arch/arm64/imx9: Configure ENET clock

Configure ENET clock to 125MHz in clock init

Signed-off-by: Jouni Ukkonen <jouni.ukkonen@unikie.com>

arch/arm64/src/imx9/hardware/imx93/imx93_ccm.h

@@ -730,6 +730,8 @@ static const int g_ccm_root_mux[][ROOT_MUX_MAX] =
 #define CCM_NIC_APB_CLK_ROOT         66
 #define CCM_DRAM_ALT_CLK_ROOT        76
 #define CCM_DRAM_APB_CLK_ROOT        77
+#define CCM_ENET_TIMER_CLK_ROOT      87
+#define CCM_ENET_REF_CLK_ROOT        89
 #define CCM_CLK_ROOT_NUM             95
 
 #define CCM_OSCPLL_END               19

arch/arm64/src/imx9/imx9_ccm.c

@@ -556,5 +556,25 @@ int imx9_ccm_clock_init(void)
       return ret;
     }
 
+  /* ENET to 125MHz */
+
+  imx9_ccm_gate_on(CCM_LPCG_ENET1, false);
+
+  ret = imx9_ccm_configure_root_clock(CCM_ENET_REF_CLK_ROOT,
+                                      SYS_PLL1PFD0DIV2, 2);
+  if (ret != 0)
+    {
+      return ret;
+    }
+
+  ret = imx9_ccm_configure_root_clock(CCM_ENET_TIMER_CLK_ROOT,
+                                      SYS_PLL1PFD0DIV2, 5);
+  if (ret != 0)
+    {
+      return ret;
+    }
+
+  imx9_ccm_gate_on(CCM_LPCG_ENET1, true);
+
   return OK;
 }