswap-tx");
+	}
+
 	/*
 	 * rtpcs_create() relies on that fact that data is attached to the platform device to
 	 * determine if the driver is ready. Do this after everything is initialized properly.