phy: ti: phy-j721e-wiz: set PMA_CMN_REFCLK_DIG_DIV based on reflk rate

For J7200-SR2.0 and AM64 we don't model Common refclock divider as
a clock divider as the divisor rate is fixed based on operating
reference clock frequency. We just program the recommended value
into the register. This simplifies the device tree and implementation
a lot.
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20220628122255.24265-8-rogerq@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/ti/phy-j721e-wiz.c

@@ -24,6 +24,11 @@
 #include <linux/regmap.h>
 #include <linux/reset-controller.h>
 
+#define REF_CLK_19_2MHZ         19200000
+#define REF_CLK_25MHZ           25000000
+#define REF_CLK_100MHZ          100000000
+#define REF_CLK_156_25MHZ       156250000
+
 /* SCM offsets */
 #define SERDES_SUP_CTRL		0x4400
 
@@ -1053,6 +1058,25 @@ static int wiz_clock_init(struct wiz *wiz, struct device_node *node)
 	else
 		regmap_field_write(wiz->pma_cmn_refclk_int_mode, 0x3);
 
+	switch (wiz->type) {
+	case AM64_WIZ_10G:
+	case J7200_WIZ_10G:
+		switch (rate) {
+		case REF_CLK_100MHZ:
+			regmap_field_write(wiz->div_sel_field[CMN_REFCLK_DIG_DIV], 0x2);
+			break;
+		case REF_CLK_156_25MHZ:
+			regmap_field_write(wiz->div_sel_field[CMN_REFCLK_DIG_DIV], 0x3);
+			break;
+		default:
+			regmap_field_write(wiz->div_sel_field[CMN_REFCLK_DIG_DIV], 0);
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
 	if (wiz->data->pma_cmn_refclk1_int_mode) {
 		clk = devm_clk_get(dev, "core_ref1_clk");
 		if (IS_ERR(clk)) {