realtek: pcs: add CMU management SerDes ops

Add new SerDes ops for CMU management to be able to share common
behavior of CMU configuration for RTL930x and RTL931x while still
covering variant specifics.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: openwrt/openwrt#22198
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Author: jonasjelonek

target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c

@@ -179,6 +179,14 @@ struct rtpcs_serdes_ops {
 	int (*set_autoneg)(struct rtpcs_serdes *sds, unsigned int neg_mode,
 			   const unsigned long *advertising);
 	void (*restart_autoneg)(struct rtpcs_serdes *sds);
+
+	/* CMU management */
+	int (*get_pll_select)(struct rtpcs_serdes *sds, enum rtpcs_sds_pll_type *pll);
+	int (*set_pll_select)(struct rtpcs_serdes *sds, enum rtpcs_sds_mode hw_mode,
+			      enum rtpcs_sds_pll_type pll);
+	int (*reset_cmu)(struct rtpcs_serdes *sds, enum rtpcs_sds_pll_type pll);
+	/* online reconfiguration of a running SerDes to another PLL */
+	int (*reconfigure_to_pll)(struct rtpcs_serdes *sds, enum rtpcs_sds_pll_type pll);
 };
 
 struct rtpcs_sds_reg_field {