text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Copyright 2011-2015 Freescale Semiconductor, Inc.
   */
  
  #include <common.h>
  #include <linux/libfdt.h>
  #include <linux/libfdt_env.h>
  #include <fdt_support.h>
  
  #include <fm_eth.h>
  #ifdef CONFIG_FSL_LAYERSCAPE
  #include <asm/arch/fsl_serdes.h>
  #else
  #include <asm/fsl_serdes.h>
  #endif
  
  /*
   * Given the following ...
   *
   * 1) A pointer to an Fman Ethernet node (as identified by the 'compat'
   * compatible string and 'addr' physical address)
   *
   * 2) The name of an alias that points to the ethernet-phy node (usually inside
   * a virtual MDIO node)
   *
   * ... update that Ethernet node's phy-handle property to point to the
   * ethernet-phy node.  This is how we link an Ethernet node to its PHY, so each
   * PHY in a virtual MDIO node must have an alias.
   *
   * Returns 0 on success, or a negative FDT error code on error.
   */
  int fdt_set_phy_handle(void *fdt, char *compat, phys_addr_t addr,
  			const char *alias)
  {
  	int offset;
  	unsigned int ph;
  	const char *path;
  
  	/* Get a path to the node that 'alias' points to */
  	path = fdt_get_alias(fdt, alias);
  	if (!path)
  		return -FDT_ERR_BADPATH;
  
  	/* Get the offset of that node */
  	offset = fdt_path_offset(fdt, path);
  	if (offset < 0)
  		return offset;
  
  	ph = fdt_create_phandle(fdt, offset);
  	if (!ph)
  		return -FDT_ERR_BADPHANDLE;
  
  	ph = cpu_to_fdt32(ph);
  
  	offset = fdt_node_offset_by_compat_reg(fdt, compat, addr);
  	if (offset < 0)
  		return offset;
  
  	return fdt_setprop(fdt, offset, "phy-handle", &ph, sizeof(ph));
  }
  
  /*
   * Return the SerDes device enum for a given Fman port
   *
   * This function just maps the fm_port namespace to the srds_prtcl namespace.
   */
  enum srds_prtcl serdes_device_from_fm_port(enum fm_port port)
  {
  	static const enum srds_prtcl srds_table[] = {
  		[FM1_DTSEC1] = SGMII_FM1_DTSEC1,
  		[FM1_DTSEC2] = SGMII_FM1_DTSEC2,
  		[FM1_DTSEC3] = SGMII_FM1_DTSEC3,
  		[FM1_DTSEC4] = SGMII_FM1_DTSEC4,
  		[FM1_DTSEC5] = SGMII_FM1_DTSEC5,
  		[FM1_10GEC1] = XAUI_FM1,
  		[FM2_DTSEC1] = SGMII_FM2_DTSEC1,
  		[FM2_DTSEC2] = SGMII_FM2_DTSEC2,
  		[FM2_DTSEC3] = SGMII_FM2_DTSEC3,
  		[FM2_DTSEC4] = SGMII_FM2_DTSEC4,
  		[FM2_DTSEC5] = SGMII_FM2_DTSEC5,
  		[FM2_10GEC1] = XAUI_FM2,
  	};
  
  	if ((port < FM1_DTSEC1) || (port > FM2_10GEC1))
  		return NONE;
  	else
  		return srds_table[port];
  }
  