mpc5121: squash some fdt fixup errors

On ADS5121 when booting linux the following errors are seen:
    Unable to update property /soc5121@80000000:bus-frequency, err=FDT_ERR_NOTFOUND
    Unable to update property /soc5121@80000000/ethernet@2800:local-mac-address, err=FDT_ERR_NOTFOUND
    Unable to update property /soc5121@80000000/ethernet@2800:address, err=FDT_ERR_NOTFOUND

This is caused by ft_cpu_setup trying to deal with
both old and new soc node naming.  This patch
fixes this by being smarter about what to
fixup.

Also do soc node fixups by compatible instead of by path.
A new board config called OF_SOC_COMPAT defined
to be "fsl,mpc5121-immr" replaces the old
OF_SOC node path that was defined to be "soc@80000000".

Old device trees still work, but the compatiblity
is conditional on CONFIG_OF_SUPPORT_OLD_DEVICE_TREES
which is on by default in include/configs/ads5121.h.

Signed-off-by: John Rigby <jrigby@freescale.com>

cpu/mpc512x/cpu.c

@@ -131,22 +131,69 @@ void watchdog_reset (void)
 #endif
 
 #ifdef CONFIG_OF_LIBFDT
-void ft_cpu_setup(void *blob, bd_t *bd)
+
+#ifdef CONFIG_OF_SUPPORT_OLD_DEVICE_TREES
+/*
+ * fdt setup for old device trees
+ * fix up
+ * 	cpu clocks
+ * 	soc clocks
+ * 	ethernet addresses
+ */
+static void old_ft_cpu_setup(void *blob, bd_t *bd)
+{
+	/*
+	 * avoid fixing up by path because that
+	 * produces scary error messages
+	 */
+
+	/*
+	 * old device trees have ethernet nodes with
+	 * device_type = "network"
+	 */
+	do_fixup_by_prop(blob, "device_type", "network", 8,
+		"local-mac-address", bd->bi_enetaddr, 6, 0);
+	do_fixup_by_prop(blob, "device_type", "network", 8,
+		"address", bd->bi_enetaddr, 6, 0);
+	/*
+	 * old device trees have soc nodes with
+	 * device_type = "soc"
+	 */
+	do_fixup_by_prop_u32(blob, "device_type", "soc", 4,
+		"bus-frequency", bd->bi_ipsfreq, 0);
+}
+#endif
+
+static void ft_clock_setup(void *blob, bd_t *bd)
 {
+	int node;
 	char *cpu_path = "/cpus/" OF_CPU;
-	char *eth_path = "/" OF_SOC "/ethernet@2800";
-	char *eth_path_old = "/" OF_SOC_OLD "/ethernet@2800";
-
-	do_fixup_by_path_u32(blob, cpu_path, "timebase-frequency", OF_TBCLK, 1);
-	do_fixup_by_path_u32(blob, cpu_path, "bus-frequency", bd->bi_busfreq, 1);
-	do_fixup_by_path_u32(blob, cpu_path, "clock-frequency", bd->bi_intfreq, 1);
-	do_fixup_by_path_u32(blob, "/" OF_SOC, "bus-frequency", bd->bi_ipsfreq, 1);
-	do_fixup_by_path(blob, eth_path, "local-mac-address", bd->bi_enetaddr, 6, 0);
-
-	/* this is so old kernels with old device trees will boot */
-	do_fixup_by_path_u32(blob, "/" OF_SOC_OLD, "bus-frequency", bd->bi_ipsfreq, 0);
-	do_fixup_by_path(blob, eth_path_old, "local-mac-address",
-			bd->bi_enetaddr, 6, 0);
-	do_fixup_by_path(blob, eth_path_old, "address", bd->bi_enetaddr, 6, 0);
+	const char *path = NULL;
+
+	/*
+	 * fixup cpu clocks using path
+	 */
+	do_fixup_by_path_u32(blob, cpu_path,
+		"timebase-frequency", OF_TBCLK, 1);
+	do_fixup_by_path_u32(blob, cpu_path,
+		"bus-frequency", bd->bi_busfreq, 1);
+	do_fixup_by_path_u32(blob, cpu_path,
+		"clock-frequency", bd->bi_intfreq, 1);
+	/*
+	 * fixup soc clocks using compatible
+	 */
+	do_fixup_by_compat_u32(blob, OF_SOC_COMPAT,
+		"bus-frequency", bd->bi_ipsfreq, 1);
+}
+
+void ft_cpu_setup(void *blob, bd_t *bd)
+{
+#ifdef CONFIG_OF_SUPPORT_OLD_DEVICE_TREES
+	old_ft_cpu_setup(blob, bd);
+#endif
+	ft_clock_setup(blob, bd);
+#ifdef CONFIG_HAS_ETH0
+	fdt_fixup_ethernet(blob, bd);
+#endif
 }
 #endif

include/configs/ads5121.h

@@ -308,6 +308,7 @@
 #define CONFIG_PHY_ADDR		0x1
 #define CONFIG_MII		1	/* MII PHY management		*/
 #define CONFIG_FEC_AN_TIMEOUT	1
+#define CONFIG_HAS_ETH0
 
 /*
  * Configure on-board RTC
@@ -478,10 +479,10 @@
 
 #define CONFIG_OF_LIBFDT	1
 #define CONFIG_OF_BOARD_SETUP	1
+#define CONFIG_OF_SUPPORT_OLD_DEVICE_TREES	1
 
 #define OF_CPU			"PowerPC,5121@0"
-#define OF_SOC			"soc@80000000"
-#define OF_SOC_OLD		"soc5121@80000000"
+#define OF_SOC_COMPAT		"fsl,mpc5121-immr"
 #define OF_TBCLK		(bd->bi_busfreq / 4)
 #define OF_STDOUT_PATH		"/soc@80000000/serial@11300"