ARM: STi: DT: Add STiH407 family tsin5 pinctrl configuration

tsin5 can only be configured for serial data transfer. However
depending on board design, two alternate tsin5 pin configurations
are available, both in pin-controller-front0.

pinctrl_tsin5_serial_alt1 is brought out on B2120 reference
design as TSD on NIMB slot of the B2004A daughter board.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih407-pinctrl.dtsi

@@ -547,6 +547,27 @@ st,pins {
 					};
 				};
 			};
+
+			tsin5 {
+				pinctrl_tsin5_serial_alt1: tsin5_serial_alt1 {
+					st,pins {
+						DATA7 = <&pio18 4 ALT1 IN SE_NICLK_IO 0 CLK_A>;
+						CLKIN = <&pio18 3 ALT1 IN CLKNOTDATA 0 CLK_A>;
+						VALID = <&pio18 1 ALT1 IN SE_NICLK_IO 0 CLK_A>;
+						ERROR = <&pio18 0 ALT1 IN SE_NICLK_IO 0 CLK_A>;
+						PKCLK = <&pio18 2 ALT1 IN SE_NICLK_IO 0 CLK_A>;
+					};
+				};
+				pinctrl_tsin5_serial_alt2: tsin5_serial_alt2 {
+					st,pins {
+						DATA7 = <&pio19 4 ALT2 IN SE_NICLK_IO 0 CLK_A>;
+						CLKIN = <&pio19 3 ALT2 IN CLKNOTDATA 0 CLK_A>;
+						VALID = <&pio19 1 ALT2 IN SE_NICLK_IO 0 CLK_A>;
+						ERROR = <&pio19 0 ALT2 IN SE_NICLK_IO 0 CLK_A>;
+						PKCLK = <&pio19 2 ALT2 IN SE_NICLK_IO 0 CLK_A>;
+					};
+				};
+			};
 		};
 
 		pin-controller-front1 {