DP83TC812R-Q1: What's return ID (DP83TC812_CS2_x_PHY_ID) for device DP83TC812RRHARQ1

Hi, expert

As title description, we study DP83TC812R driver, and found it includes two PHY_ID code.

https://git.ti.com/gitweb?p=ti-analog-linux-kernel/analog-linux.git;a=blob;f=drivers/net/phy/dp83tc812.c;h=0c594375f188d40299603628a0636947cfea35bf;hb=f973f3deb81b1f44aa4c33b275a342e28fc982fd

#define DP83TC812_CS1_0_PHY_ID	0x2000a270
#define DP83TC812_CS2_0_PHY_ID	0x2000a271

static const struct dp83812_init_reg dp83812_master_cs1_0_init[] = {
	{0x523, 0x0001},
	{0x800, 0xf864},
	{0x803, 0x1552},
	{0x804, 0x1a66},
	{0x805, 0x1f7b},
	{0x81f, 0x2a88},
	{0x825, 0x40e5},
	{0x82b, 0x7f3f},
	{0x830, 0x0543},
	{0x836, 0x5008},
	{0x83a, 0x08e0},
	{0x83b, 0x0845},
	{0x83e, 0x0445},
	{0x855, 0x9b9a},
	{0x85f, 0x2010},
	{0x860, 0x6040},
	{0x86c, 0x1333},
	{0x86b, 0x3e10},
	{0x872, 0x88c0},
	{0x873, 0x0003},
	{0x879, 0x000f},
	{0x87b, 0x0070},
	{0x87c, 0x003f},
	{0x89e, 0x00aa},
	{0x523, 0x0000},
};

static const struct dp83812_init_reg dp83812_master_cs2_0_init[] = {
	{0x523, 0x0001},
	{0x81C, 0x0fe2},
	{0x872, 0x0300},
	{0x879, 0x0f00},
	{0x806, 0x2952},
	{0x807, 0x3361},
	{0x808, 0x3D7B},
	{0x83E, 0x045F},
	{0x834, 0x8000},
	{0x862, 0x00E8},
	{0x896, 0x32CB},
	{0x03E, 0x0009},
	{0x01f, 0x4000},
	{0x523, 0x0000},
};

Each ID has its own init sequence, so what's the difference?

Does DP83TC812RRHARQ1 return "DP83TC812_CS1_0_PHY_ID" or "DP83TC812_CS2_0_PHY_ID"?

Many Thanks

Gibbs