ARM: shmobile: r8a7779: add each clocks ratio on comment area

Adding comment describing the r8a7779 clock frequencies depending on
MD pin settings.

Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/clock-r8a7779.c b/arch/arm/mach-shmobile/clock-r8a7779.c
index 7d86bfbb5b06..5436b512da7a 100644
--- a/arch/arm/mach-shmobile/clock-r8a7779.c
+++ b/arch/arm/mach-shmobile/clock-r8a7779.c
@@ -26,6 +26,25 @@
 #include <mach/clock.h>
 #include <mach/common.h>
 
+/*
+ *              MD1 = 1                 MD1 = 0
+ *              (PLLA = 1500)           (PLLA = 1600)
+ *              (MHz)                   (MHz)
+ *------------------------------------------------+--------------------
+ * clkz         1000   (2/3)            800   (1/2)
+ * clkzs         250   (1/6)            200   (1/8)
+ * clki          750   (1/2)            800   (1/2)
+ * clks          250   (1/6)            200   (1/8)
+ * clks1         125   (1/12)           100   (1/16)
+ * clks3         187.5 (1/8)            200   (1/8)
+ * clks4          93.7 (1/16)           100   (1/16)
+ * clkp           62.5 (1/24)            50   (1/32)
+ * clkg           62.5 (1/24)            66.6 (1/24)
+ * clkb, CLKOUT
+ * (MD2 = 0)      62.5 (1/24)            66.6 (1/24)
+ * (MD2 = 1)      41.6 (1/36)            50   (1/32)
+*/
+
 #define MD(nr)  BIT(nr)
 
 #define FRQMR           IOMEM(0xffc80014)