[openwrt/openwrt] realtek: pcs: add dedicated enum for SerDes modes

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch openwrt-25.12:
https://git.openwrt.org/d8b1a54c78f39ff7314d0237e2a463b3cf2b4b8c

commit d8b1a54c78f39ff7314d0237e2a463b3cf2b4b8c
Author: Jonas Jelonek <jelonek.jonas at gmail.com>
AuthorDate: Thu Dec 11 19:17:26 2025 +0000

    realtek: pcs: add dedicated enum for SerDes modes
    
    The Realtek SerDes mode capabilities do not map 1:1 to the
    PHY_INTERFACE_MODE_* modes used in the kernel and passed to the PCS.
    For example, some PHY chips use the proprietary XSGMII mode for which
    there isn't an equivalent in the kernel, or HSGMII.
    
    In the past, this led to problems and confusion using kernel's XGMII to
    handle the XSGMII mode, and needed a downstream patch for HSGMII. They
    have been solved/worked around for now, but XSGMII is currently not
    implemented at all. And who knows what might come in the future.
    
    To make our life easier, introduce a dedicated internal representation
    of SerDes modes which differs from kernel's PHY_INTERFACE_MODE_*. This
    allows us to map "external" modes to different internal modes as needed
    instead of carrying the PHY_INTERFACE_MODE_* through the whole SerDes
    configuration code. The PCS driver needs to map PHY_INTERFACE_MODE_* to
    RTPCS_SDS_MODE_* in pcs_config, and the latter should be used as the
    only one.
    
    Signed-off-by: Jonas Jelonek <jelonek.jonas at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/21146
    Signed-off-by: Robert Marko <robimarko at gmail.com>
    (cherry picked from commit a4d6e10bf2561a39d9bb3c9e622531e8d5c9caf3)
---
 .../files-6.12/drivers/net/pcs/pcs-rtl-otto.c      | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)

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 def6b445d4..1a87d0d112 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
@@ -102,6 +102,29 @@
 #define RTL931X_PS_SERDES_OFF_MODE_CTRL_ADDR	(0x13F4)
 #define RTL931X_MAC_SERDES_MODE_CTRL(sds)	(0x136C + (((sds) << 2)))
 
+enum rtpcs_sds_mode {
+	RTPCS_SDS_MODE_OFF = 0,
+
+	/* fiber modes */
+	RTPCS_SDS_MODE_1000BASEX,
+	RTPCS_SDS_MODE_2500BASEX,
+	RTPCS_SDS_MODE_10GBASER,
+
+	/* mii modes */
+	RTPCS_SDS_MODE_SGMII,
+	RTPCS_SDS_MODE_HISGMII,
+	RTPCS_SDS_MODE_QSGMII,
+	RTPCS_SDS_MODE_QHSGMII,
+	RTPCS_SDS_MODE_XSGMII,
+
+	RTPCS_SDS_MODE_USXGMII_10GSXGMII,
+	RTPCS_SDS_MODE_USXGMII_10GDXGMII,
+	RTPCS_SDS_MODE_USXGMII_10GQXGMII,
+	RTPCS_SDS_MODE_USXGMII_5GSXGMII,
+	RTPCS_SDS_MODE_USXGMII_5GDXGMII,
+	RTPCS_SDS_MODE_USXGMII_2_5GSXGMII,
+};
+
 struct rtpcs_ctrl {
 	struct device *dev;
 	struct regmap *map;