ARM: clk-imx6sl: refine clock tree for SSI

Each SSI has "ssi", "ssi_ipg" clocks, and they share same gate bits.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
diff --git a/include/dt-bindings/clock/imx6sl-clock.h b/include/dt-bindings/clock/imx6sl-clock.h
index f10a928..9ce4e42 100644
--- a/include/dt-bindings/clock/imx6sl-clock.h
+++ b/include/dt-bindings/clock/imx6sl-clock.h
@@ -171,6 +171,9 @@
 #define IMX6SL_PLL5_BYPASS		158
 #define IMX6SL_PLL6_BYPASS		159
 #define IMX6SL_PLL7_BYPASS		160
-#define IMX6SL_CLK_END			161
+#define IMX6SL_CLK_SSI1_IPG		161
+#define IMX6SL_CLK_SSI2_IPG		162
+#define IMX6SL_CLK_SSI3_IPG		163
+#define IMX6SL_CLK_END			164
 
 #endif /* __DT_BINDINGS_CLOCK_IMX6SL_H */