[U-Boot] [PATCH] ARMV7: Overo: Automatically set clock rate to maximum if mpurate env variable is "auto"

[Steve Sakoman <steve@sakoman.com>]

The maximum clock rate for the OMAP3 processors on Overo depends on the
processor type and revision.  This patch sets the clock rate to the
spec sheet maximum if the mpurate environment variable is set to
"auto".  Otherwise it passes the mpurate variable unchanged on the
kernel command line.

Signed-off-by: Steve Sakoman <steve.sakoman@linaro.org>
---

diff --git a/board/overo/overo.c b/board/overo/overo.c
index f917e40..3c9e4a6 100644
--- a/board/overo/overo.c
+++ b/board/overo/overo.c
@@ -281,6 +281,22 @@ int misc_init_r(void)
 
 	dieid_num_r();
 
+	if (strcmp(getenv("mpurate"), "auto") == 0)
+		switch (get_cpu_family()) {
+		case CPU_OMAP34XX:
+			if ((get_cpu_rev() >= CPU_3XX_ES31) &&
+			    (get_sku_id() == SKUID_CLK_720MHZ))
+				setenv("mpurate", "720");
+			else
+				setenv("mpurate", "600");
+			break;
+		case CPU_OMAP36XX:
+			setenv("mpurate", "720");
+			break;
+		default:
+			setenv("mpurate", "500");
+		}
+
 	return 0;
 }
 
diff --git a/include/configs/omap3_overo.h b/include/configs/omap3_overo.h
index 79a5b85..dbdfd9a 100644
--- a/include/configs/omap3_overo.h
+++ b/include/configs/omap3_overo.h
@@ -156,7 +156,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"loadaddr=0x82000000\0" \
 	"console=ttyS2,115200n8\0" \
-	"mpurate=500\0" \
+	"mpurate=auto\0" \
 	"vram=12M\0" \
 	"dvimode=1024x768MR-16 at 60\0" \
 	"defaultdisplay=dvi\0" \